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Insight into ion-induced stability degradation in all-perovskite tandem photovoltaics: quantitative characterization and effective manipulation strategies.

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Title: Insight into ion-induced stability degradation in all-perovskite tandem photovoltaics: quantitative characterization and effective manipulation strategies.
Authors: Bao, Yining1,2 (AUTHOR), Ma, Tianshu1,2 (AUTHOR), Zhang, Yuqi1,2 (AUTHOR), Shi, Luolei1,2 (AUTHOR), Qin, Linling1,2 (AUTHOR), Wang, Changlei1,2 (AUTHOR), Cao, Guoyang1,2 (AUTHOR) gycao@suda.edu.cn, Li, Xiaofeng1,2 (AUTHOR) xfli@suda.edu.cn, Yang, Zhenhai1,2 (AUTHOR) zhyang@suda.edu.cn
Source: Science Bulletin. Jul2025, Vol. 70 Issue 14, p2285-2296. 12p.
Subjects: Ion migration & velocity, Photovoltaic power generation, Electric power production, Photoelectricity
Abstract: This study constructs a comprehensive optoelectronic simulation model coupled with ion migration, effectively characterizing ion migration effect in all-perovskite tandem solar cells through hysteresis index at fixed scan rates. The research reveals a dynamic equilibrium mechanism where the ion migration of all-perovskite tandem solar cells varies with the change of photogenerated currents in the two sub-cells. Additionally, a dual-light source compensation experimental testing protocol is proposed to validate this mechanism. Finally, by monitoring the stable power output of tandem cells under different light compensation conditions, it is confirmed that the ion migration in the current-limited sub-cells plays a dominant role in the stability and power output of tandem solar cells. [Display omitted] Ion-induced stability degradation is a critical factor limiting the power conversion efficiency and commercialization potential of perovskite-based solar cells. To mitigate ion migration in perovskite-based devices, various strategies, including defect passivation and ion optimization, have been extensively investigated from the device fabrication and integration perspectives, which, however, are often costly and may negatively impact device efficiency. Notably, all-perovskite tandem solar cells (TSCs), which exhibit more complex ion dynamics compared to single-junction devices, remain poorly understood. In this study, we employ comprehensive photoelectric coupling simulations in conjunction with a self-assembled light source compensation setup to elucidate ion dynamics in all-perovskite TSCs. Specifically, the hysteresis behavior at a defined scan rate is used to quantitatively characterize the extent of ion migration. Our findings reveal that enhanced ion migration occurs in current-limited sub-cells, whereas ion migration in higher-current sub-cells is attenuated due to differential voltage assignments. This study provides valuable insights into the device physics of ion migration in TSCs, facilitating effective control of ion behavior and offering essential guidance for the design of highly efficient and stable TSCs. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This study constructs a comprehensive optoelectronic simulation model coupled with ion migration, effectively characterizing ion migration effect in all-perovskite tandem solar cells through hysteresis index at fixed scan rates. The research reveals a dynamic equilibrium mechanism where the ion migration of all-perovskite tandem solar cells varies with the change of photogenerated currents in the two sub-cells. Additionally, a dual-light source compensation experimental testing protocol is proposed to validate this mechanism. Finally, by monitoring the stable power output of tandem cells under different light compensation conditions, it is confirmed that the ion migration in the current-limited sub-cells plays a dominant role in the stability and power output of tandem solar cells. [Display omitted] Ion-induced stability degradation is a critical factor limiting the power conversion efficiency and commercialization potential of perovskite-based solar cells. To mitigate ion migration in perovskite-based devices, various strategies, including defect passivation and ion optimization, have been extensively investigated from the device fabrication and integration perspectives, which, however, are often costly and may negatively impact device efficiency. Notably, all-perovskite tandem solar cells (TSCs), which exhibit more complex ion dynamics compared to single-junction devices, remain poorly understood. In this study, we employ comprehensive photoelectric coupling simulations in conjunction with a self-assembled light source compensation setup to elucidate ion dynamics in all-perovskite TSCs. Specifically, the hysteresis behavior at a defined scan rate is used to quantitatively characterize the extent of ion migration. Our findings reveal that enhanced ion migration occurs in current-limited sub-cells, whereas ion migration in higher-current sub-cells is attenuated due to differential voltage assignments. This study provides valuable insights into the device physics of ion migration in TSCs, facilitating effective control of ion behavior and offering essential guidance for the design of highly efficient and stable TSCs. [ABSTRACT FROM AUTHOR]
ISSN:20959273
DOI:10.1016/j.scib.2025.04.005