期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 39, 页码 33205-33213出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10616
关键词
perovskite solar cells; interface modification; stability; ion migration; cesium acetate
资金
- National Natural Science Foundation of China (NSFC) [51622201, 91733301, 61571015, 51872007]
A consensus has been reached that organic transport layer (e.g., Spiro-OMeTAD) in perovskite solar cell (PSC) is prone to be impact by mobile ions in perovskite film during long-term operation. Here, we incorporate cesium acetate as a buffer layer into perovskite solar cells to mitigate this detrimental behavior, in which cesium acetate is sandwiched between perovskite and organic transport layer. The mobile ions that migrate toward the organic transport layer (e.g., MA(+)) are gradually consumed by cesium acetate, resulting in cesium-rich perovskite at the interface. This in situ reaction and the subsequent Cs incorporation greatly enhance the operational stability of PSC without efficiency loss. The optimized PSC presents a power conversion efficiency of 20.9% with an open-circuit voltage of 1.18 V, maintaining similar to 80% of its initial efficiency after 4500 min continuous operation at maximum power point. This new strategy opens up a new opportunity for fabricating stable perovskite solar cells.
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