材料科学
钝化
量子点
钙钛矿(结构)
能量转换效率
光伏系统
铯
纳米技术
相(物质)
化学工程
纳米晶
化学稳定性
光电子学
图层(电子)
无机化学
化学
生态学
有机化学
工程类
生物
作者
Yueli Liu,Xiaolei Zhang,Zifan Yang,Keqiang Chen,Wen Chen
标识
DOI:10.1021/acsami.4c02917
摘要
Inorganic CsPbI3 perovskite quantum dots (PQDs) possess remarkable optical properties, making them highly promising for photovoltaic applications. However, the inadequate stability resulting from internal structural instability and the complex external surface chemical environment of CsPbI3 PQDs has hindered the development of CsPbI3 PQD solar cells (PQDSCs). In this work, the capping layer composed of inorganic two-dimensional (2D) Ruddlesden-Popper (RP) phase Cs2PbI2Cl2 nanosheets (NSs) is introduced, which may be effectively treated to improve the surface properties of the CsPbI3 PQD film. This modification serves to passivate defects by filling cesium and iodine vacancies while optimizing the energy band arrangement and preventing humidity intrusion, leading to the meliorative stability and photovoltaic performance. The optimized CsPbI3 PQDSCs achieve an enhanced power conversion efficiency (PCE) of 14.73%, with the superb stability of only a 16% efficiency loss after being exposed to ambient conditions (30 ± 5% RH) for 432 h.
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