期刊
ISCIENCE
卷 15, 期 -, 页码 156-+出版社
CELL PRESS
DOI: 10.1016/j.isci.2019.04.025
关键词
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资金
- Young Talent of Zhuoyue Program of Beihang University
- National Natural Science Foundation of China [21875013, 21603010]
- Beijing Natural Science Foundation [2182031]
- Shenzhen Peacock Plan [KQTD2016053015544057]
- HK-RGC General Research Funds (GRF) [16312216]
- HK Innovation and Technology Fund [GHP/079/17SZ]
The CsPbI3 inorganic perovskite is a potential candidate for fabricating long-term operational photovoltaic devices owing to its intrinsic superb thermal stability. However, the carbon-based CsPbI3 perovskite solar cells (C-PSCs) without hole transport material (HTM) are currently disadvantaged by their relatively low power conversion efficiency resulting from the poor grain quality and mismatched energy band levels of the as-made CsPbI3 films. Herein we demonstrate that by doping Na into the CsPbI3 lattice, the grain quality is significantly improved with low defect density, and also, the energy band levels are better matched to the contact electrodes, affording a higher builtin potential. Consequently, the V-oc of the C-PSCs is drastically increased from 0.77 to 0.92 V, and the efficiency from 8.6% to 10.7%, a record value for the CsPbI3 PSCs without HTM. Moreover, the non-encapsulated device showed virtually no performance degradation after 70 days of storage in air atmosphere.
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