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Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells

Scot Wheeler, Daniel Bryant, Joel Troughton, Thomas Kirchartz, Trystan Watson Orcid Logo, Jenny Nelson, James Durrant Orcid Logo

The Journal of Physical Chemistry C, Volume: 121, Issue: 25, Pages: 13496 - 13506

Swansea University Authors: Trystan Watson Orcid Logo, James Durrant Orcid Logo

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DOI (Published version): 10.1021/acs.jpcc.7b02411

Abstract

Transient optoelectronic measurements are used to evaluate the factors determining the open-circuit voltage of a series of planar photovoltaic devices based on hybrid perovskite layers of varying iodine:bromine ratio. Employing differential charging and transient photovoltage measurements, we use a...

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Published in: The Journal of Physical Chemistry C
ISSN: 1932-7447 1932-7455
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa34264
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spelling 2017-08-14T11:01:47.8526633 v2 34264 2017-06-13 Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells a210327b52472cfe8df9b8108d661457 0000-0002-8015-1436 Trystan Watson Trystan Watson true false f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2017-06-13 MTLS Transient optoelectronic measurements are used to evaluate the factors determining the open-circuit voltage of a series of planar photovoltaic devices based on hybrid perovskite layers of varying iodine:bromine ratio. Employing differential charging and transient photovoltage measurements, we use a simple device model based on the charge carrier density dependence of non-geminate recombination to recreate correctly not only the measured device open-circuit voltage (VOC) as a function of light intensity, but also its dependence with bromine substitution. The 173 (±7) mV increase in device voltage observed with 20 % bromine substitution is shown to result from a 227 (±8) mV increase in effective electronic bandgap, which is offset in part by a 56 (±5) mV voltage loss due to faster carrier recombination. The faster recombination following 20% bromine substitution is avoided by ICBA (indene-C60-bisadduct) substitution into the PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) electron collection layer, resulting in a further 73 (±7) mV increase in device VOC. This is consistent with surface recombination losses at the perovskite / fullerene interface being the primary limitation on the VOC output of bromine substituted devices. This study thus presents, and experimentally validates, a simple model for the device physics underlying voltage generation in such perovskite based solar cells, and demonstrates that this approach can provide key insights into factors limiting this voltage output as function of material energetics. Journal Article The Journal of Physical Chemistry C 121 25 13496 13506 1932-7447 1932-7455 31 12 2017 2017-12-31 10.1021/acs.jpcc.7b02411 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2017-08-14T11:01:47.8526633 2017-06-13T11:17:28.7525466 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Scot Wheeler 1 Daniel Bryant 2 Joel Troughton 3 Thomas Kirchartz 4 Trystan Watson 0000-0002-8015-1436 5 Jenny Nelson 6 James Durrant 0000-0001-8353-7345 7 0034264-13062017111915.pdf wheeler2017.pdf 2017-06-13T11:19:15.3470000 Output 1568855 application/pdf Accepted Manuscript true 2018-06-06T00:00:00.0000000 true eng
title Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells
spellingShingle Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells
Trystan Watson
James Durrant
title_short Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells
title_full Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells
title_fullStr Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells
title_full_unstemmed Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells
title_sort Transient Optoelectronic Analysis of the Impact of Material Energetics and Recombination Kinetics on the Open-Circuit Voltage of Hybrid Perovskite Solar Cells
author_id_str_mv a210327b52472cfe8df9b8108d661457
f3dd64bc260e5c07adfa916c27dbd58a
author_id_fullname_str_mv a210327b52472cfe8df9b8108d661457_***_Trystan Watson
f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant
author Trystan Watson
James Durrant
author2 Scot Wheeler
Daniel Bryant
Joel Troughton
Thomas Kirchartz
Trystan Watson
Jenny Nelson
James Durrant
format Journal article
container_title The Journal of Physical Chemistry C
container_volume 121
container_issue 25
container_start_page 13496
publishDate 2017
institution Swansea University
issn 1932-7447
1932-7455
doi_str_mv 10.1021/acs.jpcc.7b02411
college_str Faculty of Science and Engineering
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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 Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description Transient optoelectronic measurements are used to evaluate the factors determining the open-circuit voltage of a series of planar photovoltaic devices based on hybrid perovskite layers of varying iodine:bromine ratio. Employing differential charging and transient photovoltage measurements, we use a simple device model based on the charge carrier density dependence of non-geminate recombination to recreate correctly not only the measured device open-circuit voltage (VOC) as a function of light intensity, but also its dependence with bromine substitution. The 173 (±7) mV increase in device voltage observed with 20 % bromine substitution is shown to result from a 227 (±8) mV increase in effective electronic bandgap, which is offset in part by a 56 (±5) mV voltage loss due to faster carrier recombination. The faster recombination following 20% bromine substitution is avoided by ICBA (indene-C60-bisadduct) substitution into the PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) electron collection layer, resulting in a further 73 (±7) mV increase in device VOC. This is consistent with surface recombination losses at the perovskite / fullerene interface being the primary limitation on the VOC output of bromine substituted devices. This study thus presents, and experimentally validates, a simple model for the device physics underlying voltage generation in such perovskite based solar cells, and demonstrates that this approach can provide key insights into factors limiting this voltage output as function of material energetics.
published_date 2017-12-31T03:42:29Z
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score 11.016235

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