Transition from the Tetragonal to Cubic Phase of Organohalide Perovskite: The Role of Chlorine in Crystal Formation of CH3NH3PbI3 on TiO2 Substrates

Wang, Qiong, Lyu, Miaoqiang, Zhang, Meng, Yun, Jung-Ho, Chen, Hongjun and Wang, Lianzhou (2015) Transition from the Tetragonal to Cubic Phase of Organohalide Perovskite: The Role of Chlorine in Crystal Formation of CH3NH3PbI3 on TiO2 Substrates. Journal of Physical Chemistry Letters, 6 21: 4379-4384. doi:10.1021/acs.jpclett.5b01682


 
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Author Wang, Qiong
Lyu, Miaoqiang
Zhang, Meng
Yun, Jung-Ho
Chen, Hongjun
Wang, Lianzhou
Title Transition from the Tetragonal to Cubic Phase of Organohalide Perovskite: The Role of Chlorine in Crystal Formation of CH3NH3PbI3 on TiO2 Substrates
Journal name Journal of Physical Chemistry Letters   Check publisher's open access policy
ISSN 1948-7185
Publication date 2015-09-29
Year available 2015
Sub-type Article (original research)
DOI 10.1021/acs.jpclett.5b01682
Open Access Status Not yet assessed
Volume 6
Issue 21
Start page 4379
End page 4384
Total pages 6
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract The role of chlorine in the superior electronic property and photovoltaic performance of CH3NH3PbI(3-x)Clx perovskite has attracted recent research attention. Here, we study the impact of chlorine in the perspective of the crystal structure of the perovskite layer, which can provide important understanding of its excellent charge mobility and extended lifetimes. In particular, we find that in the presence of chlorine (PbCl2 or CH3NH3Cl), when CH3NH3PbI3 films are deposited on a TiO2 mesoporous layer instead of a planar TiO2 substrate, a stable cubic phase rather than the commonly observed tetragonal phase is formed in CH3NH3PbI3 perovskite at room temperature. The relative peak intensity of two major facets of cubic CH3NH3PbI3 crystals, (100)(C) and (200)(C) facets, can also be easily tuned, depending on the film thickness. Furthermore, compared with pristine CH3NH3PbI3 perovslcite films, in the presence of chlorine, CH3NH3PbI3 crystals grown on planar substrates exhibit strong preferred orientations on (110)(T) and (220)(T) facets.
Formatted abstract
The role of chlorine in the superior electronic property and photovoltaic performance of CH3NH3PbI(3–x)Clx perovskite has attracted recent research attention. Here, we study the impact of chlorine in the perspective of the crystal structure of the perovskite layer, which can provide important understanding of its excellent charge mobility and extended lifetimes. In particular, we find that in the presence of chlorine (PbCl2 or CH3NH3Cl), when CH3NH3PbI3 films are deposited on a TiO2 mesoporous layer instead of a planar TiO2 substrate, a stable cubic phase rather than the commonly observed tetragonal phase is formed in CH3NH3PbI3 perovskite at room temperature. The relative peak intensity of two major facets of cubic CH3NH3PbI3 crystals, (100)C and (200)C facets, can also be easily tuned, depending on the film thickness. Furthermore, compared with pristine CH3NH3PbI3 perovskite films, in the presence of chlorine, CH3NH3PbI3 crystals grown on planar substrates exhibit strong preferred orientations on (110)T and (220)T facets.
Keyword CH3NH3PbI3 perovskite
Phase transition
Tetragonal/cubic phase
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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