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Organic solar cells with near-unity charge generation yield

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

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

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

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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
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URI: https://cronfa.swan.ac.uk/Record/cronfa58680
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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 &#x2013; 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 &#x2013; 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 &amp; 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">College of Science</level><level id="2">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 College of Science 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
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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 College of Science
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hierarchy_top_id collegeofscience
hierarchy_top_title College of Science
hierarchy_parent_id collegeofscience
hierarchy_parent_title College of Science
department_str Physics{{{_:::_}}}College of Science{{{_:::_}}}Physics
document_store_str 1
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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 2021-11-04T04:32:59Z
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