Self-passivation of low-dimensional hybrid halide perovskites guided by structural characteristics and degradation kinetics,Energy & Environmental Science

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Self-passivation of low-dimensional hybrid halide perovskites guided by structural characteristics and degradation kinetics
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-2-9 , DOI: 10.1039/d0ee03836a
Ke Meng _{1,

2,

3,

4} , Xiao Wang _{1,

2,

3,

4} , Zhimin Li _{1,

2,

3,

4} , Zhou Liu _{1,

2,

3,

4} , Zhi Qiao _{1,

2,

3,

4} , Chunwu Wang _{1,

2,

3,

4} , Youdi Hu _{1,

2,

3,

4} , Shunde Li _{1,

2,

3,

4} , Lei Cheng _{1,

2,

3,

4} , Yufeng Zhai _{1,

2,

3,

4} , Gang Chen _{1,

2,

3,

4}

Affiliation

Low-dimensional perovskite (LDP) holds great potential to deliver highly stable and efficient solar cells. However, a fundamental understanding of the structure, composition and degradation mechanism of the LDP material is required for further advancements. Here, we present an effective self-passivation strategy to concurrently enhance the efficiency and stability of the butylammonium (BA) based LDP solar cells. It is inspired and guided by the structural characteristics and degradation kinetics of the LDP film. We show that the BA-based LDP film possesses a unique crystal stacking pattern, containing highly oriented perovskite crystals of different layer thicknesses. We also uncover the divergent degradation behaviour of the LDP film under thermal stress and the unique disproportion degradation process under high-humidity conditions. Without introducing foreign compounds, the LDP film is passivated with a thin layer of the BA-based perovskite, which results in an exceptional power conversion efficiency of 17.0% and significantly enhanced device stability. These studies provide mechanistic insight into the structure and stability of the LDP material and offer guidelines for further device optimization.

中文翻译：

低维杂化卤化物钙钛矿的自钝化受结构特征和降解动力学的指导

低维钙钛矿（LDP）具有生产高稳定性和高效率太阳能电池的巨大潜力。但是，需要对LDP材料的结构，组成和降解机理有基本的了解，以进一步发展。在这里，我们提出了一种有效的自钝化策略，以同时提高基于丁基铵（BA）的LDP太阳能电池的效率和稳定性。它受到LDP膜的结构特征和降解动力学的启发和指导。我们表明，基于BA的LDP膜具有独特的晶体堆叠模式，其中包含具有不同层厚度的高度取向的钙钛矿晶体。我们还揭示了在热应力下LDP膜的不同降解行为，以及在高湿度条件下独特的歧化降解过程。在不引入外来化合物的情况下，LDP膜被BA基钙钛矿的薄层钝化，这导致了17.0％的出色功率转换效率并显着增强了器件的稳定性。这些研究为LDP材料的结构和稳定性提供了机械方面的见识，并为进一步优化器件提供了指导。

更新日期：2021-03-02

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