Abstract
All-inorganic cesium lead iodide(CsPbl3)perovskites with superior thermal stability are attractive can-didates for perovskite solar cells(PSCs).Fabricating such inorganic PSCs in the ambient atmosphere is desirable for practical production,however,the challenge remains in inhibiting the phase transition of CsPbl3 in ambient air.Herein,we demonstrate a dual bulk and interface engineering using ionic liquid to stabilize CsPbI3 perovskite structure,thus enhancing the performance of ambient-processed inverted CsPbI3 PSCs.Such dual bulk and interface engineering is found effective not only in suppressing the bulk and interfacial charge carrier recombination and enhancing charge carrier transport and extraction,but also in protecting CsPbI3 crystal structure by leaving hydrophobic alkyl chains coverage at the boundary and surface to prevent phase transition caused by moisture from ambient air.The optimized device fully processed in the open air with relative humidity up to 55％exhibits remarkably enhanced efficiency and stability over the control device,with the efficiency increasing from 8.6％to 13.21％,and 92％efficiency maintaining after storage for 1680 h,which outperforms the control device with only 82％retaining after 648 h storage.We thus believe this work can provide an efficient alternative for the low-cost fabrication of ambient-processible PSCs.
基金项目
Basic Research Programs of Taicang(2021)(TC2021JC22)
Guangdong Basic and Applied Basic Research Foundation(2020A1515110727)
国家自然科学基金(52002327)
国家自然科学基金(62004169)
国家自然科学基金(51972272)
中央高校基本科研业务费专项()
Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(2019-QZ-03)
万方数据