Quantifying the Excitonic Static Disorder in Organic Semiconductors

Kay, Austin; Sandberg, Oskar; Zarrabi, Nasim; Li, Wei; Zeiske, Stefan; KAISER, CHRISTINA; Meredith, Paul; Armin, Ardalan

doi:10.1002/adfm.202113181

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Quantifying the Excitonic Static Disorder in Organic Semiconductors

Austin Kay, Oskar Sandberg

, Nasim Zarrabi, Wei Li, Stefan Zeiske, CHRISTINA KAISER, Paul Meredith

, Ardalan Armin

Advanced Functional Materials, Volume: 32, Issue: 32, Start page: 2113181

Swansea University Authors: Austin Kay, Oskar Sandberg , Nasim Zarrabi, Wei Li, Stefan Zeiske, CHRISTINA KAISER, Paul Meredith , Ardalan Armin

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DOI (Published version): 10.1002/adfm.202113181

Abstract

Organic semiconductors are disordered molecular solids, and as a result, their internal charge generation dynamics, charge transport dynamics, and ultimately, the performance of the optoelectronic devices they constitute, are governed by energetic disorder. This is particularly pertinent for emergin...

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Published in:	Advanced Functional Materials
ISSN:	1616-301X 1616-3028
Published:	Wiley 2022
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URI:	https://cronfa.swan.ac.uk/Record/cronfa60155
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spelling	2022-08-31T12:00:49.9482659 v2 60155 2022-06-08 Quantifying the Excitonic Static Disorder in Organic Semiconductors 0d9126cbd038113f697c252762b4f053 Austin Kay Austin Kay true false 9e91512a54d5aee66cd77851a96ba747 0000-0003-3778-8746 Oskar Sandberg Oskar Sandberg true false d20976a5892074dae0368a4bb4433f76 Nasim Zarrabi Nasim Zarrabi true false d6c46502d8e5f62c1af3c7fce334ac90 Wei Li Wei Li true false 0c9c5b89df9ac882c3e09dd1a9f28fc5 Stefan Zeiske Stefan Zeiske true false dd1e83902e695cade3f07fbb6180c7f8 CHRISTINA KAISER CHRISTINA KAISER true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 2022-06-08 SPH Organic semiconductors are disordered molecular solids, and as a result, their internal charge generation dynamics, charge transport dynamics, and ultimately, the performance of the optoelectronic devices they constitute, are governed by energetic disorder. This is particularly pertinent for emerging photovoltaic technology where the extractable power is directly dependent on these dynamics. To ascertain how energetic disorder impacts charge generation, exciton transport, charge transport, and the performance of organic semiconductor devices, an accurate approach is first required to measure this critical parameter. In this work, it is shown that the static disorder of an organic semiconductor can be obtained from its photovoltaic external quantum efficiency spectrum at wavelengths near the absorption onset. A detailed methodology is presented, alongside a computational framework, for quantifying the static energetic disorder associated with singlet excitons. Moreover, the authors show that minimizing the limiting effects of optical interference is crucial for achieving high-accuracy quantifications. Finally, transparent devices are employed to estimate the excitonic static disorder in several technologically relevant organic semiconductor donor–acceptor blends, including the high-efficiency organic photovoltaic system PM6:Y6. Journal Article Advanced Functional Materials 32 32 2113181 Wiley 1616-301X 1616-3028 absorption coefficient, energetic disorder, excitons, external quantum efficiency, organic semiconductors, organic solar cells 8 8 2022 2022-08-08 10.1002/adfm.202113181 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University SU Library paid the OA fee (TA Institutional Deal) This work was funded through the Welsh Government’s Sêr Cymru II Program “Sustainable Advanced Materials” (Welsh European Funding Office − European Regional Development Fund). P.M. is a Sêr Cymru II Research Chair and A.A. is a Rising Star Fellow also funded through the Welsh Government’s Sêr Cymru II “Sustainable Advanced Materials” Program (European Regional Development Fund, Welsh European Funding Office, and Swansea University Strategic Initiative). This work was also funded by UKRI through the EPSRC Program Grant EP/T028511/1 Application Targeted and Integrated Photovoltaics. 2022-08-31T12:00:49.9482659 2022-06-08T12:30:11.4693308 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Austin Kay 1 Oskar Sandberg 0000-0003-3778-8746 2 Nasim Zarrabi 3 Wei Li 4 Stefan Zeiske 5 CHRISTINA KAISER 6 Paul Meredith 0000-0002-9049-7414 7 Ardalan Armin 0000-0002-6129-5354 8 60155__24251__3ee73cac1e784396ad338da8fc2d9939.pdf 60155.pdf 2022-06-08T12:37:19.1151780 Output 1402646 application/pdf Version of Record true © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution License true eng http://creativecommons.org/licenses/by/4.0/
title	Quantifying the Excitonic Static Disorder in Organic Semiconductors
spellingShingle	Quantifying the Excitonic Static Disorder in Organic Semiconductors Austin Kay Oskar Sandberg Nasim Zarrabi Wei Li Stefan Zeiske CHRISTINA KAISER Paul Meredith Ardalan Armin
title_short	Quantifying the Excitonic Static Disorder in Organic Semiconductors
title_full	Quantifying the Excitonic Static Disorder in Organic Semiconductors
title_fullStr	Quantifying the Excitonic Static Disorder in Organic Semiconductors
title_full_unstemmed	Quantifying the Excitonic Static Disorder in Organic Semiconductors
title_sort	Quantifying the Excitonic Static Disorder in Organic Semiconductors
author_id_str_mv	0d9126cbd038113f697c252762b4f053 9e91512a54d5aee66cd77851a96ba747 d20976a5892074dae0368a4bb4433f76 d6c46502d8e5f62c1af3c7fce334ac90 0c9c5b89df9ac882c3e09dd1a9f28fc5 dd1e83902e695cade3f07fbb6180c7f8 31e8fe57fa180d418afd48c3af280c2e 22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv	0d9126cbd038113f697c252762b4f053_*_Austin Kay 9e91512a54d5aee66cd77851a96ba747__Oskar Sandberg d20976a5892074dae0368a4bb4433f76__Nasim Zarrabi d6c46502d8e5f62c1af3c7fce334ac90__Wei Li 0c9c5b89df9ac882c3e09dd1a9f28fc5__Stefan Zeiske dd1e83902e695cade3f07fbb6180c7f8__CHRISTINA KAISER 31e8fe57fa180d418afd48c3af280c2e__Paul Meredith 22b270622d739d81e131bec7a819e2fd_*_Ardalan Armin
author	Austin Kay Oskar Sandberg Nasim Zarrabi Wei Li Stefan Zeiske CHRISTINA KAISER Paul Meredith Ardalan Armin
author2	Austin Kay Oskar Sandberg Nasim Zarrabi Wei Li Stefan Zeiske CHRISTINA KAISER Paul Meredith Ardalan Armin
format	Journal article
container_title	Advanced Functional Materials
container_volume	32
container_issue	32
container_start_page	2113181
publishDate	2022
institution	Swansea University
issn	1616-301X 1616-3028
doi_str_mv	10.1002/adfm.202113181
publisher	Wiley
college_str	Faculty of Science and Engineering
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description	Organic semiconductors are disordered molecular solids, and as a result, their internal charge generation dynamics, charge transport dynamics, and ultimately, the performance of the optoelectronic devices they constitute, are governed by energetic disorder. This is particularly pertinent for emerging photovoltaic technology where the extractable power is directly dependent on these dynamics. To ascertain how energetic disorder impacts charge generation, exciton transport, charge transport, and the performance of organic semiconductor devices, an accurate approach is first required to measure this critical parameter. In this work, it is shown that the static disorder of an organic semiconductor can be obtained from its photovoltaic external quantum efficiency spectrum at wavelengths near the absorption onset. A detailed methodology is presented, alongside a computational framework, for quantifying the static energetic disorder associated with singlet excitons. Moreover, the authors show that minimizing the limiting effects of optical interference is crucial for achieving high-accuracy quantifications. Finally, transparent devices are employed to estimate the excitonic static disorder in several technologically relevant organic semiconductor donor–acceptor blends, including the high-efficiency organic photovoltaic system PM6:Y6.
published_date	2022-08-08T04:18:02Z
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Quantifying the Excitonic Static Disorder in Organic Semiconductors

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