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:
-
- Australian National Univ., Canberra, ACT (Australia)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (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:
- 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. https://doi.org/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. https://doi.org/10.1002/aenm.201802790. https://www.osti.gov/servlets/purl/1491142.
@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},
number = 4,
volume = in press,
place = {United States},
year = {Fri Dec 14 00:00:00 EST 2018},
month = {Fri Dec 14 00:00:00 EST 2018}
}
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