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Title of Journal: Nano Res

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Abbravation: Nano Research

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Tsinghua University Press

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DOI

10.1007/978-94-007-2872-1_5

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1998-0000

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Methylammonium cation deficient surface for enhanc

Authors: Xin Xu Kai Li Zhenzhong Yang Jiangjian Shi Dongmei Li Lin Gu Zhijian Wu Qingbo Meng
Publish Date: 2016/11/12
Volume: 10, Issue: 2, Pages: 483-490
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Abstract

Heterojunction interfaces in perovskite solar cells play an important role in enhancing their photoelectric properties and stability Till date the precise lattice arrangement at TiO2/CH3NH3PbI3 heterojunction interfaces has not been investigated clearly Here we examined a TiO2/CH3NH3PbI3 interface and found that a heavy atomic layer exists in such interfaces which is attributed to the vacancies of methylammonium MA cation groups Further firstprinciples calculation results suggested that an MA cationdeficient surface structure is beneficial for a strong heterogeneous binding between TiO2 and CH3NH3PbI3 to enhance the interface stability Our research is helpful for further understanding the detailed interface atom arrangements and provides references for interfacial modification in perovskite solar cellsThe authors would like to acknowledge the financial support from the National Basic Research Program of China Nos 2012CB932903 and 2012CB932904 National Natural Science Foundation of China Nos 51402348 11474333 91433205 51421002 91233202 and 21173260 and the Knowledge Innovation Program of the Chinese Academy of Sciences

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