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Surface Analytical Investigation on Organometal Triiodide Perovskite

Published online by Cambridge University Press:  31 May 2016

Youzhen Li ,
Xuemei Xu ,
Chenggong Wang ,
Congong Wang ,
Fangyan Xie ,
Jinsong Huang  and
Yongli Gao
Youzhen Li
Affiliation:
School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, P.R. China
Xuemei Xu
Affiliation:
School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, P.R. China
Chenggong Wang
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester, NY, 14627, USA
Congong Wang
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester, NY, 14627, USA
Fangyan Xie
Affiliation:
Instrumental Analysis Center, Sun Yat-Sen University, Guangzhou, 510275, P.R. China
Jinsong Huang
Affiliation:
Department of Mechanical and Materials Engineering and Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0656, USA
Yongli Gao*
Affiliation:
Department of Physics and Astronomy, University of Rochester, Rochester, NY, 14627, USA
*
*E-mail: ygao@pas.rochester.edu
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Abstract

Lead halide perovskites have proven their great power conversion efficiency (PCE) in the last few years and attracted more and more attentions. Evaporation is an important method to get high quality perovskite films, especially for surface and interface investigation, which is important for the solar cell performance. In this paper, we present our investigations on growing PbI2 and CH3NH3I films by evaporation, and then CH3NH3PbI3 films by co-evaporation. X-ray photoemisson spectroscopy (XPS) was used to characterize the films. The results showed that CH3NH3I film was not stable in vacuum. Both N and I decreased in vacuum with time elapsing. PbI2 and CH3NH3PbI3 films are quite stable. The atomic ratio of CH3NH3PbI3 films (C: N: Pb: I =1.29:1.07:1.00:2.94) is very close to the ideal CH3NH3PbI3, which indicates that evaporation is a good method to get high quality perovskite films with accurate atomic ratio.

Keywords

photoemissionphotovoltaicthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1735: Symposium S/W/CC – Advanced Materials for Photovoltaic, Fuel Cell and Electrolyzer, and Thermoelectric Energy Conversion , 2015 , mrsf14-1735-w11-06
Copyright
Copyright © Materials Research Society 2016 

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References

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