Ion Migration Accelerated Reaction between Oxygen and Metal Halide Perovskites in Light and Its Suppression by Cesium Incorporation,Advanced Energy Materials

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Ion Migration Accelerated Reaction between Oxygen and Metal Halide Perovskites in Light and Its Suppression by Cesium Incorporation
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-01-15 , DOI: 10.1002/aenm.202002552
Dongxu Lin ₁ , Tingting Shi ₂ , Haipeng Xie ₁ , Fang Wan ₁ , Xiaoxue Ren ₁ , Kai Liu ₁ , Yuan Zhao ₁ , Lili Ke ₁ , Yun Lin ₁ , Yongli Gao _{1,

3} , Xin Xu ₂ , Weiguang Xie ₂ , Pengyi Liu ₂ , Yongbo Yuan _{1,

4}

Affiliation

Organic‐inorganic hybrid perovskite solar cells are susceptible to multiple influencing factors such as moisture, oxygen, heat stress, ion migration. Given the complex practical working conditions for solar cells, a fundamental question is how different failure mechanisms collaborate and substantially accelerate the device degradation. In this study, it is found that ion migration can accelerate the reaction between oxygen and methylammonium lead iodide perovskite in light conditions. This is suggested since regions with local electric fields suffer from more severe decomposition. Here it is reported that cesium ions (Cs⁺) incorporated in perovskite lattice, with a moderate doping concentration (e.g. 5%), can function as stabilizers to efficiently interrupt such a synergistic effect between oxygen induced degradation and ion migration while retaining the high performance of perovskite solar cells. Both experimental and theoretical results suggest that 5% Cs⁺ ions incorporation simultaneously suppresses the formation of reactive superoxide ions (

O_{2}^{-}

) as well as ion migration in perovskites by forming additional energy barriers. This A‐site cations engineering is also a promising strategy to circumvent the detrimental effect of oxygen molecules in FA‐based perovskites, which is important for developing high‐efficiency perovskite solar cells with enhanced stability.

中文翻译：

氧与金属卤化物钙钛矿在光中的离子迁移加速反应及其对铯掺入的抑制

有机-无机混合钙钛矿太阳能电池易受多种影响因素的影响，例如水分，氧气，热应力，离子迁移。考虑到太阳能电池的复杂实际工作条件，一个基本问题是不同的故障机制如何协作并实质上加速器件的退化。在这项研究中，发现离子迁移可以在光条件下加速氧与甲基铵碘化铅钙钛矿之间的反应。这被建议是因为具有局部电场的区域遭受更严重的分解。据报道，铯离子（Cs ⁺以适中的掺杂浓度（例如5％）掺入钙钛矿晶格中的Al 2 O 3可以用作稳定剂，以有效地中断氧诱导的降解和离子迁移之间的这种协同效应，同时保持钙钛矿太阳能电池的高性能。实验和理论结果均表明5％的Cs ⁺离子的结合同时抑制了反应性超氧离子的形成（