期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 9, 页码 3438-3445出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta07983g
关键词
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资金
- National Basic Research Program of China [2015CB352005]
- National Natural Science Foundation of China [61525503, 61378091, 61405123]
- Guangdong Natural Science Foundation [2014A030312008]
- Shenzhen Basic Research Project [JCYJ20130329115524512, ZD5Y520140430164957663, KQCX20140509172719305]
- Training Plan of Guangdong Province Outstanding Young Teachers in Higher Education Institutions [Yq2013142]
Perovskites have recently emerged as promising materials for high-performance, low-cost photovoltaic devices. Here, we report a one-step, solvent-induced, fast crystallization method based on sec-butyl alcohol to produce flat, uniform CH3NH3PbI3 films. sec-Butyl alcohol has proven to be a suitable solvent not only for the CH3NH3PbI3 fast crystallization deposition process, but also for adjusting the amount of CH3NH3I in CH3NH3PbI3 films. Planar heterojunction solar cells with flat and pinhole-free CH3NH3PbI3 films yielded an average power conversion efficiency (PCE) of 13.1 +/- 1.2% and the highest PCE of 14.3%; no hysteresis was observed by changing the scan direction in our devices under standard AM 1.5 illumination. Remarkably, we found that the presence of CH3NH3I in CH3NH3PbI3 films has a positive effect on the photovoltaic device performance.
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