Synergistic Hematite–Fullerene Electron-Extracting Layers for Improved Efficiency and Stability in Perovskite Solar Cells

2018 
Hematite, α-Fe2O3, is arising as a promising electron-extraction material in perovskite solar cells, yet present α-Fe2O3-based perovskite solar cells still show unsatisfactory efficiencies owing to large charge recombination. In this contribution, phenyl-C61-butyric acid methyl ester (PCBM) and α-Fe2O3 synergistically worked together as the electron transport layer (ETL) in planar heterojunction perovskite solar cells. The introduction of fullerene at the top of the α-Fe2O3 ETL improved the crystallinity of CH3NH3PbI3 perovskite and facilitated electron extraction. As a consequence, a substantially retarded charge recombination largely boosted the short-circuit current density and power conversion efficiency of perovskite solar cells. The optimized perovskite solar cells with α-Fe2O3/PCBM ETL showed a competitive power conversion efficiency of 14.2 %, which is 20 % higher than that of pristine α-Fe2O3-based solar cells. Moreover, α-Fe2O3/PCBM-based perovskite solar cells exhibited improved stability compared to the pristine α-Fe2O3-based devices, retaining over 95 % of their initial values after 45 days storage in dark in humid air.
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