Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 14, Pages 3787-3791Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201800019
Keywords
all-inorganic perovskite solar cells; charge extraction; charge recombination; multistep deposition; stability
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Funding
- National Natural Science Foundation of China [61774139, 21503202, 61604143]
- Shandong Provincial Natural Science Foundation [JQ201714]
- Director Foundation from Qingdao National Laboratory for Marine Science and Technology [QNLM201702]
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All-inorganic perovskite solar cells with high efficiency and improved stability are promising for commercialization. A multistep solution-processing method was developed to fabricate high-purity inorganic CsPbBr3 perovskite films for use in efficient solar cells. By tuning the number of deposition cycles (n) of a CsBr solution, the phase conversion from CsPb2Br5 (n 3), to CsPbBr3 (n=4), and Cs4PbBr6 (n5) was optimized to achieve vertical- and monolayer-aligned grains. Upon interfacial modification with graphene quantum dots, the all-inorganic perovskite solar cell (without a hole-transporting layer) achieved a power conversion efficiency (PCE) as high as 9.72% under standard solar illumination conditions. Under challenging conditions, such as 90% relative humidity (RH) at 25 degrees C or 80 degrees C at zero humidity, the optimized device retained 87% PCE over 130days or 95% over 40days, compared to the initial efficiency.
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