Journal
SMALL
Volume 15, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201804465
Keywords
air-knife; ambient process; dim lights; perovskites; recrystallization
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Funding
- 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)
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The photovoltaic performance of perovskite solar cells is highly dependent on the control of morphology and crystallization of perovskite film, which usually requires a controlled atmosphere. Therefore, fully ambient fabrication is a desired technology for the development of perovskite solar cells toward real production. Here, an air-knife assisted recrystallization method is reported, based on a simple bath-immersion to prepare high-quality perovskite absorbers. The resulted film shows a strong crystallinity with pure domains and low trap-state density, which contribute to the device performance and stability. The proposed method can operate in a wide process window, such as variable relative humidity and bath-immersion conditions, demonstrating a power conversion efficiency over 19% and 27% under 1 sun and 500-2000 lux dim-light illumination respectively, which is among the highest performance of ambient-process perovskite solar cells.
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