The presence of redox reactions due to slow-moving ions at perovskite/contact interfaces is a major concern for the long-term stability of perovskite solar cells. In this work, we have evidently demonstrated the contribution of K+ ions on the removal of these non-capacitive effects that primarily accelerate the degradation mechanism in the devices. The intermittent current–voltage characteristics at the short-circuit conditions elucidate the role of K+ ions on reducing the rapid degradation at the interfaces due to the chemical reactivity of the accumulated ions by eliminating the burn-in decay in the photocurrent. Dark current–voltage measurements, time-resolved staircase voltammetry, and electrochemical impedance spectroscopy verified that both capacitive and non-capacitive currents, consequence of slow ion migration, are reduced by the incorporation of K+. Thus, this work signifies how K+ incorporation diminishes the internal degradation and enhances intrinsic stability of perovskite solar cells.

中文翻译：

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通过在钙钛矿太阳能电池中掺入钾来消除非电容效应

由于钙钛矿/接触界面处缓慢移动的离子而导致的氧化还原反应的存在是钙钛矿太阳能电池长期稳定性的主要问题。在这项工作中，我们已经清楚地证明了 K+ 离子对消除这些主要加速器件退化机制的非电容效应的贡献。短路条件下的间歇电流-电压特性阐明了 K+ 离子通过消除光电流中的老化衰减来减少由于累积离子的化学反应性而导致的界面快速降解的作用。暗电流-电压测量、时间分辨阶梯伏安法和电化学阻抗谱验证了电容性和非电容性电流，缓慢离子迁移的结果，通过加入 K+ 而减少。因此，这项工作表明 K+ 掺入如何减少内部降解并增强钙钛矿太阳能电池的内在稳定性。