Статья

High‐Performance Tin–Lead Mixed‐Perovskite Solar Cells with Vertical Compositional Gradient

Jiupeng CaoDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. ChinaHok‐Leung LoiDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. ChinaYang XuDivision of Integrative Systems and Design Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR P. R. ChinaXuyun GuoDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. ChinaNaixiang WangDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. ChinaChun‐Ki LiuDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. ChinaTianyue WangDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. ChinaHaiyang ChengDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. ChinaYe ZhuDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. ChinaMitch Guijun LiDivision of Integrative Systems and Design Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR P. R. ChinaWai‐Yeung WongDepartment of Applied Biology & Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University Hong Kong P. R. ChinaFeng YanDepartment of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong SAR P. R. China

2021en

ABI

Аннотация

Abstract Sn–Pb mixed perovskites with bandgaps in the range of 1.1–1.4 eV are ideal candidates for single‐junction solar cells to approach the Shockley–Queisser limit. However, the efficiency and stability of Sn–Pb mixed‐perovskite solar cells (PSCs) still lag far behind those of Pb‐based counterparts due to the easy oxidation of Sn 2+ . Here, a reducing agent 4‐hydrazinobenzoic acid is introduced as an additive along with SnF 2 to suppress the oxidation of Sn 2+ . Meanwhile, a vertical Pb/Sn compositional gradient is formed spontaneously after an antisolvent treatment due to different solubility and crystallization kinetics of Sn‐ and Pb‐based perovskites and it can be finely tuned by controlling the antisolvent temperature. Because the band structure of a perovskite is dependent on its composition, graded vertical heterojunctions are constructed in the perovskite films with a compositional gradient, which can enhance photocarrier separation and suppress carrier recombination in the resultant PSCs. Under optimal fabrication conditions, the Sn–Pb mixed PSCs show power conversion efficiency up to 22% along with excellent stability during light soaking.

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Идентификаторы

DOI: 10.1002/adma.202107729

Цитирования и источники

Цитирований: 2Использованных источников: 0

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