Optimizing Black Phosphorus/Halide Perovskite Compositions by Scanning Photoelectrochemical Microscopy

摘要

The incorporation of black phosphorus (BP) into methylammonium lead iodide (MAPbI(3)) perovskites has been investigated and optimized by a high throughput screening method using scanning photoelectrochemical microscopy (SPECM) to determine how the addition of BP affects its photoelectrochemical and photovoltaic properties. An optimum ratio of 2.0 mole% BP/MAPbI(3) perovskite composite generates an increased photocurrent response compared to pristine MAPbI(3) for 2 mM benzoquinone (BQ) reduction at -0.6 V vs Ag/AgNO3 on a spot array electrode under illumination. Due to the relatively high quantum yield of MAPbI(3), time-resolved photoluminescence measurements have been conducted to investigate photophysical behaviors of BP/MAPbI(3) composites. The optimal 2.0 mole% BP/MAPbI(3) exhibits an increased electron-hole diffusion lifetime compared to the pristine MAPbI(3) perovskite. Finally, we demonstrate the enhanced efficiency and stability of 2.0% BP/MAPbI(3)-based perovskite solar cells arising from impeded Pb-0-defect generation and suppressed charge-carrier recombination.

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