期刊
ORGANIC ELECTRONICS
卷 53, 期 -, 页码 249-255出版社
ELSEVIER
DOI: 10.1016/j.orgel.2017.11.045
关键词
Large grain-size; Long-term moisture stability; Mixed cations and mixed halide perovskite; Lead thiocyanate additive; Solar cell
资金
- National Key R&D Program of China [2016YFB0401303]
- National Nature Science Foundation of China [21676188]
- Key Projects in National Science Foundation of Tianjin [16JCZDJC37100]
The commercialization of organic-inorganic hybrid perovskite solar cells (PSCs) has been impeded by their structural instability and susceptibility towards moisture. We demonstrate the fabrication of mixed cation lead mixed halide FA(0.8)Cs(0.2)PbI(2.68)Br(0.32) perovskite solar cells with long-term stability by addition of the Pb(SCN)(2) additive. The introduction of Pb(SCN)(2) improves the crystallinity of perovskite to promote the generation of high-quality film. The perovskite films with Pb(SCN)(2) exhibit large grain-size, less pinholes, reduced trap density and prolonged charge carrier lifetime. The PSCs with 2 mol % Pb(SCN)(2) fabricated in ambient environment have showed notable power conversion efficiency (PCE) of 17.0% with less hysteresis and remarkably high moisture stability. The PCE of unsealed devices maintained 85.1% of the initial value under ambient environment (60 +/- 5% RH) after 45 days.
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