Balancing Lattice Strain by Embedded Ionic Liquid for the Stabilization of Formamidinium-Based Perovskite Solar Cells,ACS Applied Materials & Interfaces

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Balancing Lattice Strain by Embedded Ionic Liquid for the Stabilization of Formamidinium-Based Perovskite Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-09-13 , DOI: 10.1021/acsami.2c11677
Chenhui Duan ₁ , Zihui Liang ₁ , Jinguo Cao ₁ , Bowen Jin ₁ , Yidong Ming ₁ , Shimin Wang ₁ , Binghe Ma ₂ , Tao Ye ₂ , Congcong Wu ₁

Affiliation

Formamidinium (FA)-based perovskites remained state-of-the-art in the field of perovskite solar cells (PSCs) owing to the exceptional absorption and carrier transport properties, while the transition from photoactive (α-) to photoinactive (δ-FAPbI₃) phase is the impediment that causes performance degradation and thus limits the deployment of FA-based PSCs. The unfavorable phase transition originates from tensile strain in the FAPbI₃ crystal lattice, which undergoes structural reorganization for lattice strain balancing. In this work, we found that the ionic liquid (IL) could be used as the strain coordinator to balance the lattice strain for stability improvement of FAPbI₃ perovskite. We theoretically studied the electronic coupling between IL and FAPbI₃ and unraveled the originality of the IL-induced compressive strain. The strain-relaxed α-FAPbI₃ by IL showed robust stability against environmental factors, which can withstand ambient aging for 40 days without any phase transition or decomposition. Moreover, the strain-relaxed perovskite films showed a lower trap density and resulted in conversion efficiency improvement from 18.27 to 19.88%. Based on this novel strain engineering strategy, the unencapsulated PSCs maintained 90% of their initial efficiency under ambient-air aging for 50 days.

中文翻译：

通过嵌入离子液体平衡晶格应变以稳定甲脒基钙钛矿太阳能电池

由于出色的吸收和载流子传输特性，基于甲脒 (FA) 的钙钛矿在钙钛矿太阳能电池 (PSC) 领域仍然是最先进的，而从光活性 (α-) 转变为光非活性 (δ-FAPbI) ₃ ) 阶段是导致性能下降的障碍，因此限制了基于 FA 的 PSC 的部署。不利的相变源于FAPbI ₃晶格中的拉伸应变，其经历了用于晶格应变平衡的结构重组。在这项工作中，我们发现离子液体（IL）可以用作应变协调剂来平衡晶格应变，从而提高FAPbI ₃钙钛矿的稳定性。我们从理论上研究了 IL 和 FAPbI 之间的电子耦合₃并揭示了 IL 引起的压缩应变的独创性。IL的应变松弛 α-FAPbI ₃对环境因素表现出强大的稳定性，可以承受环境老化 40 天而没有任何相变或分解。此外，应变松弛的钙钛矿薄膜显示出较低的陷阱密度，并导致转换效率从 18.27% 提高到 19.88%。基于这种新颖的应变工程策略，未封装的 PSC 在环境空气老化 50 天下保持其初始效率的 90%。

更新日期：2022-09-13

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