A prenucleation strategy for ambient fabrication of perovskite solar cells with high device performance uniformity

Kai Zhang, Zheng Wang, Gaopeng Wang, Jian Wang, Yu Li, Wei Qian, Shizhao Zheng, Shuang Xiao () and Shihe Yang ()
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Kai Zhang: Peking University
Zheng Wang: Peking University
Gaopeng Wang: Peking University
Jian Wang: Peking University
Yu Li: Peking University
Wei Qian: Peking University
Shizhao Zheng: Peking University
Shuang Xiao: Peking University
Shihe Yang: Peking University

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Humidity is known to be inimical to the halide perovskites and thus typically avoided during fabrication. The poor fundamental understanding of chemical interactions between water and the precursors hampers the further development of perovskite fabrication in ambient atmosphere. Here, we disclose a key finding that the ambient water could promote the formation of lead complexes, which when uncontrolled would make their way into large intermediate fibrillar crystallites and thus discontinuous perovskite films unfavorable for photovoltaics among others. To counter this effect, a prenucleation strategy is proposed, which embodies the controlled burst of profuse intermediate nuclei. Consequently, we are able to obtain a compact and uniform perovskite layer, which affords high efficiency perovskite solar cells. More excitingly, the solar cells show high performance uniformity, demonstrating the distinctive advantages of our prenucleation strategy. This work sheds light on developing reliable and cost-effective fabrication methods for industrial production of perovskite solar cells.

Date: 2020
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DOI: 10.1038/s41467-020-14715-0

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