Deuteration-functionalized self-assembled monolayers for UV-durable perovskite solar cells

Desheng Li; Junjie Zhao; Bitao Dong; Qunping Fan; Zedong Lin; Fan Wu; Xiangwen Guo; Bingsuo Zou; Yingguo Yang; Fei Zhang; Long Jiang; Wei Ma; Yuhang Liu; Kai Chen

doi:10.1002/inf2.70140

InfoMat ›› 2026, Vol. 8 ›› Issue (7) :e70140 DOI: 10.1002/inf2.70140

RESEARCH ARTICLE

Deuteration-functionalized self-assembled monolayers for UV-durable perovskite solar cells

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¹. State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials, and School of Resources, Environment and Materials, Guangxi University, Nanning, the People's Republic of China

². State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, the People's Republic of China

³. MOE Key Lab of Materials Physics and Chemistry in Extraordinary Conditions, Shaanxi Key Lab of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, the People's Republic of China

⁴. School of Materials Science and Engineering, Taizhou University, Taizhou, the People's Republic of China

⁵. State Key Laboratory of Photovoltaic Science and Technology School of Microelectronics, Fudan University, Shanghai, the People's Republic of China

⁶. School of Chemical Engineering and Technology, China and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin, the People's Republic of China

⁷. State Key Laboratory of Oil and Gas Equipment, CNPC Tubular Goods Research Institute, Xi'an, Shaanxi, the People's Republic of China

dongbitao0023@outlook.com

zedonglin@alu.ruc.edu.cn

fei_zhang@tju.edu.cn

yuhang.liu@xjtu.edu.cn

chenkai@gxu.edu.cn

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Abstract

Ultraviolet (UV) light-induced degradation at the buried interface poses a significant challenge to the long-term stability of perovskite solar cells (PSCs), resulting in substantial efficiency losses and hindering their commercialization. Here, we developed two simple deuterated self-assembled monolayers (SAMs), 2DPh-4PACz and 1DPh-4PACz. In particular, 2DPh-4PACz, featuring double deuterophenyl groups as π-conjugated extension units, demonstrates enhanced intrinsic UV stability, improved hole-extraction capability, and effective protection of the perovskite film against UV exposure, while simultaneously improving film quality. As a result, PSCs incorporating 2DPh-4PACz achieved a power conversion efficiency (PCE) of 26.34% (certified 25.9%) and retained 96.9% of their initial PCE after 240 h of continuous UV irradiation, representing the best UV light stability reported to date. Additionally, extensive UV-aging experiments were conducted comparing with Ph-4PACz, confirming deuteration of SAMs as an effective strategy to improve UV resistivity. Moreover, these devices maintained 92.8% of their initial PCE after over 900 h of thermal aging at 85°C, and 73% after more than 1380 h at 80% relative humidity (RH). This deuterophenyl groups design strategy with π-conjugated extension offers a promising molecular design route for next-generation SAMs in high-performance, durable PSCs.

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Desheng Li, Junjie Zhao, Bitao Dong, Qunping Fan, Zedong Lin, Fan Wu, Xiangwen Guo, Bingsuo Zou, Yingguo Yang, Fei Zhang, Long Jiang, Wei Ma, Yuhang Liu, Kai Chen. Deuteration-functionalized self-assembled monolayers for UV-durable perovskite solar cells. InfoMat, 2026, 8 (7) : e70140 DOI:10.1002/inf2.70140

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