期刊
ADVANCED ENERGY MATERIALS
卷 9, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201901980
关键词
halide segregation; indoor light harvesting; perovskite solar cells; tailored bandgap; triple anion
类别
资金
- General Research Fund of the Research Grants Council of Hong Kong Special Administrative Region, China [17204516, 17206518]
- Environment and Conservation Fund [ECF 49/2017]
- Seed Fund for Strategic Interdisciplinary Research Scheme at the University of Hong Kong
- HKU-Zhejiang Institute of Research and Innovation (HKU-ZIRI)
Indoor photovoltaics are promising to enable self-powered electronic devices for the Internet of Things. Here, reported is a triple-anion CH3NH3PbI2-xBrClx perovskite film, of which the bandgap is specially designed for indoor light harvesting to achieve a record high efficiency of 36.2% with distinctive high open circuit voltage (V-oc) of 1.028 V under standard 1000 lux fluorescent light. The involvement of both bromide and chloride suppresses the trap-states and nonradiative recombination loss, exhibiting a remarkable ideality factor of 1.097. The introduction of chloride successfully restrains the halide segregation of iodide and bromide, stabilizing the triple-anion perovskite film. The devices show an excellent long-term performance, sustaining over 95% of original efficiency under continuous light soaking over 2000 h. These findings show the importance and potential of I/Br/Cl triple-anion perovskite with tailored bandgap and suppressed trap-states in stable and efficient indoor light recycling.
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