期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 36, 页码 40364-40371出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c12068
关键词
CsPbI3 perovskite solar cells; ion migration; light-induced ion redistribution; phase stability; defect passivation
资金
- National Natural Science Foundation of China [11947219, 61804097]
- Natural Science Foundation of Guangdong Province, China [2018A030310596, 2020A1515010792]
- Science and Technology Innovation Commission of Shenzhen [JCYJ20170818095753613]
- China Postdoctoral Science Foundation [2018M643173]
- State Key Laboratory of Advanced Displays and Optoelectronics Technologies (HKUST)
Inorganic halide perovskites have been demonstrated as a promising alternative for light absorption because of their improved thermal stability compared with organic-inorganic halide perovskites. However, low power conversion efficiency and phase instability are major hindrances to their application. Here, a straightforward approach, by adding a layer of CsBr on the top of CsPbI3, is reported for high-efficiency and phase-stable CsPbI3-based solar cells. Characterizations demonstrate that the bromide ion can migrate from the surface into the bulk of CsPbI3, mitigating the nonuniform depth distribution of iodide in the CsPbI3 absorber and passivating the bulk defects. Impressively, the light illumination can induce secondary-ion redistribution, which is identified as a crucial process to further enhance the carrier extraction efficiency, strengthen the lattice stability, and improve the film homogenization. Accordingly, a high efficiency of 17% is obtained for the CsPbI3-based solar cell. Moreover, the unencapsulated device exhibits remarkable phase stability, maintaining 93% of its initial efficiency under room temperature after being stored in the nitrogen glovebox for over 5000 h.
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