Real‐Time In Situ Observation of Microstructural Change in Organometal Halide Perovskite Induced by Thermal Degradation,Advanced Functional Materials

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Real‐Time In Situ Observation of Microstructural Change in Organometal Halide Perovskite Induced by Thermal Degradation
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-09-02 , DOI: 10.1002/adfm.201804039
Tae Woong Kim ₁ , Naoyuki Shibayama ₁ , Ludmila Cojocaru ₂ , Satoshi Uchida ₃ , Takashi Kondo _{3,

4} , Hiroshi Segawa _{1,

3}

Affiliation

Organometal halide perovskites have demonstrated remarkable achievements in solar cell applications and have attracted tremendous attention as next‐generation photovoltaic materials. Regardless of the unprecedented success, the degradation of the perovskite has caused the performance of the perovskite solar cells to be unreliable and prevented their commercialization. However, the detailed degradation mechanism of the perovskite has yet to be elucidated. In this study, the entire procedure of the thermally induced degradation of methylammonium lead iodide (MAPbI₃) is reported using real‐time in situ transmission electron microscopy. The in situ investigation directly illustrates the detailed process of precipitating trigonal PbI₂ grains during thermal degradation and confirms that trigonal PbI₂ is precipitated from the amorphized MAPbI₃ layer via intermediate states. The intermediate states and their stackings enable the generation of 3D linear‐empty spaces that can be utilized as passages by elements during the decomposition and intercalation of the perovskite. This report will provide critical clues for the commercialization of the perovskite‐based solar cells and for further investigation of the synthesis of the perovskite, which is not fully understood.

中文翻译：

实时观察热降解引起的有机金属卤化物钙钛矿微结构变化

有机金属卤化物钙钛矿已在太阳能电池应用中取得了显著成就，并作为下一代光伏材料引起了极大的关注。尽管取得了空前的成功，但是钙钛矿的降解已经导致钙钛矿太阳能电池的性能不可靠并阻止了其商业化。然而，钙钛矿的详细降解机理尚未阐明。在这项研究中，使用实时原位透射电子显微镜报道了热诱导降解甲基铵碘化铅（MAPbI ₃）的整个过程。原位研究直接说明了沉淀三角形PbI ₂的详细过程热降解过程中晶粒和确认三角碘化铅₂被从沉淀非晶化MAPbI ₃经由中间状态层。中间状态及其堆叠使得能够生成3D线性空空间，该空间可在钙钛矿的分解和嵌入过程中用作元素的通道。该报告将为基于钙钛矿的太阳能电池的商业化以及对钙钛矿的合成的进一步研究提供关键线索，目前尚不完全清楚。

更新日期：2018-09-02

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