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Alkyl‐Chain‐Regulated Charge Transfer in Fluorescent Inorganic CsPbBr 3 Perovskite Solar Cells
Author(s) -
Duan Jialong,
Wang Yudi,
Yang Xiya,
Tang Qunwei
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202000199
Subject(s) - perovskite (structure) , energy conversion efficiency , optoelectronics , materials science , photochemistry , quantum efficiency , absorption (acoustics) , quantum dot , band gap , alkyl , chemistry , organic chemistry , composite material
Improved charge extraction and wide spectral absorption promote power conversion efficiency of perovskite solar cells (PSCs). The state‐of‐the‐art carbon‐based CsPbBr 3 PSCs have an inferior power output capacity because of the large optical band gap of the perovskite film and the high energy barrier at perovskite/carbon interface. Herein, we use alkyl‐chain regulated quantum dots as hole‐conductors to reduce charge recombination. By precisely controlling alkyl‐chain length of ligands, a balance between the surface dipole induced charge coulomb repulsive force and quantum tunneling distance is achieved to maximize charge extraction. A fluorescent carbon electrode is used as a cathode to harvest the unabsorbed incident light and to emit fluorescent light at 516 nm for re‐absorption by the perovskite film. The optimized PSC free of encapsulation achieves a maximum power conversion efficiency up to 10.85 % with nearly unchanged photovoltaic performances under 80 %RH, 80 °C, or light irradiation in air.