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Title: Imaging Spatial Variations of Optical Bandgaps in Perovskite Solar Cells

Abstract

A fast, nondestructive, camera-based method to capture optical bandgap images of perovskite solar cells (PSCs) with micrometer-scale spatial resolution is developed. This imaging technique utilizes well-defined and relatively symmetrical band-to-band luminescence spectra emitted from perovskite materials, whose spectral peak locations coincide with absorption thresholds and thus represent their optical bandgaps. The technique is employed to capture relative variations in optical bandgaps across various PSCs, and to resolve optical bandgap inhomogeneity within the same device due to material degradation and impurities. Degradation and impurities are found to both cause optical bandgap shifts inside the materials. The results are confirmed with micro-photoluminescence spectroscopy scans. The excellent agreement between the two techniques opens opportunities for this imaging concept to become a quantified, high spatial resolution, large-area characterization tool of PSCs. This development continues to strengthen the high value of luminescence imaging for the research and development of this photovoltaic technology.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1];  [1];  [1];  [1];  [1]
  1. Australian National Univ., Canberra, ACT (Australia)
  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)
OSTI Identifier:
1491142
Alternate Identifier(s):
OSTI ID: 1486892
Report Number(s):
NREL/JA-5K00-73074
Journal ID: ISSN 1614-6832
Grant/Contract Number:  
AC36-08GO28308; AC36‐08GO28308
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Advanced Energy Materials
Additional Journal Information:
Journal Volume: in press; Journal Issue: 4; Journal ID: ISSN 1614-6832
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; bandgap; imaging; luminescence; perovskite; photovoltaic

Citation Formats

Chen, Boyi, Peng, Jun, Shen, Heping, Duong, The, Walter, Daniel, Johnston, Steve, Al‐Jassim, Mowafak M., Weber, Klaus J., White, Thomas P., Catchpole, Kylie R., Macdonald, Daniel, and Nguyen, Hieu T.. Imaging Spatial Variations of Optical Bandgaps in Perovskite Solar Cells. United States: N. p., 2018. Web. doi:10.1002/aenm.201802790.
Chen, Boyi, Peng, Jun, Shen, Heping, Duong, The, Walter, Daniel, Johnston, Steve, Al‐Jassim, Mowafak M., Weber, Klaus J., White, Thomas P., Catchpole, Kylie R., Macdonald, Daniel, & Nguyen, Hieu T.. Imaging Spatial Variations of Optical Bandgaps in Perovskite Solar Cells. United States. doi:10.1002/aenm.201802790.
Chen, Boyi, Peng, Jun, Shen, Heping, Duong, The, Walter, Daniel, Johnston, Steve, Al‐Jassim, Mowafak M., Weber, Klaus J., White, Thomas P., Catchpole, Kylie R., Macdonald, Daniel, and Nguyen, Hieu T.. Fri . "Imaging Spatial Variations of Optical Bandgaps in Perovskite Solar Cells". United States. doi:10.1002/aenm.201802790.
@article{osti_1491142,
title = {Imaging Spatial Variations of Optical Bandgaps in Perovskite Solar Cells},
author = {Chen, Boyi and Peng, Jun and Shen, Heping and Duong, The and Walter, Daniel and Johnston, Steve and Al‐Jassim, Mowafak M. and Weber, Klaus J. and White, Thomas P. and Catchpole, Kylie R. and Macdonald, Daniel and Nguyen, Hieu T.},
abstractNote = {A fast, nondestructive, camera-based method to capture optical bandgap images of perovskite solar cells (PSCs) with micrometer-scale spatial resolution is developed. This imaging technique utilizes well-defined and relatively symmetrical band-to-band luminescence spectra emitted from perovskite materials, whose spectral peak locations coincide with absorption thresholds and thus represent their optical bandgaps. The technique is employed to capture relative variations in optical bandgaps across various PSCs, and to resolve optical bandgap inhomogeneity within the same device due to material degradation and impurities. Degradation and impurities are found to both cause optical bandgap shifts inside the materials. The results are confirmed with micro-photoluminescence spectroscopy scans. The excellent agreement between the two techniques opens opportunities for this imaging concept to become a quantified, high spatial resolution, large-area characterization tool of PSCs. This development continues to strengthen the high value of luminescence imaging for the research and development of this photovoltaic technology.},
doi = {10.1002/aenm.201802790},
journal = {Advanced Energy Materials},
issn = {1614-6832},
number = 4,
volume = in press,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
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Works referenced in this record:

Organometal Halide Perovskites as Visible-Light Sensitizers for Photovoltaic Cells
journal, May 2009

  • Kojima, Akihiro; Teshima, Kenjiro; Shirai, Yasuo
  • Journal of the American Chemical Society, Vol. 131, Issue 17, p. 6050-6051
  • DOI: 10.1021/ja809598r