Fullerene-Based Electron Transport Layers for Semi-Transparent MAPbBr 3 Perovskite Films in Planar Perovskite Solar Cells

摘要

In this study, four kinds of structures—[6,6]-phenyl-C 61 -butyric acid methyl ester (PCBM), PCBM/fullerene (C 60 ), C 60 /bathocuproine (BCP), and PCBM/C 60 /BCP—were used as electron transport layers, and the structure, and optical and electronic behaviors of MAPbBr 3 perovskite layers after annealing treatments were observed. The experimental results indicate that PCBM/C 60 bi-layer structure is acceptable for MAPbBr 3 planar perovskite solar cells due to electron step transporting. Low-temperature annealing is suitable for smooth and large grain MAPbBr 3 films. The semi-transparent yellow C 60 /PCBM/MAPbBr 3 /PEDOT:PSS/ITO glass-structure solar cells exhibit the best performance with a power conversion efficiency of 4.19%. The solar cells are revealed to be suitable for application in building integrated photovoltaic (BIPV) systems.