Low-pressure accessible gas-quenching for absolute methylammonium-free perovskite solar cells

Tian Hou; Meng Zhang; Wenjing Yu; Xin Wang; Zhengying Gu; Qian Chen; Lan Lan; Xiaoran Sun; Yuelong Huang; Bolin Zheng; Xu Liu; Martin A. Green; Xiaojing Hao

doi:10.1039/D1TA08402J

Low-pressure accessible gas-quenching for absolute methylammonium-free perovskite solar cells†

Tian Hou,^a Meng Zhang,

*^abd Wenjing Yu,^a Xin Wang,^a Zhengying Gu,^c Qian Chen,^a Lan Lan,^a Xiaoran Sun,*^a Yuelong Huang,*^ab Bolin Zheng,^d Xu Liu,^d Martin A. Green^d and Xiaojing Hao*^d

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* Corresponding authors

^a Institute of Photovoltaics, Southwest Petroleum University, Chengdu 610500, China
E-mail: meng.zhang@swpu.edu.cn

^b State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China

^c School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China

^d The Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, Australia

Abstract

Gas-quenching is a promising technique for the up-scalable fabrication of metal halide perovskite solar cells (PSCs). However, it has been challenging to produce high-quality gas-quenched perovskite films without the use of the methylammonium (MA) cation. By employing tetramethylene sulfoxide (TMSO) as a ligand in the precursor solution, high-quality FA_0.9Cs_0.1PbI₃ perovskite films have been successfully obtained by gas-quenching. A study on the precursor solution and film-forming process revealed the effect of TMSO on the formation of large-grain films, as well as the critical role of gas-quenching in regulating the intermediate films. The absolute MA-free perovskite device exhibits superior stability over the PSCs obtained with the MACl additive. The fabricated MA- and Br-free PSCs show a power conversion efficiency of 21.3% without any passivation treatment. Moreover, gas-quenching with TMSO enables a wide gas pressure processing window and superior accessibility to low-pressure processing, demonstrating its promising potential in up-scaling manufacturing of high-efficiency MA-free PSCs.

Journal of Materials Chemistry A

Low-pressure accessible gas-quenching for absolute methylammonium-free perovskite solar cells†

Abstract

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Low-pressure accessible gas-quenching for absolute methylammonium-free perovskite solar cells

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