Adv Mater 2022 Jan 17:e2109348. Epub 2022 Jan 17.
School of Polymer Science and Polymer Engineering, College of Engineering and Polymer Science, The University of Akron, Akron, Ohio, 44325, USA.
Perovskite solar cells in which two-dimensional (2D) perovskites are incorporated within a three-dimensional (3D) perovskite network exhibit improved stability with respect to purely 3D systems, but lower record power conversion efficiencies (PCEs). Here, we report a breakthrough in achieving enhanced PCEs, increased stability, and suppressed photocurrent hysteresis by incorporating n-type, low optical gap conjugated organic molecules into 2D:3D mixed perovskite composites. The resulting ternary perovskite-organic composites display extended absorption in the near-infrared region, improved film morphology, enlarged crystallinity, balanced charge transport, efficient photo-induced charge transfer, and suppressed counter-ion movement. Read More