题目：

Reverse-Bias Breakdown Mechanisms and Mitigation Strategies in Perovskite Cells and Tandems

作者：

Yining Bao^1,2, Tianshu Ma^1,2, Yuqi Zhang^1,2, Luolei Shi^1,2, Linling Qin^1,2, Guoyang Cao^1,2,*, Changlei Wang^1,2,*, Xiaofeng Li^1,2,* and Zhenhai Yang^1,2,*

单位：

1 School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China.

2 Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China.

Abstract:

    As a promising photovoltaic technology, perovskite solar cells and tandems face the critical challenge of reverse-bias breakdown stability, which significantly hinders their commercialization. However, the fundamental mechanisms behind reverse-bias breakdown remain poorly understood. To address this, the underlying mechanisms of reverse-bias breakdown are systematically elucidated and targeted optimization strategies are proposed through a synergistic approach combining photoelectrical coupled simulations with well-designed experiments. Notably, it is identified that the reverse-bias breakdown is primarily governed by Zener tunneling, triggered by localized electric field amplification at the perovskite interfaces. Furthermore, misaligned energy band structures and ion migration further accelerate Zener breakdown and reduce the breakdown voltage. The pronounced ion accumulation of ion migration over extended operational periods also induces progressive degradation of device performance under fixed reverse bias over time. Additionally, narrow-bandgap perovskite cells exhibit significantly higher breakdown voltages but lower robustness than wide-bandgap perovskite cells, resulting in the breakdown characteristics of tandem cells being dominated by the narrow-bandgap perovskite sub-cells. These findings provide a solid theoretical basis for the design and industrialization of efficient and stable perovskite photovoltaics.

摘要：

  作为一种极具潜力的光伏技术，钙钛矿太阳电池及叠层电池面临反向偏压击穿稳定性这一关键挑战，严重阻碍了其商业化进程。然而，反向偏压击穿背后的基本机制迄今仍未得到清晰认识。为此，本研究采用光电耦合仿真与实验相结合的方法，系统揭示了反向偏压击穿的物理机制，并提出了针对性的优化策略。研究结果表明，反向偏压击穿主要由齐纳隧穿主导，而这一过程由钙钛矿界面处的局域电场增强所导致。此外，能带结构失配与离子迁移会进一步加剧齐纳击穿并显著降低击穿电压。在长期工作条件下，离子迁移造成的明显离子积累还将导致器件在固定反向偏压下性能随时间的推移逐渐衰减。另外，窄带隙钙钛矿电池的击穿电压显著高于宽带隙电池，但其稳定性较弱，因此叠层电池的击穿特性主要受窄带隙钙钛矿子电池所支配。以上成果为设计高效稳定的钙钛矿光伏器件并推动其产业化奠定了坚实的理论基础。

影响因子：19.4

分区情况：一区

链接: https://doi.org/10.1002/adfm.202524250