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Title: Impact of grain boundaries on efficiency and stability of organic-inorganic trihalide perovskites

Abstract

Organic-inorganic perovskite solar cells have attracted tremendous attention because of their remarkably high power conversion efficiencies. To further improve device performance, it is imperative to obtain fundamental understandings on the photo-response and long-term stability down to the microscopic level. Here, we report the quantitative nanoscale photoconductivity imaging on two methylammonium lead triiodide thin films with different efficiencies by light-stimulated microwave impedance microscopy. The microwave signals are largely uniform across grains and grain boundaries, suggesting that microstructures do not lead to strong spatial variations of the intrinsic photo-response. In contrast, the measured photoconductivity and lifetime are strongly affected by bulk properties such as the sample crystallinity. As visualized by the spatial evolution of local photoconductivity, the degradation process begins with the disintegration of grains rather than nucleation and propagation from visible boundaries between grains. In conclusion, our findings provide insights to improve the electro-optical properties of perovskite thin films towards large-scale commercialization.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [2];  [1]
  1. Univ. of Texas at Austin, Austin, TX (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
OSTI Identifier:
1416518
Report Number(s):
NREL/JA-5900-68285
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 42 ENGINEERING; electronic properties; electronic materials; organic-inorganic nanostructures; solar cells

Citation Formats

Chu, Zhaodong, Yang, Mengjin, Schulz, Philip, Wu, Di, Ma, Xin, Seifert, Edward, Sun, Liuyang, Li, Xiaoqin, Zhu, Kai, and Lai, Keji. Impact of grain boundaries on efficiency and stability of organic-inorganic trihalide perovskites. United States: N. p., 2017. Web. doi:10.1038/s41467-017-02331-4.
Chu, Zhaodong, Yang, Mengjin, Schulz, Philip, Wu, Di, Ma, Xin, Seifert, Edward, Sun, Liuyang, Li, Xiaoqin, Zhu, Kai, & Lai, Keji. Impact of grain boundaries on efficiency and stability of organic-inorganic trihalide perovskites. United States. doi:10.1038/s41467-017-02331-4.
Chu, Zhaodong, Yang, Mengjin, Schulz, Philip, Wu, Di, Ma, Xin, Seifert, Edward, Sun, Liuyang, Li, Xiaoqin, Zhu, Kai, and Lai, Keji. Wed . "Impact of grain boundaries on efficiency and stability of organic-inorganic trihalide perovskites". United States. doi:10.1038/s41467-017-02331-4. https://www.osti.gov/servlets/purl/1416518.
@article{osti_1416518,
title = {Impact of grain boundaries on efficiency and stability of organic-inorganic trihalide perovskites},
author = {Chu, Zhaodong and Yang, Mengjin and Schulz, Philip and Wu, Di and Ma, Xin and Seifert, Edward and Sun, Liuyang and Li, Xiaoqin and Zhu, Kai and Lai, Keji},
abstractNote = {Organic-inorganic perovskite solar cells have attracted tremendous attention because of their remarkably high power conversion efficiencies. To further improve device performance, it is imperative to obtain fundamental understandings on the photo-response and long-term stability down to the microscopic level. Here, we report the quantitative nanoscale photoconductivity imaging on two methylammonium lead triiodide thin films with different efficiencies by light-stimulated microwave impedance microscopy. The microwave signals are largely uniform across grains and grain boundaries, suggesting that microstructures do not lead to strong spatial variations of the intrinsic photo-response. In contrast, the measured photoconductivity and lifetime are strongly affected by bulk properties such as the sample crystallinity. As visualized by the spatial evolution of local photoconductivity, the degradation process begins with the disintegration of grains rather than nucleation and propagation from visible boundaries between grains. In conclusion, our findings provide insights to improve the electro-optical properties of perovskite thin films towards large-scale commercialization.},
doi = {10.1038/s41467-017-02331-4},
journal = {Nature Communications},
number = 1,
volume = 8,
place = {United States},
year = {2017},
month = {12}
}

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