KBF4 Additive for Alleviating Microstrain, Improving Crystallinity, and Passivating Defects in Inverted Perovskite Solar Cells,Advanced Functional Materials

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KBF4 Additive for Alleviating Microstrain, Improving Crystallinity, and Passivating Defects in Inverted Perovskite Solar Cells
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-06-28 , DOI: 10.1002/adfm.202204880
Haiyang Cheng ₁ , Chunki Liu ₁ , Jing Zhuang ₁ , Jiupeng Cao ₁ , Tianyue Wang ₁ , Wai‐Yeung Wong _{2,

3} , Feng Yan _{1,

3}

Affiliation

Triple-cation mixed perovskites have attracted much attention recently owing to their prominent optoelectronic properties and good stability for perovskite solar cells. However, the introduction of those cations with different sizes in the perovskite materials will drive the perovskite lattice away from ideal cubic structure and lead to microstrain in the resultant films. Herein,a small amount of KBF₄ as an additive to elevate the quality of triple-cation mixed perovskite thin films is introduced. It is found that KBF₄ can enhance the crystallinity and alleviate microstrain of the perovskite thin films. Moreover, KBF₄ can passivate defects in perovskite grains, leading to much longer carrier lifetimes. Consequently, the resultant devices show improved fill factor, enhanced device efficiency, and better device stability. Under optimum fabrication conditions, triple-cation mixed perovskite solar cells with an inverted structure show power conversion efficiency over 23% as well as excellent stability under different conditions.

中文翻译：

KBF4 添加剂用于缓解倒置钙钛矿太阳能电池中的微应变、改善结晶度和钝化缺陷

三阳离子混合钙钛矿由于其突出的光电特性和良好的钙钛矿太阳能电池稳定性，近年来引起了广泛关注。然而，在钙钛矿材料中引入不同尺寸的阳离子会使钙钛矿晶格远离理想的立方结构，并导致所得薄膜产生微应变。本文介绍了少量KBF ₄作为添加剂以提高三阳离子混合钙钛矿薄膜的质量。发现KBF ₄可以提高钙钛矿薄膜的结晶度并减轻微应变。此外，KBF ₄可以钝化钙钛矿晶粒中的缺陷，从而延长载流子寿命。因此，所得器件显示出改进的填充因子、增强的器件效率和更好的器件稳定性。在最佳制造条件下，具有倒置结构的三阳离子混合钙钛矿太阳能电池显示出超过 23% 的功率转换效率以及在不同条件下的出色稳定性。

更新日期：2022-06-28

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