Low-temperature sequential deposition for efficient inverted perovskite solar cells

Mengjiong Chen, Zhenzhen Qin, Ziyang Zhang, Wenxiang Xiang, Yingming Liu, Chuang Tian, Siyuan Chen, Yanbo Wang () and Liyuan Han ()
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Mengjiong Chen: Shanghai Jiao Tong University
Zhenzhen Qin: Shanghai Jiao Tong University
Ziyang Zhang: Shanghai Jiao Tong University
Wenxiang Xiang: Shanghai Jiao Tong University
Yingming Liu: Shanghai Jiao Tong University
Chuang Tian: Shanghai Jiao Tong University
Siyuan Chen: Shanghai Jiao Tong University
Yanbo Wang: Shanghai Jiao Tong University
Liyuan Han: Shanghai Jiao Tong University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Inverted perovskite solar cell has made significant progress in recent years. Although two-step sequential deposition shows the benefits to obtain higher quality large-size perovskite crystals, the high annealing temperature, which is required to achieve phase transition, leads to the desorption of self-assembled molecules at the buried interface and induces redundant lead iodide at the top interface. Here, we propose a low temperature sequential deposition method by introduce a tailor-made 3-ethyl-1-methyl-1H-imidazol-3-ium dimethyl phosphate into lead iodide precursor solution to facilitate the sufficient reaction between lead iodide and organic salts, and lower the energy barrier from delta- to alpha-perovskite. As a result, highly crystallized and pure alpha-phase perovskite films with large grain size are fabricated, preventing the damage to buried self-assembled molecules and the formation of redundant lead iodide, which contributes to a high open circuit voltage of 1.21 V and a certified efficiency of 26.0%. The encapsulated devices show improved stability following ISOS-D-3 and ISOS-L-2 protocols.

Date: 2025
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DOI: 10.1038/s41467-025-61144-y

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