期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 28, 页码 33218-33225出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c05097
关键词
perovskite; solar cells; lead-free; ionic liquid; defects; stability
资金
- National Natural Science Foundation of China [61935016]
- China Postdoctoral Science Foundation [2019M663717, 2020T130502]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JQ-119]
By introducing FAAc, we successfully developed a strategy for the formation of high-quality films in Sn-based PSCs, achieving improved device performance and maintaining 82% of the initial efficiency in a light aging test.
Sn-based perovskite solar cells (PSCs) have received extensive attention for photovoltaic applications. Nevertheless, the low crystallization quality of the film due to rapid crystallization results in high trap density of states, which is one of the main reasons for poor performance of Sn-based PSC devices. In this work, we developed a strategy for the formation of FASnI(3) perovskites by introducing the addition of formamidine acetate (FAAc). Benefiting from the iodide-coordinated cation (FA(+)) and crystallization-regulated anion (AC(-)), FAAc could achieve the high-quality films with suppressed defects. The champion power conversion efficiency (PCE) of FAAc-modified PSC devices reached 9.96%, reserving 82% of their initial PCE of the light aging test over 1500 h. We hope that our finding could provide implications on the high-performance and stable Sn-based PSCs.
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