Abstract
The electron‐transporting layer (ETL) plays a critical role in improving the charge extraction and suppressing the carrier recombination in planar perovskite solar cells (PSCs). Compact titanium dioxide (TiO2) film is a widely used as an ETL in conventional n‐i‐p PSCs. However, there is still much room for improvement in the electron mobility and reducing the oxygen vacancies of the compact TiO2 film. Herein, Pt‐doped TiO2 film with outstanding electron‐transporting property and complete coverage on the substrates is reported by the authors. Pt‐doping results in a tailed band level of TiO2, which could suppress the charge accumulation at the interface of TiO2‐Pt/perovskite. Consequently, TiO2‐Pt ETL based PSCs deliver a power conversion efficiency as high as 20.05% with an open‐circuit voltage of 1.15 V, a fill factor of 0.75, a short‐circuit current density of 23.83 mA cm−2 and remarkably alleviated hysteresis behavior.
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