期刊
CHEM
卷 5, 期 4, 页码 995-1006出版社
CELL PRESS
DOI: 10.1016/j.chempr.2019.02.025
关键词
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资金
- National Basic Research Program of China, Fundamental Studies of Perovskite Solar Cells [2015CB932200]
- Natural Science Foundation of China [51602149, 61705102, 91733302]
- Natural Science Foundation of Jiangsu Province, China [BK20150064, BK20161011, BK20161010]
- Young 1000 Talents Global Recruitment Program of China
- Jiangsu Specially Appointed Professor Program
- Six Talent Peaks'' Project in Jiangsu Province, China
- Nanjing Tech University
Here, we report an alternative environmentally friendly room-temperature molten salt, methylammonium acetate (MAAc), as a novel solvent for facile fabrication of perovskite solar cells (PSCs) in ambient air. MAAc possesses excellent chemical properties along with high viscosity, negligible vapor pressure, and a nonhazardous nature. Complete solubility of both methylammonium and lead salts by hydrogen bonds in MAAc was observed. Dense and pinholefree perovskite films with high reproducibility can be readily prepared by a simple one-step method without an anti-solvent even under a relative humidity of over 80%. Under optimized processing conditions, we achieved an average power conversion efficiency of 18.42% and a maximum efficiency of 20.05% in CH3NH3PbI3-based planar heterojunction structure. In addition, devices without encapsulation remained above 93% of their original efficiency for more than 1,000 h in ambient air. These findings may open up the possibility of developing a new approach for further improving PSC performance with higher reproducibility and reliability in ambient atmosphere.
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