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Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements

World-wide studies on multi-junction (tandem) solar cells have led to record-breaking improvements in conversion efficiencies year after year. To obtain detailed and proper feedback for solar-cell design and fabrication, it is necessary to establish standard methods for diagnosing subcells in fabric...

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Autores principales: Chen, Shaoqiang, Zhu, Lin, Yoshita, Masahiro, Mochizuki, Toshimitsu, Kim, Changsu, Akiyama, Hidefumi, Imaizumi, Mitsuru, Kanemitsu, Yoshihiko
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4296303/
https://www.ncbi.nlm.nih.gov/pubmed/25592484
http://dx.doi.org/10.1038/srep07836
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author Chen, Shaoqiang
Zhu, Lin
Yoshita, Masahiro
Mochizuki, Toshimitsu
Kim, Changsu
Akiyama, Hidefumi
Imaizumi, Mitsuru
Kanemitsu, Yoshihiko
author_facet Chen, Shaoqiang
Zhu, Lin
Yoshita, Masahiro
Mochizuki, Toshimitsu
Kim, Changsu
Akiyama, Hidefumi
Imaizumi, Mitsuru
Kanemitsu, Yoshihiko
author_sort Chen, Shaoqiang
collection PubMed
description World-wide studies on multi-junction (tandem) solar cells have led to record-breaking improvements in conversion efficiencies year after year. To obtain detailed and proper feedback for solar-cell design and fabrication, it is necessary to establish standard methods for diagnosing subcells in fabricated tandem devices. Here, we propose a potential standard method to quantify the detailed subcell properties of multi-junction solar cells based on absolute measurements of electroluminescence (EL) external quantum efficiency in addition to the conventional solar-cell external-quantum-efficiency measurements. We demonstrate that the absolute-EL-quantum-efficiency measurements provide I–V relations of individual subcells without the need for referencing measured I–V data, which is in stark contrast to previous works. Moreover, our measurements quantify the absolute rates of junction loss, non-radiative loss, radiative loss, and luminescence coupling in the subcells, which constitute the “balance sheets” of tandem solar cells.
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spelling pubmed-42963032015-01-26 Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements Chen, Shaoqiang Zhu, Lin Yoshita, Masahiro Mochizuki, Toshimitsu Kim, Changsu Akiyama, Hidefumi Imaizumi, Mitsuru Kanemitsu, Yoshihiko Sci Rep Article World-wide studies on multi-junction (tandem) solar cells have led to record-breaking improvements in conversion efficiencies year after year. To obtain detailed and proper feedback for solar-cell design and fabrication, it is necessary to establish standard methods for diagnosing subcells in fabricated tandem devices. Here, we propose a potential standard method to quantify the detailed subcell properties of multi-junction solar cells based on absolute measurements of electroluminescence (EL) external quantum efficiency in addition to the conventional solar-cell external-quantum-efficiency measurements. We demonstrate that the absolute-EL-quantum-efficiency measurements provide I–V relations of individual subcells without the need for referencing measured I–V data, which is in stark contrast to previous works. Moreover, our measurements quantify the absolute rates of junction loss, non-radiative loss, radiative loss, and luminescence coupling in the subcells, which constitute the “balance sheets” of tandem solar cells. Nature Publishing Group 2015-01-16 /pmc/articles/PMC4296303/ /pubmed/25592484 http://dx.doi.org/10.1038/srep07836 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-sa/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/
spellingShingle Article
Chen, Shaoqiang
Zhu, Lin
Yoshita, Masahiro
Mochizuki, Toshimitsu
Kim, Changsu
Akiyama, Hidefumi
Imaizumi, Mitsuru
Kanemitsu, Yoshihiko
Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements
title Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements
title_full Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements
title_fullStr Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements
title_full_unstemmed Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements
title_short Thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements
title_sort thorough subcells diagnosis in a multi-junction solar cell via absolute electroluminescence-efficiency measurements
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4296303/
https://www.ncbi.nlm.nih.gov/pubmed/25592484
http://dx.doi.org/10.1038/srep07836
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