Mobile iodides capture for highly photolysis- and reverse-bias-stable perovskite solar cells

Xiaoxue Ren; Jifei Wang; Yun Lin; Yingwei Wang; Haipeng Xie; Han Huang; Bin Yang; Yanfa Yan; Yongli Gao; Jun He; Jinsong Huang; Yongbo Yuan

doi:10.1038/s41563-024-01876-2

Mobile iodides capture for highly photolysis- and reverse-bias-stable perovskite solar cells

Nat Mater. 2024 Apr 29. doi: 10.1038/s41563-024-01876-2. Online ahead of print.

Authors

Xiaoxue Ren^#^{1

2}, Jifei Wang^#^{1

2}, Yun Lin², Yingwei Wang², Haipeng Xie¹, Han Huang^{1

2}, Bin Yang³, Yanfa Yan⁴, Yongli Gao⁵, Jun He^{6

7}, Jinsong Huang⁸, Yongbo Yuan^{9

10}

Affiliations

¹ Hunan Key Laboratory of Super Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, P.R. China.
² Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, P.R. China.
³ College of Materials Science and Engineering, Hunan University, Changsha, P.R. China.
⁴ Department of Physics and Astronomy, Wright Center for Photovoltaics Innovation and Commercialization, University of Toledo, Toledo, OH, USA.
⁵ Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA.
⁶ Hunan Key Laboratory of Super Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, P.R. China. junhe@csu.edu.cn.
⁷ Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, P.R. China. junhe@csu.edu.cn.
⁸ Department of Applied Physical Sciences, University of North Carolina, Chapel Hill, NC, USA. jhuang@unc.edu.
⁹ Hunan Key Laboratory of Super Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, P.R. China. yuanyb@csu.edu.cn.
¹⁰ Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, P.R. China. yuanyb@csu.edu.cn.

^# Contributed equally.

PMID: 38684883
DOI: 10.1038/s41563-024-01876-2

Abstract

For halide perovskites that are susceptible to photolysis and ion migration, iodide-related defects, such as iodine (I₂) and iodine vacancies, are inevitable. Even a small number of these defects can trigger self-accelerating chemical reactions, posing serious challenges to the durability of perovskite solar cells. Fortunately, before I₂ can damage the perovskites under illumination, they generally diffuse over a long distance. Therefore, detrimental I₂ can be captured by interfacial materials with strong iodide/polyiodide (I_x^-) affinities, such as fullerenes and perfluorodecyl iodide. However, fullerenes in direct contact with perovskites fail to confine I_x^- ions within the perovskite layer but cause detrimental iodine vacancies. Perfluorodecyl iodide, with its directional I_x^- affinity through halogen bonding, can both capture and confine I_x^-. Therefore, inverted perovskite solar cells with over 10 times improved ultraviolet irradiation and thermal-light stabilities (under 85 °C and 1 sun illumination), and 1,000 times improved reverse-bias stability (under ISOS-V ageing tests) have been developed.

Abstract

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