Issue 21, 2018
From the journal:

RSC Advances

Investigation on the structural, morphological, electronic and photovoltaic properties of a perovskite thin film by introducing lithium halide†

Zhenhua Lin,‡a   Hai Zhu,‡b   Long Zhou,a   Jianhui Du,a   Chunfu Zhang, ORCID logo a   Qing-Hua Xu,b   Jingjing Chang, ORCID logo *a   Jianyong Ouyang ORCID logo c  and  Yue Haoa  

* Corresponding authors

a State Key Laboratory of Wide Band Gap Semiconductor Technology, Shaanxi Joint Key Laboratory of Graphene, School of Microelectronics, Xidian University, 2 South Taibai Road, Xi'an, China 710071
E-mail: jjingchang@xidian.edu.cn

b Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543

c Department of Materials Science and Engineering, National University of Singapore, 7 Engineering Drive 1, Singapore 117574

Abstract

The performance of perovskite solar cells (PSCs) including device efficiency and stability is mainly dependent on the perovskite film properties which are critically related to the organic cations used. Herein, we studied the role that the inorganic lithium (Li) cation played in perovskite thin films and its influence on crystal growth, film properties, and device performance. We found that within the threshold limit of a 1.0% molar ratio, the Li dopant had a positive effect on the film formation and properties. However, after replacing more MA+ with Li+, the device performance was degraded significantly with reduced short-circuit current density (Jsc) and fill factor (FF) values. With a doping ratio of 10 mol%, the film morphology, crystallinity, photophysical, and electronic properties totally changed due to the unstable nature of the Li doped, distorted 3-D perovskite structure. The Li doping mechanism was discussed, and it was thought to contain two different doping mechanisms. One is interstitial doping at the much lower doping ratio, and the other is substitutional doping for the MA cation at the higher doping ratio.

Graphical abstract: Investigation on the structural, morphological, electronic and photovoltaic properties of a perovskite thin film by introducing lithium halide

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Article information

DOI
https://doi.org/10.1039/C8RA01199K
Article type
Paper
Submitted
07 Feb 2018
Accepted
08 Mar 2018
First published
22 Mar 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 11455-11461

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Investigation on the structural, morphological, electronic and photovoltaic properties of a perovskite thin film by introducing lithium halide

Z. Lin, H. Zhu, L. Zhou, J. Du, C. Zhang, Q. Xu, J. Chang, J. Ouyang and Y. Hao, RSC Adv., 2018, 8, 11455 DOI: 10.1039/C8RA01199K

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