Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 66, Issue -, Pages 152-160Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2021.07.030
Keywords
Evolution of PbI2; Defect passivation; Two-step method; Triple cation; Perovskite solar cells
Funding
- Young Scholars Development Fund of SWPU [201699010017]
- Sichuan Science and Technology Program [2018JY0015]
- National Nature Science Foundation of China [61774022]
- 2020 Li Ka Shing Foundation Cross-Disciplinary Research [2020LKSFG01A]
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CsFAMA mixed perovskites show increased power conversion efficiency over time, with PbI2 playing a role in defect passivation in the perovskite film. The study explores the relationship between enhanced device performance, excess PbI2, and PbI2 evolution in triple cation perovskite films.
The triple cation mixed perovskites (CsFAMA) are known as one of the most efficient candidates for perovskite solar cells (PSCs). It is found that the power conversion efficiency (PCE) of triple-cation based devices would increase with the test time extending, and the maximum efficiency is normally obtained after several days aging storage. Here, the relationship between enhanced device performance, excess PbI2 and its evolution in triple cation perovskite films of initial days was systematically explored. The CsFAMA-PSCs are prepared by two-step methods under two environmental conditions, including in the glove box and the ambient air (30% humidity). After 7 days testing, the maximum PCE of PSCs under two conditions dramatically increased 12.4% and 12.2%, reached 21.68% and 21.89%, respectively. At initial days, the XRD peak intensities of perovskite phase gradually decreased and those corresponding to PbI2 increased. Along with time-resolved photoluminescence (TRPL) and kelvin probe force microscopy (KPFM), it was found that the defects were passivated with the evolution of PbI2. This work reveals the excess PbI2 and its evolution in perovskite film, which can further supplement the understanding of PbI2 defect passivation. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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