MAPbI3−xBrx mixed halide perovskites for fully printable mesoscopic solar cells with enhanced efficiency and less hysteresis

Abstract

Hybrid lead-halide perovskite solar cells (PSCs) are promising alternatives to silicon-based cells due to their high photovoltaic performance and low cost. We report herein fully printable perovskite solar cells with a mesoporous TiO₂/Al₂O₃/C architecture in combination with mixed-halide MAPbI_3−xBr_x perovskites. A maximum conversion efficiency of 13.49% can be achieved with an increased open circuit voltage of 1.01 V, which is higher than the MAPbI₃-based devices. A reduced anomalous hysteresis in the J–V curve measurement has been demonstrated in perovskite solar cells based on MAPbI_2.4Br_0.6 perovskite, which is directly linked to the characteristically slow kinetics measured through electrochemical impedance spectroscopy.