Che Yuhang, Liu Zhike, Duan Yuwei, Wang Jungang, Yang Shaomin, Xu Dongfang, Xiang Wanchun, Wang Tao, Yuan Ningyi, Ding Jianning, Liu Shengzhong Frank
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy, Technology School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710119, China.
Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, China.
Angew Chem Int Ed Engl. 2022 Aug 15;61(33):e202205012. doi: 10.1002/anie.202205012. Epub 2022 Jul 8.
All-inorganic CsPbI perovskite presents preeminent chemical stability and a desirable band gap as the front absorber for perovskite/silicon tandem solar cells. Unfortunately, CsPbI perovskite solar cells (PSCs) still show low efficiency due to high density of defects in solution-prepared CsPbI films. Herein, three kinds of hydrazide derivatives (benzoyl hydrazine (BH), formohydrazide (FH) and benzamide (BA)) are designed to reduce the defect density and stabilize the phase of CsPbI . Calculation and characterization results corroborate that the carboxyl and hydrazine groups in BH form strong chemical bonds with Pb ions, resulting in synergetic double coordination. In addition, the hydrazine group in the BH also forms a hydrogen bond with iodine to assist the coordination. Consequently, a high efficiency of 20.47 % is achieved, which is the highest PCE among all pure CsPbI -based PSCs reported to date. In addition, an unencapsulated device showed excellent stability in ambient air.
全无机CsPbI钙钛矿作为钙钛矿/硅串联太阳能电池的前吸收层，具有卓越的化学稳定性和理想的带隙。不幸的是，由于溶液制备的CsPbI薄膜中缺陷密度高，CsPbI钙钛矿太阳能电池（PSC）的效率仍然很低。在此，设计了三种酰肼衍生物（苯甲酰肼（BH）、甲酰肼（FH）和苯甲酰胺（BA））来降低缺陷密度并稳定CsPbI的相。计算和表征结果证实，BH中的羧基和肼基与Pb离子形成强化学键，从而产生协同双配位。此外，BH中的肼基还与碘形成氢键以辅助配位。因此，实现了20.47%的高效率，这是迄今为止报道的所有基于纯CsPbI的PSC中最高的光电转换效率。此外，未封装的器件在环境空气中表现出优异的稳定性。
