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Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias

Stefan Zeiske, Christina Kaiser, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo

ACS Photonics, Volume: 7, Issue: 1, Pages: 256 - 264

Swansea University Authors: Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo

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DOI (Published version): 10.1021/acsphotonics.9b01531

Abstract

The measurement of the external quantum efficiency (EQE) for photocurrent generation at photon energies below the bandgap of semiconductors has always been an important tool for understanding phenomena such as charge photogeneration via tail and trap states. The shape of the subgap EQE can also reve...

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Published in: ACS Photonics
ISSN: 2330-4022 2330-4022
Published: American Chemical Society (ACS) 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53276
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spelling 2022-12-05T11:53:03.6463382 v2 53276 2020-01-15 Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 2020-01-15 SPH The measurement of the external quantum efficiency (EQE) for photocurrent generation at photon energies below the bandgap of semiconductors has always been an important tool for understanding phenomena such as charge photogeneration via tail and trap states. The shape of the subgap EQE can also reveal the subtle but important physics of inter- and intramolecular states that lay at the heart of charge photogeneration in molecular systems such as organic semiconductors. In this work, we examine the influence of optical and electrical noise on the sensitivity of EQE measurements under different electrical and optical bias conditions and demonstrate how to enhance the dynamic range to an unprecedented >100 dB. We identify and study several apparatus-and-device-related factors limiting the sensitivity including: the electrical noise floor of the measurement system; flicker and pick-up noise; probe light source stray light; the photon noise of the light bias source; the electrical noise of the voltage bias source; and the shunt-resistance-limited thermal and electrical shot noise of the device. By understanding and minimizing the influence of these factors we are able to detect EQE signals derived from weak subgap absorption features in both organic and inorganic solar cell systems at photon energies well below their bandgaps. Journal Article ACS Photonics 7 1 256 264 American Chemical Society (ACS) 2330-4022 2330-4022 solar cells, sensetive external quantum efficiency, trap states, charge transfer states, sub-bandgap absorption, photocurrent spectroscopy 15 1 2020 2020-01-15 10.1021/acsphotonics.9b01531 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2022-12-05T11:53:03.6463382 2020-01-15T16:59:23.7282826 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Stefan Zeiske 1 Christina Kaiser 2 Paul Meredith 0000-0002-9049-7414 3 Ardalan Armin 0000-0002-6129-5354 4 53276__16404__8f457420d570409cae449fc9ab612c6a.pdf 53276.pdf 2020-01-23T14:46:34.4744620 Output 1764450 application/pdf Version of Record true This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. true eng https://pubs.acs.org/page/policy/authorchoice_termsofuse.html
title Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias
spellingShingle Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias
Paul Meredith
Ardalan Armin
title_short Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias
title_full Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias
title_fullStr Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias
title_full_unstemmed Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias
title_sort Sensitivity of Sub-Bandgap External Quantum Efficiency Measurements of Solar Cells under Electrical and Light Bias
author_id_str_mv 31e8fe57fa180d418afd48c3af280c2e
22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv 31e8fe57fa180d418afd48c3af280c2e_***_Paul Meredith
22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
author Paul Meredith
Ardalan Armin
author2 Stefan Zeiske
Christina Kaiser
Paul Meredith
Ardalan Armin
format Journal article
container_title ACS Photonics
container_volume 7
container_issue 1
container_start_page 256
publishDate 2020
institution Swansea University
issn 2330-4022
2330-4022
doi_str_mv 10.1021/acsphotonics.9b01531
publisher American Chemical Society (ACS)
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
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description The measurement of the external quantum efficiency (EQE) for photocurrent generation at photon energies below the bandgap of semiconductors has always been an important tool for understanding phenomena such as charge photogeneration via tail and trap states. The shape of the subgap EQE can also reveal the subtle but important physics of inter- and intramolecular states that lay at the heart of charge photogeneration in molecular systems such as organic semiconductors. In this work, we examine the influence of optical and electrical noise on the sensitivity of EQE measurements under different electrical and optical bias conditions and demonstrate how to enhance the dynamic range to an unprecedented >100 dB. We identify and study several apparatus-and-device-related factors limiting the sensitivity including: the electrical noise floor of the measurement system; flicker and pick-up noise; probe light source stray light; the photon noise of the light bias source; the electrical noise of the voltage bias source; and the shunt-resistance-limited thermal and electrical shot noise of the device. By understanding and minimizing the influence of these factors we are able to detect EQE signals derived from weak subgap absorption features in both organic and inorganic solar cell systems at photon energies well below their bandgaps.
published_date 2020-01-15T04:06:09Z
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score 11.013148

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