材料科学
水分
退火(玻璃)
化学工程
能量转换效率
氧气
钙钛矿太阳能电池
纳米技术
光电子学
复合材料
有机化学
工程类
化学
作者
Guizhi Zhang,Jianxin Zhang,Zechao Yang,Zhenxiao Pan,Huashang Rao,Xinhua Zhong
标识
DOI:10.1002/adma.202206222
摘要
Large energy loss (Eloss ) 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 CsPbI2 Br 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 CsPbI2 Br 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 Eloss 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 CsPbI2 Br C-PSCs.
科研通智能强力驱动
Strongly Powered by AbleSci AI