Organic solar cells with near-unity charge generation yield

Li, Wei; Zeiske, Stefan; Sandberg, Oskar; Riley, Drew; Meredith, Paul; Armin, Ardalan

doi:10.1039/d1ee01367j

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Organic solar cells with near-unity charge generation yield

Wei Li, Stefan Zeiske, Oskar Sandberg

, Drew Riley, Paul Meredith

, Ardalan Armin

Energy & Environmental Science, Volume: 14, Issue: 12, Pages: 6484 - 6493

Swansea University Authors: Wei Li, Stefan Zeiske, Oskar Sandberg , Drew Riley, Paul Meredith , Ardalan Armin

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DOI (Published version): 10.1039/d1ee01367j

Abstract

The subtle link between photogenerated charge generation yield (CGY) and bimolecular recombination in organic semiconductor-based photovoltaics is relatively well established as a concept but has proven extremely challenging to demonstrate and probe especially under operational conditions. Received...

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Published in:	Energy & Environmental Science
ISSN:	1754-5692 1754-5706
Published:	Royal Society of Chemistry (RSC) 2021
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa58680
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first_indexed	2021-11-15T15:37:29Z
last_indexed	2022-01-07T04:26:08Z
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Received wisdom also teaches that charge generation in excitonic systems will always be lower than non-excitonic semiconductors such as GaAs – but this view is being challenged with the advent of organic semiconductor blends based upon non-fullerene acceptors (NFAs) with power conversion efficiencies exceeding 18%. Using a newly developed approach based upon temperature dependent ultra-sensitive external quantum efficiency measurements, we observe near unity CGY in several model NFA-based systems measured with unprecedented accuracy. We find that a relatively small increase in yield from 0.984 to 0.993 leads to a reduction in bimolecular recombination from 400 times to 1000 times relative to the Langevin limit. In turn, this dramatic reduction delivers the best thick junction performance to date in any binary organic solar cell – notably 16.2% at 300 nm. The combination of high efficiency and thick junction is the key for industrial fabrication of these devices via high-throughput deposition processing such as roll-to-roll, and thus central to a viable solar cell technology. These results also clearly reveal and elucidate the relationship between photo-generation and recombination in excitonic semiconductor photovoltaics thus providing an important bridge between basic device physics and practical cell engineering.</abstract><type>Journal Article</type><journal>Energy & Environmental Science</journal><volume>14</volume><journalNumber>12</journalNumber><paginationStart>6484</paginationStart><paginationEnd>6493</paginationEnd><publisher>Royal Society of Chemistry (RSC)</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>1754-5692</issnPrint><issnElectronic>1754-5706</issnElectronic><keywords>Pollution, Nuclear Energy and Engineering, Renewable Energy, Sustainability and the Environment, Environmental Chemistry</keywords><publishedDay>4</publishedDay><publishedMonth>11</publishedMonth><publishedYear>2021</publishedYear><publishedDate>2021-11-04</publishedDate><doi>10.1039/d1ee01367j</doi><url/><notes/><college>COLLEGE NANME</college><department>Physics</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>SPH</DepartmentCode><institution>Swansea University</institution><apcterm/><funders>Engineering and Physical Sciences Research Council Grant: EP/T028511/1 Identifier: FundRef 10.13039/501100000266 Natural Sciences and Engineering Research Council of Canada Grant: PGSD3-545694-2020 Identifier: FundRef 10.13039/501100000038</funders><lastEdited>2022-01-06T16:39:45.4443087</lastEdited><Created>2021-11-15T15:32:35.3180478</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Biosciences, Geography and Physics - Physics</level></path><authors><author><firstname>Wei</firstname><surname>Li</surname><order>1</order></author><author><firstname>Stefan</firstname><surname>Zeiske</surname><order>2</order></author><author><firstname>Oskar</firstname><surname>Sandberg</surname><orcid>0000-0003-3778-8746</orcid><order>3</order></author><author><firstname>Drew</firstname><surname>Riley</surname><order>4</order></author><author><firstname>Paul</firstname><surname>Meredith</surname><orcid>0000-0002-9049-7414</orcid><order>5</order></author><author><firstname>Ardalan</firstname><surname>Armin</surname><orcid>0000-0002-6129-5354</orcid><order>6</order></author></authors><documents><document><filename>58680__21545__372877a3cbcf4f40864f95f6ef0d2215.pdf</filename><originalFilename>58680.pdf</originalFilename><uploaded>2021-11-15T15:36:07.5656507</uploaded><type>Output</type><contentLength>3506965</contentLength><contentType>application/pdf</contentType><version>Version of Record</version><cronfaStatus>true</cronfaStatus><documentNotes>Open Access Article. 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spelling	2022-01-06T16:39:45.4443087 v2 58680 2021-11-15 Organic solar cells with near-unity charge generation yield d6c46502d8e5f62c1af3c7fce334ac90 Wei Li Wei Li true false 0c9c5b89df9ac882c3e09dd1a9f28fc5 Stefan Zeiske Stefan Zeiske true false 9e91512a54d5aee66cd77851a96ba747 0000-0003-3778-8746 Oskar Sandberg Oskar Sandberg true false edca1c48f922393fa2b3cb84d8dc0e4a Drew Riley Drew Riley true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 2021-11-15 SPH The subtle link between photogenerated charge generation yield (CGY) and bimolecular recombination in organic semiconductor-based photovoltaics is relatively well established as a concept but has proven extremely challenging to demonstrate and probe especially under operational conditions. Received wisdom also teaches that charge generation in excitonic systems will always be lower than non-excitonic semiconductors such as GaAs – but this view is being challenged with the advent of organic semiconductor blends based upon non-fullerene acceptors (NFAs) with power conversion efficiencies exceeding 18%. Using a newly developed approach based upon temperature dependent ultra-sensitive external quantum efficiency measurements, we observe near unity CGY in several model NFA-based systems measured with unprecedented accuracy. We find that a relatively small increase in yield from 0.984 to 0.993 leads to a reduction in bimolecular recombination from 400 times to 1000 times relative to the Langevin limit. In turn, this dramatic reduction delivers the best thick junction performance to date in any binary organic solar cell – notably 16.2% at 300 nm. The combination of high efficiency and thick junction is the key for industrial fabrication of these devices via high-throughput deposition processing such as roll-to-roll, and thus central to a viable solar cell technology. These results also clearly reveal and elucidate the relationship between photo-generation and recombination in excitonic semiconductor photovoltaics thus providing an important bridge between basic device physics and practical cell engineering. Journal Article Energy & Environmental Science 14 12 6484 6493 Royal Society of Chemistry (RSC) 1754-5692 1754-5706 Pollution, Nuclear Energy and Engineering, Renewable Energy, Sustainability and the Environment, Environmental Chemistry 4 11 2021 2021-11-04 10.1039/d1ee01367j COLLEGE NANME Physics COLLEGE CODE SPH Swansea University Engineering and Physical Sciences Research Council Grant: EP/T028511/1 Identifier: FundRef 10.13039/501100000266 Natural Sciences and Engineering Research Council of Canada Grant: PGSD3-545694-2020 Identifier: FundRef 10.13039/501100000038 2022-01-06T16:39:45.4443087 2021-11-15T15:32:35.3180478 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Wei Li 1 Stefan Zeiske 2 Oskar Sandberg 0000-0003-3778-8746 3 Drew Riley 4 Paul Meredith 0000-0002-9049-7414 5 Ardalan Armin 0000-0002-6129-5354 6 58680__21545__372877a3cbcf4f40864f95f6ef0d2215.pdf 58680.pdf 2021-11-15T15:36:07.5656507 Output 3506965 application/pdf Version of Record true Open Access Article. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. true eng https://creativecommons.org/licenses/by/3.0/
title	Organic solar cells with near-unity charge generation yield
spellingShingle	Organic solar cells with near-unity charge generation yield Wei Li Stefan Zeiske Oskar Sandberg Drew Riley Paul Meredith Ardalan Armin
title_short	Organic solar cells with near-unity charge generation yield
title_full	Organic solar cells with near-unity charge generation yield
title_fullStr	Organic solar cells with near-unity charge generation yield
title_full_unstemmed	Organic solar cells with near-unity charge generation yield
title_sort	Organic solar cells with near-unity charge generation yield
author_id_str_mv	d6c46502d8e5f62c1af3c7fce334ac90 0c9c5b89df9ac882c3e09dd1a9f28fc5 9e91512a54d5aee66cd77851a96ba747 edca1c48f922393fa2b3cb84d8dc0e4a 31e8fe57fa180d418afd48c3af280c2e 22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv	d6c46502d8e5f62c1af3c7fce334ac90_*_Wei Li 0c9c5b89df9ac882c3e09dd1a9f28fc5__Stefan Zeiske 9e91512a54d5aee66cd77851a96ba747__Oskar Sandberg edca1c48f922393fa2b3cb84d8dc0e4a__Drew Riley 31e8fe57fa180d418afd48c3af280c2e__Paul Meredith 22b270622d739d81e131bec7a819e2fd_*_Ardalan Armin
author	Wei Li Stefan Zeiske Oskar Sandberg Drew Riley Paul Meredith Ardalan Armin
author2	Wei Li Stefan Zeiske Oskar Sandberg Drew Riley Paul Meredith Ardalan Armin
format	Journal article
container_title	Energy & Environmental Science
container_volume	14
container_issue	12
container_start_page	6484
publishDate	2021
institution	Swansea University
issn	1754-5692 1754-5706
doi_str_mv	10.1039/d1ee01367j
publisher	Royal Society of Chemistry (RSC)
college_str	Faculty of Science and Engineering
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department_str	School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
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description	The subtle link between photogenerated charge generation yield (CGY) and bimolecular recombination in organic semiconductor-based photovoltaics is relatively well established as a concept but has proven extremely challenging to demonstrate and probe especially under operational conditions. Received wisdom also teaches that charge generation in excitonic systems will always be lower than non-excitonic semiconductors such as GaAs – but this view is being challenged with the advent of organic semiconductor blends based upon non-fullerene acceptors (NFAs) with power conversion efficiencies exceeding 18%. Using a newly developed approach based upon temperature dependent ultra-sensitive external quantum efficiency measurements, we observe near unity CGY in several model NFA-based systems measured with unprecedented accuracy. We find that a relatively small increase in yield from 0.984 to 0.993 leads to a reduction in bimolecular recombination from 400 times to 1000 times relative to the Langevin limit. In turn, this dramatic reduction delivers the best thick junction performance to date in any binary organic solar cell – notably 16.2% at 300 nm. The combination of high efficiency and thick junction is the key for industrial fabrication of these devices via high-throughput deposition processing such as roll-to-roll, and thus central to a viable solar cell technology. These results also clearly reveal and elucidate the relationship between photo-generation and recombination in excitonic semiconductor photovoltaics thus providing an important bridge between basic device physics and practical cell engineering.
published_date	2021-11-04T04:15:23Z
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Organic solar cells with near-unity charge generation yield

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