DataVXAdvanced MaterialsPaper
journal article·2020-07

General Decomposition Pathway of Organic–Inorganic Hybrid Perovskites through an Intermediate Superstructure and its Suppression Mechanism

Shulin Chen, Ying Zhang, Xiaowei Zhang, Jinjin Zhao, Zewen Zhao, Xiao Su, Ze Hua, Jingmin Zhang, Jian Cao, Jicai Feng, Xiao Wang, Xinzheng Li, Junlei Qi, Jiangyu Li, Peng Gao

Advanced Materials· Volume 32· Issue 29
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Source abstract

Abstract

Abstract Organic–inorganic hybrid perovskites (OIHPs) have generated considerable excitement due to their promising photovoltaic performance. However, the commercialization of perovskite solar cells (PSCs) is still plagued by the structural degradation of the OIHPs. Here, the decomposition mechanism of OIHPs under electron beam irradiation is investigated via transmission electron microscopy, and a general decomposition pathway for both tetragonal CH3NH3PbI3 and cubic CH3NH3PbBr3 is uncovered through an intermediate superstructure state of CH3NH3PbX2.5, X = I, Br, with ordered vacancies into final lead halides. Such decomposition can be suppressed via carbon coating by stabilization of the perovskite structure framework. These findings reveal the general degradation pathway of OIHPs and suggest an effective strategy to suppress it, and the atomistic insight learnt may be useful for improving the stability of PSCs.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China

Electron Microscopy Laboratory School of Physics Peking University Beijing 100871 China

School of Materials Science and Engineering School of Mechanical Engineering Shijiazhuang Tiedao University Shijiazhuang 050043 China

International Center for Quantum Materials School of Physics Peking University Beijing 100871 China

Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China

Collaborative Innovation Center of Quantum Matter Beijing 100871 China

Funding

National Basic Research Program of China · National Natural Science Foundation of China · Natural Science Foundation of Hebei Province · State Key Laboratory of Mechanics and Control of Mechanical Structures · Nanjing University of Aeronautics and Astronautics · China Scholarship Council

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