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

被引：64

作者：

Chen, Shulin ^{[1
,2
]}

Zhang, Ying ^{[3
]}

Zhang, Xiaowei ^{[4
]}

Zhao, Jinjin ^{[3
]}

Zhao, Zewen ^{[3
]}

Su, Xiao ^{[3
]}

Hua, Ze ^{[2
]}

Zhang, Jingmin ^{[2
]}

Cao, Jian ^{[1
]}

Feng, Jicai ^{[1
]}

Wang, Xiao ^{[5
]}

Li, Xinzheng ^{[6
]}

Qi, Junlei ^{[1
]}

Li, Jiangyu ^{[5
]}

Gao, Peng ^{[2
,4
,6
]}

机构：

[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China

[2] Peking Univ, Sch Phys, Electron Microscopy Lab, Beijing 100871, Peoples R China

[3] Shijiazhuang Tiedao Univ, Sch Mech Engn, Sch Mat Sci & Engn, Shijiazhuang 050043, Hebei, Peoples R China

[4] Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China

[5] Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen Key Lab Nanobiomech, Shenzhen 518055, Peoples R China

[6] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

来源：

ADVANCED MATERIALS | 2020年 / 32卷 / 29期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

coatings; decomposition pathways; intermediate superstructures; organic-inorganic hybrid perovskites; suppression of degradation; IN-SITU OBSERVATION; RADIATION-DAMAGE; SOLAR-CELLS; INDUCED DEGRADATION; HALIDE PEROVSKITES; TEM; LIGHT; EFFICIENCY; IRRADIATION; SPECIMENS;

D O I：

10.1002/adma.202001107

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页数：7

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