Highly efficient and stable 2D/3D perovskite solar cells based on surface reconstruction and energy level alignment

IF 10.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Science China Chemistry Pub Date : 2024-08-06 DOI:10.1007/s11426-024-2115-y

Qiaohui Li, Hang Liu, Tong Zhou

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Abstract

Realizing simultaneous adjustment of energy levels and work functions in two-dimensional/three-dimensional (2D/3D) perovskite solar cells (PSCs) is a challenge. Here, a pseudohalide 3,5-bis (trifluoromethyl) benzylammonium tetrafluoroborate (TF-PMABF₄) was used to react with unreacted PbI₂ on the surface of 3D bulky perovskite to form a mixed halide of 2D perovskite denoted (TF-PMA)₂FA₂Pb₃I₈(BF₄)₂. This novel 2D/3D perovskite enables the simultaneous adjustment of energy levels and work functions on the surface of active layers. Due to the significantly enhanced quality of 2D/3D perovskite film, decreased surface defects and increased charge carrier lifetime, the 2D/3D PSCs exhibit an outstanding power conversion efficiency (PCE) of 25.15% and a high V_OC of 1.194 V. Importantly, 2D/3D PSCs exhibit remarkable enhancements in environmental stability, unencapsulated devices retaining more than 90% of their initial PCE at 50% humidity for 2,280 h.

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基于表面重构和能级排列的高效稳定的二维/三维过氧化物太阳能电池

在二维/三维（2D/3D）包晶太阳能电池（PSCs）中实现能级和功函数的同步调节是一项挑战。在这里，我们使用了一种假卤化物 3,5-双（三氟甲基）苄基铵四氟硼酸盐（TF-PMABF4）与三维大体积包晶表面未反应的 PbI2 发生反应，形成一种二维包晶混合卤化物，命名为 (TF-PMA)2FA2Pb3I8(BF4)2。这种新型 2D/3D 包晶能够同时调整活性层表面的能级和功函数。重要的是，2D/3D PSCs 的环境稳定性有了显著提高，未封装器件在 50%湿度条件下可在 2280 小时内保持 90% 以上的初始 PCE。

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来源期刊

Science China Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

14.40

自引率

7.30%

发文量

3787

审稿时长

2.2 months

期刊介绍： Science China Chemistry, co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China and published by Science China Press, publishes high-quality original research in both basic and applied chemistry. Indexed by Science Citation Index, it is a premier academic journal in the field. Categories of articles include: Highlights. Brief summaries and scholarly comments on recent research achievements in any field of chemistry. Perspectives. Concise reports on thelatest chemistry trends of interest to scientists worldwide, including discussions of research breakthroughs and interpretations of important science and funding policies. Reviews. In-depth summaries of representative results and achievements of the past 5–10 years in selected topics based on or closely related to the research expertise of the authors, providing a thorough assessment of the significance, current status, and future research directions of the field.