电流失配对全钙钛矿叠层太阳能电池中离子迁移的遮蔽效应

doi:10.1016/j.actphy.2026.100278

Abstract

Abstract: The intrinsic ionic characteristics of metal halide hybrid perovskite materials represent a critical factor limiting the long-term operational stability and reliability of perovskite solar cells. Compared with traditional photovoltaic materials, perovskite features a soft crystal lattice with weak ionic bonding, which enables the migration of mobile ions. Due to the slow response characteristics of mobile ions and the electric field shielding effect, PSCs exhibit hysteresis in current density–voltage measurements. This phenomenon not only reduces the accuracy of efficiency evaluation, but also leads to unstable output during practical operation and even affects the long-term stability of the devices, thereby posing a significant obstacle to the commercialization of perovskite photovoltaic technology. In two-terminal perovskite tandem solar cells, the operating mechanism is more complex. Their series structure requires current matching between the two subcells. Current mismatch causes each subcell to contribute differently to the overall performance, thereby introducing additional complexity to the analysis of ion migration, charge accumulation, and hysteresis behavior. In this study, by constructing a comprehensive opto-electro-ionic model, the ionic dynamics and hysteresis characteristics of all-perovskite TSCs under different current matching conditions were systematically analyzed. The results show that when the subcells are currentmatched, the hysteresis effect is dominated by the subcell with higher ion density; when the subcells are current-mismatched, the hysteresis effect is dominated by the “current-limiting” subcell with smaller shortcircuit current density, while the ionic behavior in the other subcell is “obscured”, and shows no contribution to the overall hysteresis. Additionally, the impact of interface defects at the perovskite/hole transport layer on the hysteresis is greater than that at the perovskite/electron transport layer in inverted-structure perovskite TSCs. Therefore, implementing precise interface passivation and ion suppression strategies for the “currentlimiting” subcell is the optimal approach to reduce device hysteresis and enhance performance. The results in this work offer a guideline to optimize two subcells and multiple interfaces, dramatically reducing both experimental costs and trial-and-error efforts. By enabling more targeted and economical refinement, the study accelerates the path toward industrial production of stable, high-efficiency all-perovskite tandem solar cells.

Key words: All-perovskite tandem solar cells, Hysteresis effect, Current mismatch, Ion dynamics

Dapeng Geng, Fan Li, Zhaosheng Xia, Gang Wang, Feihong Ye, Zhiliang Chen, Jian Mao, Xuanhua Li, Xingang Ren, Zhixiang Huang. Obscuring effect of current mismatch on ion migration in allperovskite tandem solar cells[J]. Acta Phys. -Chim. Sin. 2026, (), 100278. doi: 10.1016/j.actphy.2026.100278

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Obscuring effect of current mismatch on ion migration in allperovskite tandem solar cells

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