CsPbBrI2 perovskites with low energy loss for high-performance indoor and outdoor photovoltaics

• 作者: Kai-Li Wang Xiao-Mei Li Yan-Hui Lou Meng Li Zhao-Kui Wang
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: ARTICLES
• 页码范围: 347-353
• 页数: 7页
• 语种: 英文

摘要

Over the years,the efficiency of inorganic perovskite solar cells (PSCs) has increased at an unprecedented pace.However,energy loss in the device has limited a further increase in efficiency and commercialization.In this work,we used (NH4)2C2O4·H2O to treat CsPbBrl2 perovskite film during spin-coating.The CsPbBrI2 underwent secondary crystallization to form high quality films with micrometer-scale and low trap density.(NH4)2C2O4·H2O treatment promoted charge transfer capacity and reduced the ideal factor.It also dropped the energy loss from 0.80 to 0.64 eV.The resulting device delivered a power conversion efficiency (PCE) of 16.55％ with an open-circuit voltage (Voc) of 1.24 V,which are largely improved compared with the reference device which exhibited a PCE of 13.27％ and a Voc of 1.10 V.In addition,the optimized treated device presented a record indoor PCE of 28.48％ under a fluorescent lamp of 1000 lux,better than that of the reference device (19.05％).