Wang Baoning, Li Na, Yang Lin, Dall'Agnese Chunxiang, Jena Ajay Kumar, Sasaki Shin-Ichi, Miyasaka Tsutomu, Tamiaki Hitoshi, Wang Xiao-Feng
Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun 130012, China.
Graduate School of Engineering, Toin University of Yokohama, Kanagawa 225-8503, Japan.
J Am Chem Soc. 2021 Feb 10;143(5):2207-2211. doi: 10.1021/jacs.0c12786. Epub 2021 Feb 1.
The power conversion efficiency (PCE) of CsAgBiBr-based perovskite solar cells (PSCs) is still low owing to the inherent defects of CsAgBiBr films. Herein, we demonstrate a carboxy-chlorophyll derivative (C-Chl)-sensitized mesoporous TiO (m-TiO) film as an electron transport layer (ETL) to enhance and extend the absorption spectrum of CsAgBiBr-based PSCs. The C-Chl-based device achieves a significantly improved PCE, exceeding 3% for the first time, with an increase of 27% in short-circuit current density. Optoelectronic investigations confirm that the introduction of C-Chl reduces the defects, accelerates the electron extraction, and suppresses charge recombination at the interface of ETL/perovskite. Moreover, the unencapsulated PSCs display restrained hysteresis and great stability under ambient conditions.
由于CsAgBiBr薄膜的固有缺陷，基于CsAgBiBr的钙钛矿太阳能电池（PSC）的功率转换效率（PCE）仍然很低。在此，我们展示了一种羧基叶绿素衍生物（C-Chl）敏化的介孔TiO（m-TiO）薄膜作为电子传输层（ETL），以增强和扩展基于CsAgBiBr的PSC的吸收光谱。基于C-Chl的器件实现了显著提高的PCE，首次超过3%，短路电流密度增加了27%。光电研究证实，C-Chl的引入减少了缺陷，加速了电子提取，并抑制了ETL/钙钛矿界面处的电荷复合。此外，未封装的PSC在环境条件下表现出抑制的滞后现象和良好的稳定性。
