56 results match your criteria Acs Energy Letters[Journal]


Recent Advances in Solar-Driven Carbon Dioxide Conversion: Expectations versus Reality.

ACS Energy Lett 2020 Jun 15;5(6):1996-2014. Epub 2020 May 15.

Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Aradi Square 1, Szeged H-6720, Hungary.

Solar-driven carbon dioxide (CO) conversion to fuels and high-value chemicals can contribute to the better utilization of renewable energy sources. Photosynthetic (PS), photocatalytic (PC), photoelectrochemical (PEC), and photovoltaic plus electrochemical (PV+EC) approaches are intensively studied strategies. We aimed to compare the performance of these approaches using unified metrics and to highlight representative studies with outstanding performance in a given aspect. Read More

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http://dx.doi.org/10.1021/acsenergylett.0c00645DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7296618PMC

Stable Hexylphosphonate-Capped Blue-Emitting Quantum-Confined CsPbBr Nanoplatelets.

ACS Energy Lett 2020 Jun 15;5(6):1900-1907. Epub 2020 May 15.

Cavendish Laboratory, University of Cambridge, 19 JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

Quantum-confined CsPbBr nanoplatelets (NPLs) are extremely promising for use in low-cost blue light-emitting diodes, but their tendency to coalesce in both solution and film form, particularly under operating device conditions with injected charge-carriers, is hindering their adoption. We show that employing a short hexyl-phosphonate ligand (CHOP) in a heat-up colloidal approach for pure, blue-emitting quantum-confined CsPbBr NPLs significantly suppresses these coalescence phenomena compared to particles capped with the typical oleyammonium ligands. The phosphonate-passivated NPL thin films exhibit photoluminescence quantum yields of ∼40% at 450 nm with exceptional ambient and thermal stability. Read More

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http://dx.doi.org/10.1021/acsenergylett.0c00935DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7296617PMC

Revealing the Active Phase of Copper during the Electroreduction of CO in Aqueous Electrolyte by Correlating X-ray Spectroscopy and Electron Microscopy.

ACS Energy Lett 2020 Jun 27;5(6):2106-2111. Epub 2020 May 27.

Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr 45470, Germany.

The variation in the morphology and electronic structure of copper during the electroreduction of CO into valuable hydrocarbons and alcohols was revealed by combining surface- and bulk-sensitive X-ray spectroscopies with electrochemical scanning electron microscopy. These experiments proved that the electrified interface surface and near-surface are dominated by reduced copper. The selectivity to the formation of the key C-C bond is enhanced at higher cathodic potentials as a consequence of increased copper metallicity. Read More

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http://dx.doi.org/10.1021/acsenergylett.0c00802DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7296532PMC

COVID-19, Climate Change, and Renewable Energy Research: We Are All in This Together, and the Time to Act Is Now.

Authors:
Song Jin

ACS Energy Lett 2020 May;5(5):1709-1711

Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.

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http://dx.doi.org/10.1021/acsenergylett.0c00910DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7228427PMC

Nonradiative Energy Transfer between Thickness-Controlled Halide Perovskite Nanoplatelets.

ACS Energy Lett 2020 May 1;5(5):1380-1385. Epub 2020 Apr 1.

Nanospectroscopy Group and Center for Nanoscience (CeNS), Nano-Institute Munich, Department of Physics, Ludwig-Maximilians-Universität München, Königinstr. 10, 80539 Munich, Germany.

Despite showing great promise for optoelectronics, the commercialization of halide perovskite nanostructure-based devices is hampered by inefficient electrical excitation and strong exciton binding energies. While transport of excitons in an energy-tailored system via Förster resonance energy transfer (FRET) could be an efficient alternative, halide ion migration makes the realization of cascaded structures difficult. Here, we show how these could be obtained by exploiting the pronounced quantum confinement effect in two-dimensional CsPbBr-based nanoplatelets (NPls). Read More

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http://dx.doi.org/10.1021/acsenergylett.0c00471DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7216487PMC

Effects of Atmospheric Gases on Li Metal Cyclability and Solid-Electrolyte Interphase Formation.

ACS Energy Lett 2020 Apr 10;5(4):1088-1094. Epub 2020 Mar 10.

Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.

For Li-air batteries, dissolved gas can cross over from the air electrode to the Li metal anode and affect the solid-electrolyte interphase (SEI) formation, a phenomenon that has not been fully characterized. In this work, the impact of atmospheric gases on the SEI properties is studied using electrochemical methods and ex situ characterization techniques, including X-ray photoelectron spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The presence of O significantly improved the lithium cyclability; less lithium is consumed to form the SEI or is lost because of electrical disconnects. Read More

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http://dx.doi.org/10.1021/acsenergylett.0c00257DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7155172PMC

Control over Crystal Size in Vapor Deposited Metal-Halide Perovskite Films.

ACS Energy Lett 2020 Mar 4;5(3):710-717. Epub 2020 Feb 4.

Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom.

Understanding and controlling grain growth in metal halide perovskite polycrystalline thin films is an important step in improving the performance of perovskite solar cells. We demonstrate accurate control of crystallite size in CHNHPbI thin films by regulating substrate temperature during vacuum co-deposition of inorganic (PbI) and organic (CHNHI) precursors. Films co-deposited onto a cold (-2 °C) substrate exhibited large, micrometer-sized crystal grains, while films that formed at room temperature (23 °C) only produced grains of 100 nm extent. Read More

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http://dx.doi.org/10.1021/acsenergylett.0c00183DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7147257PMC

Visualizing Buried Local Carrier Diffusion in Halide Perovskite Crystals via Two-Photon Microscopy.

ACS Energy Lett 2020 Jan 27;5(1):117-123. Epub 2019 Nov 27.

Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

Halide perovskites have shown great potential for light emission and photovoltaic applications due to their remarkable electronic properties. Although the device performances are promising, they are still limited by microscale heterogeneities in their photophysical properties. Here, we study the impact of these heterogeneities on the diffusion of charge carriers, which are processes crucial for efficient collection of charges in light-harvesting devices. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b02244DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7009023PMC
January 2020

Toward Improved Environmental Stability of Polymer:Fullerene and Polymer:Nonfullerene Organic Solar Cells: A Common Energetic Origin of Light- and Oxygen-Induced Degradation.

ACS Energy Lett 2019 Apr 12;4(4):846-852. Epub 2019 Mar 12.

School of Engineering, Cardiff University, Newport Road, Cardiff CF24 3AA, United Kingdom.

With the emergence of nonfullerene electron acceptors resulting in further breakthroughs in the performance of organic solar cells, there is now an urgent need to understand their degradation mechanisms in order to improve their intrinsic stability through better material design. In this study, we present quantitative evidence for a common root cause of light-induced degradation of polymer:nonfullerene and polymer:fullerene organic solar cells in air, namely, a fast photo-oxidation process of the photoactive materials mediated by the formation of superoxide radical ions, whose yield is found to be strongly controlled by the lowest unoccupied molecular orbital (LUMO) levels of the electron acceptors used. Our results elucidate the general relevance of this degradation mechanism to both polymer:fullerene and polymer:nonfullerene blends and highlight the necessity of designing electron acceptor materials with sufficient electron affinities to overcome this challenge, thereby paving the way toward achieving long-term solar cell stability with minimal device encapsulation. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b00109DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7006362PMC

Integration of a Hydrogenase in a Lead Halide Perovskite Photoelectrode for Tandem Solar Water Splitting.

ACS Energy Lett 2020 Jan 10;5(1):232-237. Epub 2019 Dec 10.

Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.

Lead halide perovskite solar cells are notoriously moisture-sensitive, but recent encapsulation strategies have demonstrated their potential application as photoelectrodes in aqueous solution. However, perovskite photoelectrodes rely on precious metal co-catalysts, and their combination with biological materials remains elusive in integrated devices. Here, we interface [NiFeSe] hydrogenase from Hildenborough, a highly active enzyme for H generation, with a triple cation mixed halide perovskite. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b02437DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6986817PMC
January 2020

Solid-State Infrared Upconversion in Perylene Diimides Followed by Direct Electron Injection.

ACS Energy Lett 2020 Jan 5;5(1):124-129. Epub 2019 Dec 5.

Optoelectronic Materials Section, Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.

In this contribution we demonstrate a solid-state approach to triplet-triplet annihilation upconversion for application in a solar cell device in which absorption of near-infrared light is followed by direct electron injection into an inorganic substrate. We use time-resolved microwave photoconductivity experiments to study the injection of electrons into the electron-accepting substrate (TiO) in a trilayer device consisting of a triplet sensitizer (fluorinated zinc phthalocyanine), triplet acceptor (methyl subsituted perylenediimide), and smooth polycrystalline TiO. Absorption of light at 700 nm leads to the almost quantitative generation of triplet excited states by intersystem crossing. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b02361DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6958839PMC
January 2020

Transition Metal Chalcogenide Single Layers as an Active Platform for Single-Atom Catalysis.

ACS Energy Lett 2019 Aug 9;4(8):1947-1953. Epub 2019 Jul 9.

Institute of Technical Physics and Materials Science, Hungarian Academy of Sciences, Centre for Energy Research, 1121 Budapest, Hungary.

Among the main appeals of single-atom catalysts are the ultimate efficiency of material utilization and the well-defined nature of the active sites, holding the promise of rational catalyst design. A major challenge is the stable decoration of various substrates with a high density of individually dispersed and uniformly active monatomic sites. Transition metal chalcogenides (TMCs) are broadly investigated catalysts, limited by the relative inertness of their pristine basal plane. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b01097DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6866691PMC

Direct Synthesis of Quaternary Alkylammonium-Capped Perovskite Nanocrystals for Efficient Blue and Green Light-Emitting Diodes.

ACS Energy Lett 2019 Nov 11;4(11):2703-2711. Epub 2019 Oct 11.

Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.

Cesium lead halide nanocrystals (CsPbX NCs) are new inorganic light sources covering the entire visible spectral range and exhibiting near-unity efficiencies. While the last years have seen rapid progress in green and red electroluminescence from CsPbX NCs, the development of blue counterparts remained rather stagnant. Controlling the surface state of CsPbX NCs had proven to be a major factor governing the efficiency of the charge injection and for diminishing the density of traps. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b01915DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6849336PMC
November 2019

Surface Photovoltage-Induced Ultralow Work Function Material for Thermionic Energy Converters.

ACS Energy Lett 2019 Oct 24;4(10):2436-2443. Epub 2019 Jul 24.

Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States.

Low work function materials are essential for efficient thermionic energy converters (TECs), electronics, and electron emission devices. Much effort has been put into finding thermally stable material combinations that exhibit low work functions. Submonolayer coatings of alkali metals have proven to significantly reduce the work function; however, a work function less than 1 eV has not been reached. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b01214DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6792473PMC
October 2019

Reversible Removal of Intermixed Shallow States by Light Soaking in Multication Mixed Halide Perovskite Films.

ACS Energy Lett 2019 Oct 5;4(10):2360-2367. Epub 2019 Sep 5.

Department of Chemical Engineering, Delft University of Technology, 2629 HZ Delft, The Netherlands.

The highest reported efficiencies of metal halide perovskite (MHP) solar cells are all based on mixed perovskites, such as (FA,MA,Cs)Pb(I Br ). Despite demonstrated structural changes induced by light soaking, it is unclear how the charge carrier dynamics are affected across this entire material family. Here, various (FA,MA,Cs)Pb(I Br ) perovskite films are light-soaked in nitrogen, and changes in optoelectronic properties are investigated through time-resolved microwave conductivity (TRMC) and optical and structural techniques. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b01726DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6792222PMC
October 2019

Microsecond Carrier Lifetimes, Controlled p-Doping, and Enhanced Air Stability in Low-Bandgap Metal Halide Perovskites.

ACS Energy Lett 2019 Sep 21;4(9):2301-2307. Epub 2019 Aug 21.

Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.

Mixed lead-tin halide perovskites have sufficiently low bandgaps (∼1.2 eV) to be promising absorbers for perovskite-perovskite tandem solar cells. Previous reports on lead-tin perovskites have typically shown poor optoelectronic properties compared to neat lead counterparts: short photoluminescence lifetimes (<100 ns) and low photoluminescence quantum efficiencies (<1%). Read More

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http://dx.doi.org/10.1021/acsenergylett.9b01446DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6748266PMC
September 2019

In Situ Modification of a Delafossite-Type PdCoO Bulk Single Crystal for Reversible Hydrogen Sorption and Fast Hydrogen Evolution.

ACS Energy Lett 2019 Sep 15;4(9):2185-2191. Epub 2019 Aug 15.

Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.

The observation of extraordinarily high conductivity in delafossite-type PdCoO is of great current interest, and there is some evidence that electrons behave like a fluid when flowing in bulk crystals of PdCoO. Thus, this material is an ideal platform for the study of the electron transfer processes in heterogeneous reactions. Here, we report the use of bulk single-crystal PdCoO as a promising electrocatalyst for hydrogen evolution reactions (HERs). Read More

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http://dx.doi.org/10.1021/acsenergylett.9b01527DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6747882PMC
September 2019

Multilayer Electrolyzer Stack Converts Carbon Dioxide to Gas Products at High Pressure with High Efficiency.

ACS Energy Lett 2019 Jul 27;4(7):1770-1777. Epub 2019 Jun 27.

Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary.

Electrochemical reduction of CO is a value-added approach to both decrease the atmospheric emission of carbon dioxide and form valuable chemicals. We present a zero gap electrolyzer cell, which continuously converts gas phase CO to products without using any liquid catholyte. This is the first report of a multilayer CO electrolyzer stack for scaling up the electrolysis process. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b01142DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6632018PMC

Unraveling the Role of Lithium in Enhancing the Hydrogen Evolution Activity of MoS: Intercalation versus Adsorption.

ACS Energy Lett 2019 Jul 27;4(7):1733-1740. Epub 2019 Jun 27.

Laboratory for Inorganic Materials and Catalysis, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Molybdenum disulfide (MoS) is a highly promising catalyst for the hydrogen evolution reaction (HER) to realize large-scale artificial photosynthesis. The metallic 1T'-MoS phase, which is stabilized via the adsorption or intercalation of small molecules or cations such as Li, shows exceptionally high HER activity, comparable to that of noble metals, but the effect of cation adsorption on HER performance has not yet been resolved. Here we investigate in detail the effect of Li adsorption and intercalation on the proton reduction properties of MoS. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b00945DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6630958PMC
July 2019
1 Read

Shape-Controlled Nanoparticles as Anodic Catalysts in Low-Temperature Fuel Cells.

ACS Energy Lett 2019 Jun 15;4(6):1484-1495. Epub 2019 May 15.

Fritz-Haber Institute of the Max-Planck Society, D-14195 Berlin, Germany.

The great dependence of the electrocatalytic activity of most electrochemical reactions on the catalytic surface area and specific surface structure is widely accepted. Building on the extensive knowledge already available on single-crystal surfaces, this Perspective discusses the recent progress made in low-temperature fuel cells through the use of the most active shape-controlled noble metal-based nanoparticles. In particular, we will focus on discussing structure-composition-reactivity correlations in methanol, ethanol, and formic acid oxidation reactions and will offer a general vision of future needs. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b00565DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6591768PMC
June 2019
3 Reads

Identifying and Reducing Interfacial Losses to Enhance Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet Light-Emitting Diodes.

ACS Energy Lett 2019 May 17;4(5):1181-1188. Epub 2019 Apr 17.

Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, U.K.

Perovskite nanoplatelets (NPls) hold promise for light-emitting applications, having achieved photoluminescence quantum efficiencies approaching unity in the blue wavelength range, where other metal-halide perovskites have typically been ineffective. However, the external quantum efficiencies (EQEs) of blue-emitting NPl light-emitting diodes (LEDs) have reached only 0.12%. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b00571DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6516044PMC
May 2019
28 Reads

Tuning the Excited-State Dynamics of CuI Films with Electrochemical Bias.

ACS Energy Lett 2019 Mar 13;4(3):702-708. Epub 2019 Feb 13.

Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States.

Owing to its high hole conductivity and ease of preparation, CuI was among the first inorganic hole-transporting materials that were introduced early on in metal halide perovskite solar cells, but its full potential as a semiconductor material is still to be realized. We have now performed ultrafast spectroelectrochemical experiments on ITO/CuI electrodes to show the effect of applied bias on the excited-state dynamics in CuI. Under operating conditions, the recombination of excitons is dependent on the applied bias, and it can be accelerated by decreasing the potential from +0. Read More

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http://dx.doi.org/10.1021/acsenergylett.9b00182DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6413481PMC
March 2019
7 Reads

Introductory Guide to Assembling and Operating Gas Diffusion Electrodes for Electrochemical CO Reduction.

ACS Energy Lett 2019 Mar 11;4(3):639-643. Epub 2019 Feb 11.

Materials for Energy Conversion and Storage, Department of Chemical Engineering, Delft University of Technology, 2629 HZ Delft, The Netherlands.

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http://dx.doi.org/10.1021/acsenergylett.9b00137DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6413482PMC
March 2019
2 Reads

Renewable Hydrogen and Electricity Dispatch with Multiple Ni-Fe Electrode Storage.

ACS Energy Lett 2019 Feb 30;4(2):567-571. Epub 2019 Jan 30.

Materials for Energy Conversion and Storage (MECS), Delft University of Technology, 2629 HZ Delft, Netherlands.

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http://dx.doi.org/10.1021/acsenergylett.8b02488DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6373986PMC
February 2019
2 Reads

Potassium- and Rubidium-Passivated Alloyed Perovskite Films: Optoelectronic Properties and Moisture Stability.

ACS Energy Lett 2018 Nov 28;3(11):2671-2678. Epub 2018 Sep 28.

Cavendish Laboratory, Department of Physics, University of Cambridge, Cambridge CB3 0HE, United Kingdom.

Halide perovskites passivated with potassium or rubidium show superior photovoltaic device performance compared to unpassivated samples. However, it is unclear which passivation route is more effective for film stability. Here, we directly compare the optoelectronic properties and stability of thin films when passivating triple-cation perovskite films with potassium or rubidium species. Read More

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http://dx.doi.org/10.1021/acsenergylett.8b01504DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6344034PMC
November 2018
5 Reads

Rationalizing and Controlling the Surface Structure and Electronic Passivation of Cesium Lead Halide Nanocrystals.

ACS Energy Lett 2019 Jan 27;4(1):63-74. Epub 2018 Nov 27.

Department of Theoretical Chemistry, Faculty of Science, Vrije Universiteit Amsterdam, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands.

Colloidal lead halide perovskite nanocrystals (NCs) have recently emerged as versatile photonic sources. Their processing and luminescent properties are challenged by the lability of their surfaces, i.e. Read More

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http://pubs.acs.org/doi/10.1021/acsenergylett.8b01669
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http://dx.doi.org/10.1021/acsenergylett.8b01669DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6333230PMC
January 2019
25 Reads

Controlling the Phase Segregation in Mixed Halide Perovskites through Nanocrystal Size.

ACS Energy Lett 2019 Jan 27;4(1):54-62. Epub 2018 Nov 27.

Institute of Advanced Materials (INAM), University Jaume I, Avenida de Vicent Sos Baynat, s/n, 12006 Castelló de la Plana, Castellón, Spain.

Mixed halide perovskites are one of the promising candidates in developing solar cells and light-emitting diodes (LEDs), among other applications, because of their tunable optical properties. Nonetheless, photoinduced phase segregation, by formation of segregated Br-rich and I-rich domains, limits the overall applicability. We tracked the phase segregation with increasing crystalline size of CsPbBr I and their photoluminescence under continuous-wave laser irradiation (405 nm, 10 mW cm) and observed the occurrence of the phase segregation from the threshold size of 46 ± 7 nm. Read More

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http://dx.doi.org/10.1021/acsenergylett.8b02207DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6333216PMC
January 2019
4 Reads

Spontaneous Silver Doping and Surface Passivation of CsPbI Perovskite Active Layer Enable Light-Emitting Devices with an External Quantum Efficiency of 11.2.

ACS Energy Lett 2018 Jul 13;3(7):1571-1577. Epub 2018 Jun 13.

Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR.

Lead halide perovskite nanocrystals are currently under intense investigation as components of solution-processed light-emitting devices (LEDs). We demonstrate LEDs based on Ag doped-passivated CsPbI perovskite nanocrystals with external quantum efficiency of 11.2% and an improved stability. Read More

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http://pubs.acs.org/doi/10.1021/acsenergylett.8b00835
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http://dx.doi.org/10.1021/acsenergylett.8b00835DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6269143PMC
July 2018
56 Reads

Ultrafast Intraband Spectroscopy of Hot-Carrier Cooling in Lead-Halide Perovskites.

ACS Energy Lett 2018 Sep 21;3(9):2199-2205. Epub 2018 Aug 21.

Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom.

The rapid relaxation of above-band-gap "hot" carriers (HCs) imposes the key efficiency limit in lead-halide perovskite (LHP) solar cells. Recent studies have indicated that HC cooling in these systems may be sensitive to materials composition, as well as the energy and density of excited states. However, the key parameters underpinning the cooling mechanism are currently under debate. Read More

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http://pubs.acs.org/doi/10.1021/acsenergylett.8b01227
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http://dx.doi.org/10.1021/acsenergylett.8b01227DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6231231PMC
September 2018
58 Reads

The Potential of Singlet Fission Photon Multipliers as an Alternative to Silicon-Based Tandem Solar Cells.

ACS Energy Lett 2018 Oct 26;3(10):2587-2592. Epub 2018 Sep 26.

Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.

Singlet fission, an exciton multiplication process in organic semiconductors that converts one singlet exciton into two triplet excitons, is a promising way to reduce thermalization losses in conventional solar cells. One way to harvest triplet excitons is to transfer their energy into quantum dots, which then emit photons into an underlying solar cell. We simulate the performance potential of such a singlet fission photon multiplier combined with a silicon base cell and compare it to a silicon-based tandem solar cell. Read More

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http://pubs.acs.org/doi/10.1021/acsenergylett.8b01322
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http://dx.doi.org/10.1021/acsenergylett.8b01322DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6189909PMC
October 2018
7 Reads

Thermally Activated Second-Order Recombination Hints toward Indirect Recombination in Fully Inorganic CsPbI Perovskites.

ACS Energy Lett 2018 Sep 18;3(9):2068-2069. Epub 2018 Jul 18.

Department of Chemical Engineering, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands.

The relationship between the dipole moment of the methylammonium cation and the optoelectronic properties of lead halide perovskites remains under debate. We show that both the temperature-dependent charge carrier mobility and recombination kinetics are identical for methylammonium and cesium lead iodide, indicating that the role of the monovalent cation is subordinate to the lead iodide framework. From the observation that for both perovskites the electron-hole recombination is thermally activated, we speculate that the bandgap is slightly indirect. Read More

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http://dx.doi.org/10.1021/acsenergylett.8b01106DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6142047PMC
September 2018
6 Reads

Evaluating the Stability of CoP Electrocatalysts in the Hydrogen Evolution Reaction for Both Acidic and Alkaline Electrolytes.

ACS Energy Lett 2018 Jun 16;3(6):1360-1365. Epub 2018 May 16.

Laboratory of Inorganic Materials Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands.

The evaluation of the stability of emerging earth-abundant metal phosphide electrocatalysts by solely electrochemical current-potential sweeps is often not conclusive. In this study, we investigated CoP to evaluate its stability under both acidic (0.5 M HSO) and alkaline (1. Read More

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http://pubs.acs.org/doi/10.1021/acsenergylett.8b00514
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http://dx.doi.org/10.1021/acsenergylett.8b00514DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5996345PMC
June 2018
4 Reads

In Situ Fabrication and Reactivation of Highly Selective and Stable Ag Catalysts for Electrochemical CO Conversion.

ACS Energy Lett 2018 Jun 8;3(6):1301-1306. Epub 2018 May 8.

Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands.

In this work, the highly selective and stable electrocatalytic reduction of CO to CO on nanostructured Ag electrocatalysts is presented. The Ag electrocatalysts are synthesized by the electroreduction of AgCO formed by in situ anodic-etching of Ag foil in a KHCO electrolyte. After 3 min of this etching treatment, the AgCO-derived nanostructured Ag electrocatalysts are capable of producing CO with up to 92% Faradaic efficiency at an overpotential as low as 290 mV, which surpasses all of the reported Ag catalysts at identical conditions to date. Read More

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http://dx.doi.org/10.1021/acsenergylett.8b00472DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5996346PMC
June 2018
16 Reads

Efficient and Stable Silicon Microwire Photocathodes with a Nickel Silicide Interlayer for Operation in Strongly Alkaline Solutions.

ACS Energy Lett 2018 May 9;3(5):1086-1092. Epub 2018 Apr 9.

Molecular NanoFabrication, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Most photoanodes commonly applied in solar fuel research (e.g., of FeO, BiVO, TiO, or WO) are only active and stable in alkaline electrolytes. Read More

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http://dx.doi.org/10.1021/acsenergylett.8b00267DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5952259PMC
May 2018
13 Reads

Balancing Charge Carrier Transport in a Quantum Dot P-N Junction toward Hysteresis-Free High-Performance Solar Cells.

ACS Energy Lett 2018 Apr 3;3(4):1036-1043. Epub 2018 Apr 3.

Department of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, United Kingdom.

In a quantum dot solar cell (QDSC) that has an inverted structure, the QD layers form two different junctions between the electron transport layer (ETL) and the other semiconducting QD layer. Recent work on an inverted-structure QDSC has revealed that the junction between the QD layers is the dominant junction, rather than the junction between the ETL and the QD layers, which is in contrast to the conventional wisdom. However, to date, there have been a lack of systematic studies on the role and importance of the QD heterojunction structure on the behavior of the solar cell and the resulting device performance. Read More

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http://dx.doi.org/10.1021/acsenergylett.8b00130DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5951602PMC
April 2018
30 Reads

Electrochemical Reduction of Carbon Dioxide on Nitrogen-Doped Carbons: Insights from Isotopic Labeling Studies.

ACS Energy Lett 2018 Mar 19;3(3):722-723. Epub 2018 Feb 19.

Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary.

Isotopic labeling experiments were performed to better understand the electrochemical reduction of carbon dioxide on nitrogen-doped porous carbon electrodes. By using nonequilibrated solutions of selectively labeled initial carbon sources (i.e. Read More

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http://dx.doi.org/10.1021/acsenergylett.8b00212DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5848144PMC
March 2018
3 Reads

Colloidal CsPbX (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability.

ACS Energy Lett 2018 Mar 9;3(3):641-646. Epub 2018 Feb 9.

Institute of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zürich, Vladimir Prelog Weg 1, CH-8093 Zürich, Switzerland.

Colloidal lead halide perovskite nanocrystals (NCs) have recently emerged as versatile photonic sources. Their processing and optoelectronic applications are hampered by the loss of colloidal stability and structural integrity due to the facile desorption of surface capping molecules during isolation and purification. To address this issue, herein, we propose a new ligand capping strategy utilizing common and inexpensive long-chain zwitterionic molecules such as 3-(,-dimethyloctadecylammonio)propanesulfonate, resulting in much improved chemical durability. Read More

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http://dx.doi.org/10.1021/acsenergylett.8b00035DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5848145PMC
March 2018
50 Reads

H Evolution with Covalent Organic Framework Photocatalysts.

ACS Energy Lett 2018 Feb 5;3(2):400-409. Epub 2018 Jan 5.

Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany.

Covalent organic frameworks (COFs) are a new class of crystalline organic polymers that have garnered significant recent attention as highly promising H evolution photocatalysts. This Perspective discusses the advances in this field of energy research while highlighting the underlying peremptory factors for the rational design of readily tunable COF photoabsorber-cocatalyst systems for optimal photocatalytic performance. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b01123DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5809981PMC
February 2018
3 Reads

Enhanced n-Doping Efficiency of a Naphthalenediimide-Based Copolymer through Polar Side Chains for Organic Thermoelectrics.

ACS Energy Lett 2018 Feb 5;3(2):278-285. Epub 2018 Jan 5.

Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 412 96 Göteborg, Sweden.

N-doping of conjugated polymers either requires a high dopant fraction or yields a low electrical conductivity because of their poor compatibility with molecular dopants. We explore n-doping of the polar naphthalenediimide-bithiophene copolymer p(gNDI-gT2) that carries oligoethylene glycol-based side chains and show that the polymer displays superior miscibility with the benzimidazole-dimethylbenzenamine-based n-dopant N-DMBI. The good compatibility of p(gNDI-gT2) and N-DMBI results in a relatively high doping efficiency of 13% for n-dopants, which leads to a high electrical conductivity of more than 10 S cm for a dopant concentration of only 10 mol % when measured in an inert atmosphere. Read More

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http://pubs.acs.org/doi/10.1021/acsenergylett.7b01146
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http://dx.doi.org/10.1021/acsenergylett.7b01146DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5809982PMC
February 2018
11 Reads

Postsynthesis Transformation of Insulating CsPbBr Nanocrystals into Bright Perovskite CsPbBr through Physical and Chemical Extraction of CsBr.

ACS Energy Lett 2017 Oct 19;2(10):2445-2448. Epub 2017 Sep 19.

Nanochemistry Department, and Materials Characterization Facility, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

Perovskite-related CsPbBr nanocrystals present a "zero-dimensional" crystalline structure where adjacent [PbBr] octahedra do not share any corners. We show in this work that these nanocrystals can be converted into "three-dimensional" CsPbBr perovskites by extraction of CsBr. This conversion drastically changes the optoelectronic properties of the nanocrystals that become highly photoluminescent. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00842DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5736241PMC
October 2017
11 Reads

Slow Cooling of Hot Polarons in Halide Perovskite Solar Cells.

ACS Energy Lett 2017 Dec 23;2(12):2647-2652. Epub 2017 Oct 23.

Department of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, United Kingdom.

Halide perovskites show unusual thermalization kinetics for above-bandgap photoexcitation. We explain this as a consequence of excess energy being deposited into discrete large polaron states. The crossover between low-fluence and high-fluence "phonon bottleneck" cooling is due to a Mott transition where the polarons overlap ( ≥ 10 cm) and the phonon subpopulations are shared. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00862DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5727468PMC
December 2017
12 Reads

Fluorescent Alloy CsPb Mn I Perovskite Nanocrystals with High Structural and Optical Stability.

ACS Energy Lett 2017 Sep 28;2(9):2183-2186. Epub 2017 Aug 28.

Nanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.

CsPbI nanocrystals are still limited in their use because of their phase instability as they degrade into the yellow nonemitting δ-CsPbI phase within a few days. We show that alloyed CsPb Mn I nanocrystals have essentially the same optical features and crystal structure as the parent α-CsPbI system, but they are stable in films and in solution for periods over a month. The stabilization stems from a small decrease in the lattice parameters slightly increasing the Goldsmith tolerance factor, combined with an increase in the cohesive energy. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00707DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5679661PMC
September 2017
22 Reads

Semi-Interpenetrating Polymer Networks for Enhanced Supercapacitor Electrodes.

ACS Energy Lett 2017 Sep 14;2(9):2014-2020. Epub 2017 Aug 14.

Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.

Conducting polymers show great promise as supercapacitor materials due to their high theoretical specific capacitance, low cost, toughness, and flexibility. Poor ion mobility, however, can render active material more than a few tens of nanometers from the surface inaccessible for charge storage, limiting performance. Here, we use semi-interpenetrating networks (sIPNs) of a pseudocapacitive polymer in an ionically conductive polymer matrix to decrease ion diffusion length scales and make virtually all of the active material accessible for charge storage. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00466DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5662927PMC
September 2017
30 Reads

Crystallographic Data Support the Carousel Mechanism of Water Supply to the Oxygen-Evolving Complex of Photosystem II.

ACS Energy Lett 2017 Oct 7;2(10):2299-2306. Epub 2017 Sep 7.

Department of Chemistry, Yale University, New Haven, Connecticut 06520-8107, United States.

Photosystem II (PSII) oxidizes water to produce oxygen through a four-step photocatalytic cycle. Understanding PSII structure-function relations is important for the development of biomimetic photocatalytic systems. The quantum mechanics/molecular mechanics (QM/MM) analysis of substrate water binding to the oxygen-evolving complex (OEC) has suggested a rearrangement of water ligands in a carousel mechanism around a key Mn center. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00750DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5644713PMC
October 2017
4 Reads

Doped Halide Perovskite Nanocrystals for Reabsorption-Free Luminescent Solar Concentrators.

ACS Energy Lett 2017 Oct 15;2(10):2368-2377. Epub 2017 Sep 15.

Dipartimento di Scienza dei Materiali, Università degli Studi di Milano Bicocca, via R. Cozzi 55, I-20125 Milano, Italy.

Halide perovskite nanocrystals (NCs) are promising solution-processed emitters for low-cost optoelectronics and photonics. Doping adds a degree of freedom for their design and enables us to fully decouple their absorption and emission functions. This is paramount for luminescent solar concentrators (LSCs) that enable fabrication of electrode-less solar windows for building-integrated photovoltaic applications. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00701DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6559125PMC
October 2017
15 Reads

Modeling the Performance Limitations and Prospects of Perovskite/Si Tandem Solar Cells under Realistic Operating Conditions.

ACS Energy Lett 2017 Sep 22;2(9):2089-2095. Epub 2017 Aug 22.

Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.

Perovskite/Si tandem solar cells have the potential to considerably out-perform conventional solar cells. Under standard test conditions, perovskite/Si tandem solar cells already outperform the Si single junction. Under realistic conditions, however, as we show, tandem solar cells made from current record cells are hardly more efficient than the Si cell alone. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00596DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5594440PMC
September 2017
15 Reads

Lead Halide Perovskite Nanocrystals in the Research Spotlight: Stability and Defect Tolerance.

ACS Energy Lett 2017 Sep 10;2(9):2071-2083. Epub 2017 Aug 10.

Department of Materials Science and Engineering and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon, Hong Kong SAR.

This Perspective outlines basic structural and optical properties of lead halide perovskite colloidal nanocrystals, highlighting differences and similarities between them and conventional II-VI and III-V semiconductor quantum dots. A detailed insight into two important issues inherent to lead halide perovskite nanocrystals then follows, namely, the advantages of defect tolerance and the necessity to improve their stability in environmental conditions. The defect tolerance of lead halide perovskites offers an impetus to search for similar attributes in other related heavy metal-free compounds. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00547DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5594444PMC
September 2017
34 Reads

Vapour-Deposited Cesium Lead Iodide Perovskites: Microsecond Charge Carrier Lifetimes and Enhanced Photovoltaic Performance.

ACS Energy Lett 2017 Aug 28;2(8):1901-1908. Epub 2017 Jul 28.

Department of Chemical Engineering, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands.

Metal halide perovskites such as methylammonium lead iodide (MAPbI) are highly promising materials for photovoltaics. However, the relationship between the organic nature of the cation and the optoelectronic quality remains debated. In this work, we investigate the optoelectronic properties of fully inorganic vapour-deposited and spin-coated black-phase CsPbI thin films. Read More

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http://pubs.acs.org/doi/10.1021/acsenergylett.7b00591
Publisher Site
http://dx.doi.org/10.1021/acsenergylett.7b00591DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5569666PMC
August 2017
6 Reads

Recombination in Perovskite Solar Cells: Significance of Grain Boundaries, Interface Traps, and Defect Ions.

ACS Energy Lett 2017 May 2;2(5):1214-1222. Epub 2017 May 2.

Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands.

Trap-assisted recombination, despite being lower as compared with traditional inorganic solar cells, is still the dominant recombination mechanism in perovskite solar cells (PSCs) and limits their efficiency. We investigate the attributes of the primary trap-assisted recombination channels (grain boundaries and interfaces) and their correlation to defect ions in PSCs. We achieve this by using a validated device model to fit the simulations to the experimental data of efficient vacuum-deposited p-i-n and n-i-p CHNHPbI solar cells, including the light intensity dependence of the open-circuit voltage and fill factor. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00236DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5438194PMC
May 2017
68 Reads

Protection and Reactivation of the [NiFeSe] Hydrogenase from Hildenborough under Oxidative Conditions.

ACS Energy Lett 2017 May 3;2(5):964-968. Epub 2017 Apr 3.

Analytical Chemistry - Center for Electrochemical Sciences (CES), Ruhr-Universität Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany.

We report on the fabrication of bioanodes for H oxidation based on [NiFeSe] hydrogenase. The enzyme was electrically wired by means of a specifically designed low-potential viologen-modified polymer, which delivers benchmark H oxidizing currents even under deactivating conditions owing to efficient protection against O combined with a viologen-induced reactivation of the O inhibited enzyme. Moreover, the viologen-modified polymer allows for electrochemical co-deposition of polymer and biocatalyst and, by this, for control of the film thickness. Read More

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http://dx.doi.org/10.1021/acsenergylett.7b00167DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7098691PMC