Efficient Inverted Perovskite Solar Cells Enabled by Sequential Passivation Using Two-Dimensional Perovskites

IF 24.5 Q1 CHEMISTRY, PHYSICAL
Bingcan Ke, Jing Li, Zewei Zhu, Siqi Zhang, Ruixuan Jiang, Chengkai Jin, Chang Hu, Qi Zhang, Jie Su, Sai Bai, Fuzhi Huang, Yi-Bing Cheng, Tongle Bu
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Abstract

Refining the process in which two-dimensional (2D) perovskites passivate three-dimensional (3D) perovskites is vital for improving the performance of perovskite solar cells (PSCs), yet is frequently overlooked. Herein, a novel sequential passivation process that initially employs phenethylamine iodide (PEAI) on the 3D perovskite surface, followed by treatment with 4-trifluoromethylphenylethylamine iodide (CF3PEAI) is presented. A comprehensive comparison of the intrinsic molecular structures and their impact on the perovskites reveals that the small-sized, low-polarized PEA molecule induces minimal lattice strain and a negative shift of the vacuum energy level of perovskite surface, whereas the large-sized, high-polarized CF3PEA molecule leads to larger lattice strain and a positive shift of the vacuum energy level. By leveraging the opposing properties of these molecules through our tailored sequential passivation strategy, optimal passivation effects and efficient interface charge transfer are obtained, outperforming the posttreatment with mixed ligands and greatly surpassing posttreatment with a single ligand. Consequently, a champion efficiency of 26.27% is achieved for the inverted PSCs, along with outstanding operational stability featuring a T80 lifetime exceeding 1000 h under continuous light illumination at the maximum power point tracking.

Abstract Image

利用二维钙钛矿序贯钝化实现高效倒置钙钛矿太阳能电池
改进二维(2D)钙钛矿钝化三维(3D)钙钛矿的工艺对于提高钙钛矿太阳能电池(PSCs)的性能至关重要,但经常被忽视。本文提出了一种新的顺序钝化工艺,首先在三维钙钛矿表面使用苯乙胺碘化(PEAI),然后用4-三氟甲基苯乙胺碘化(CF3PEAI)处理。综合比较了其固有分子结构及其对钙钛矿的影响,发现小尺寸、低极化的PEA分子导致钙钛矿表面晶格应变最小,真空能级负移,而大尺寸、高极化的CF3PEA分子导致较大的晶格应变和真空能级正移。通过我们量身定制的顺序钝化策略,利用这些分子的相反性质,获得了最佳的钝化效果和高效的界面电荷转移,优于混合配体后处理,大大超过了单一配体后处理。因此,倒置PSCs实现了26.27%的冠军效率,以及出色的运行稳定性,在最大功率点跟踪的连续光照下,T80寿命超过1000小时。
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