In-situ cross-linking strategy for efficient and operationally stable methylammoniun lead iodide solar cells

Xiaodong Li, Wenxiao Zhang, Ying-Chiao Wang, Wenjun Zhang, Hai-Qiao Wang and Junfeng Fang ()
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Xiaodong Li: Chinese Academy of Sciences
Wenxiao Zhang: Chinese Academy of Sciences
Ying-Chiao Wang: Chinese Academy of Sciences
Wenjun Zhang: Chinese Academy of Sciences
Hai-Qiao Wang: Chinese Academy of Sciences
Junfeng Fang: Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Long-term operational stability is the foremost issue delaying the commercialization of perovskite solar cells (PSCs). Here we demonstrate an in-situ cross-linking strategy for operationally stable inverted MAPbI3 PSCs through the incorporation of a cross-linkable organic small molecule additive trimethylolpropane triacrylate (TMTA) into perovskite films. TMTA can chemically anchor to grain boundaries and then in-situ cross-link to a robust continuous network polymer after thermal treatment, thus enhancing the thermal, water-resisting and light-resisting properties of organic/perovskite films. As a result, the cross-linked PSCs exhibit 590-fold improvement in operational stability, retaining nearly 80% of their initial efficiency after continuous power output for 400 h at maximum power point under full-sun AM 1.5 G illumination of Xenon lamp without any UV-filter. In addition, under moisture or thermal (85 °C) conditions, cross-linked TMTA-based PSCs also show excellent stability with over 90% of their initial or post burn-in efficiency after aging for over 1000 h.

Date: 2018
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DOI: 10.1038/s41467-018-06204-2

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