期刊
ADVANCED MATERIALS
卷 32, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001107
关键词
coatings; decomposition pathways; intermediate superstructures; organic-inorganic hybrid perovskites; suppression of degradation
类别
资金
- Key-Area Research and Development Program of Guangdong Province [2018B010109009]
- National Key R&D Program of China [2016YFA0300804, 2016YFA0300903, 2016YFA0201001]
- National Natural Science Foundation of China [51672007, 11974023, 51575135, U1537206, 11772207, 11327902]
- National Equipment Program of China [ZDYZ2015-1]
- Natural Science Foundation of Hebei Province [A2019210204]
- High Level Talent Support Project in Hebei [A2017002034, C201821]
- SIAT Innovation Program for Excellent Young Researchers, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics [MCMS-E-0519G04]
- China Scholarship Council (CSC)
- Youth Top-notch Talents Supporting Plan of Hebei Province
- 2011 Program Peking-Tsinghua-IOP Collaborative Innovation Center of Quantum Matter
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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