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Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells
Advanced Energy Materials, Volume: 10, Issue: 47, Start page: 2002124
Swansea University Author:
James Durrant
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DOI (Published version): 10.1002/aenm.202002124
Abstract
Efficient charge generation in organic semiconductors usually requires an interface with an energetic gradient between an electron donor and an electron acceptor in order to dissociate the photogenerated excitons. However, single-component organic solar cells based on chloroboron subnaphthalocyanine...
Published in: | Advanced Energy Materials |
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ISSN: | 1614-6832 1614-6840 |
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Wiley
2020
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URI: | https://cronfa.swan.ac.uk/Record/cronfa55819 |
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<?xml version="1.0"?><rfc1807><datestamp>2021-01-26T16:01:06.6909759</datestamp><bib-version>v2</bib-version><id>55819</id><entry>2020-12-03</entry><title>Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells</title><swanseaauthors><author><sid>f3dd64bc260e5c07adfa916c27dbd58a</sid><ORCID>0000-0001-8353-7345</ORCID><firstname>James</firstname><surname>Durrant</surname><name>James Durrant</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2020-12-03</date><deptcode>MTLS</deptcode><abstract>Efficient charge generation in organic semiconductors usually requires an interface with an energetic gradient between an electron donor and an electron acceptor in order to dissociate the photogenerated excitons. However, single-component organic solar cells based on chloroboron subnaphthalocyanine (SubNc) have been reported to provide considerable photocurrents despite the absence of an energy gradient at the interface with an acceptor. In this work, it is shown that this is not due to direct free carrier generation upon illumination of SubNc, but due to a field-assisted exciton dissociation mechanism specific to the device configuration. Subsequently, the implications of this effect in bilayer organic solar cells with SubNc as the donor are demonstrated, showing that the external and internal quantum efficiencies in such cells are independent of the donor-acceptor interface energetics. This previously unexplored mechanism results in efficient photocurrent generation even though the driving force is minimized and the open-circuit voltage is maximized.</abstract><type>Journal Article</type><journal>Advanced Energy Materials</journal><volume>10</volume><journalNumber>47</journalNumber><paginationStart>2002124</paginationStart><paginationEnd/><publisher>Wiley</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>1614-6832</issnPrint><issnElectronic>1614-6840</issnElectronic><keywords>charge generation; driving force; field‐dependent; organic solar cells; ultrafast spectroscopy</keywords><publishedDay>15</publishedDay><publishedMonth>12</publishedMonth><publishedYear>2020</publishedYear><publishedDate>2020-12-15</publishedDate><doi>10.1002/aenm.202002124</doi><url/><notes/><college>COLLEGE NANME</college><department>Materials Science and Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>MTLS</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2021-01-26T16:01:06.6909759</lastEdited><Created>2020-12-03T10:28:08.2051819</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Materials Science and Engineering</level></path><authors><author><firstname>Vasileios C.</firstname><surname>Nikolis</surname><order>1</order></author><author><firstname>Yifan</firstname><surname>Dong</surname><order>2</order></author><author><firstname>Jonas</firstname><surname>Kublitski</surname><order>3</order></author><author><firstname>Johannes</firstname><surname>Benduhn</surname><order>4</order></author><author><firstname>Xijia</firstname><surname>Zheng</surname><order>5</order></author><author><firstname>Chengye</firstname><surname>Huang</surname><order>6</order></author><author><firstname>A. Celil</firstname><surname>Yüzer</surname><order>7</order></author><author><firstname>Mine</firstname><surname>Ince</surname><order>8</order></author><author><firstname>Donato</firstname><surname>Spoltore</surname><order>9</order></author><author><firstname>James</firstname><surname>Durrant</surname><orcid>0000-0001-8353-7345</orcid><order>10</order></author><author><firstname>Artem A.</firstname><surname>Bakulin</surname><order>11</order></author><author><firstname>Koen</firstname><surname>Vandewal</surname><order>12</order></author></authors><documents><document><filename>55819__19185__9afc43a0e1984d29a30a3fc6854eb09a.pdf</filename><originalFilename>55819.pdf</originalFilename><uploaded>2021-01-26T15:58:57.7859756</uploaded><type>Output</type><contentLength>1025938</contentLength><contentType>application/pdf</contentType><version>Version of Record</version><cronfaStatus>true</cronfaStatus><documentNotes>© 2020 The Authors. This is an open access article under the terms of the Creative Commons Attribution License</documentNotes><copyrightCorrect>true</copyrightCorrect><language>eng</language><licence>http://creativecommons.org/licenses/by/4.0/</licence></document></documents><OutputDurs/></rfc1807> |
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2021-01-26T16:01:06.6909759 v2 55819 2020-12-03 Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells f3dd64bc260e5c07adfa916c27dbd58a 0000-0001-8353-7345 James Durrant James Durrant true false 2020-12-03 MTLS Efficient charge generation in organic semiconductors usually requires an interface with an energetic gradient between an electron donor and an electron acceptor in order to dissociate the photogenerated excitons. However, single-component organic solar cells based on chloroboron subnaphthalocyanine (SubNc) have been reported to provide considerable photocurrents despite the absence of an energy gradient at the interface with an acceptor. In this work, it is shown that this is not due to direct free carrier generation upon illumination of SubNc, but due to a field-assisted exciton dissociation mechanism specific to the device configuration. Subsequently, the implications of this effect in bilayer organic solar cells with SubNc as the donor are demonstrated, showing that the external and internal quantum efficiencies in such cells are independent of the donor-acceptor interface energetics. This previously unexplored mechanism results in efficient photocurrent generation even though the driving force is minimized and the open-circuit voltage is maximized. Journal Article Advanced Energy Materials 10 47 2002124 Wiley 1614-6832 1614-6840 charge generation; driving force; field‐dependent; organic solar cells; ultrafast spectroscopy 15 12 2020 2020-12-15 10.1002/aenm.202002124 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2021-01-26T16:01:06.6909759 2020-12-03T10:28:08.2051819 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Vasileios C. Nikolis 1 Yifan Dong 2 Jonas Kublitski 3 Johannes Benduhn 4 Xijia Zheng 5 Chengye Huang 6 A. Celil Yüzer 7 Mine Ince 8 Donato Spoltore 9 James Durrant 0000-0001-8353-7345 10 Artem A. Bakulin 11 Koen Vandewal 12 55819__19185__9afc43a0e1984d29a30a3fc6854eb09a.pdf 55819.pdf 2021-01-26T15:58:57.7859756 Output 1025938 application/pdf Version of Record true © 2020 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 |
Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells |
spellingShingle |
Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells James Durrant |
title_short |
Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells |
title_full |
Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells |
title_fullStr |
Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells |
title_full_unstemmed |
Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells |
title_sort |
Field Effect versus Driving Force: Charge Generation in Small‐Molecule Organic Solar Cells |
author_id_str_mv |
f3dd64bc260e5c07adfa916c27dbd58a |
author_id_fullname_str_mv |
f3dd64bc260e5c07adfa916c27dbd58a_***_James Durrant |
author |
James Durrant |
author2 |
Vasileios C. Nikolis Yifan Dong Jonas Kublitski Johannes Benduhn Xijia Zheng Chengye Huang A. Celil Yüzer Mine Ince Donato Spoltore James Durrant Artem A. Bakulin Koen Vandewal |
format |
Journal article |
container_title |
Advanced Energy Materials |
container_volume |
10 |
container_issue |
47 |
container_start_page |
2002124 |
publishDate |
2020 |
institution |
Swansea University |
issn |
1614-6832 1614-6840 |
doi_str_mv |
10.1002/aenm.202002124 |
publisher |
Wiley |
college_str |
Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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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 |
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description |
Efficient charge generation in organic semiconductors usually requires an interface with an energetic gradient between an electron donor and an electron acceptor in order to dissociate the photogenerated excitons. However, single-component organic solar cells based on chloroboron subnaphthalocyanine (SubNc) have been reported to provide considerable photocurrents despite the absence of an energy gradient at the interface with an acceptor. In this work, it is shown that this is not due to direct free carrier generation upon illumination of SubNc, but due to a field-assisted exciton dissociation mechanism specific to the device configuration. Subsequently, the implications of this effect in bilayer organic solar cells with SubNc as the donor are demonstrated, showing that the external and internal quantum efficiencies in such cells are independent of the donor-acceptor interface energetics. This previously unexplored mechanism results in efficient photocurrent generation even though the driving force is minimized and the open-circuit voltage is maximized. |
published_date |
2020-12-15T04:10:18Z |
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1763753715335954432 |
score |
11.021648 |