期刊
ADVANCED MATERIALS
卷 34, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202206222
关键词
carbon electrodes; CsPbI; Br-2; moisture; oxygen; perovskite solar cells
类别
资金
- Guangdong Laboratory for Lingnan Modern Agriculture [NZ2021030]
- National Natural Science Foundation of China (NFSC) [21975083, U21A20310, 51732004, 22122805, 22075090]
Environmental factors such as moisture play a significant role in defect management during the re-annealing process of CsPbI2Br crystalline films. The presence of moisture reduces the oxidation kinetics and enables orderly oxidation, leading to improved photovoltaic performance in CsPbI2Br C-PSCs. The champion cell achieved a record efficiency of 15.27% in this study, highlighting the importance of defect management in enhancing the performance of carbon-based perovskite solar cells.
Large energy loss (E-loss) caused by defect-assisted recombination makes the photovoltaic performance of carbon-based perovskite solar cells (C-PSCs) inferior to that of metal-electrode ones. Herein, the influence of environmental factors (moisture and oxygen) on defect management during re-annealing process of CsPbI2Br crystalline films is systematically studied. Density functional theory and experimental results indicate that moisture in the air can significantly reduce the oxidation kinetics of crystalline films, resulting in orderly oxidation. Concomitantly, the oxidation decomposition products PbO and CsPbIBr2 are enriched at grain boundaries, passivating surface defects efficiently. Simultaneously, energy band coupling between CsPbI2Br and CsPbIBr2 improves the hole extraction efficiency. The photovoltage of corresponding C-PSCs is increased from 1.05 to 1.32 V, indicating a reduced E-loss derived from orderly oxidation strategy. Correspondingly, the champion cell achieves an efficiency of 15.27%, and a certified efficiency of 14.7%, which is a new record efficiency for CsPbI2Br C-PSCs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据