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Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells
Ardalan Armin
,
Jegadesan Subbiah,
Martin Stolterfoht,
Safa Shoaee,
Zeyun Xiao,
Shirong Lu,
David J. Jones,
Paul Meredith
Advanced Energy Materials, Volume: 6, Issue: 22, Start page: 1600939
Swansea University Authors:
Ardalan Armin , Paul Meredith
-
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DOI (Published version): 10.1002/aenm.201600939
Abstract
Bimolecular recombination in bulk heterojunction organic solar cells is theprocess by which nongeminate photogenerated free carriers encounter eachother, and combine to form a charge transfer (CT) state which subsequentlyrelaxes to the ground state. It is governed by the diffusion of the slower andf...
Published in: | Advanced Energy Materials |
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ISSN: | 1614-6832 |
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2016
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2022-12-05T12:25:45.8984639 v2 33778 2017-05-19 Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 2017-05-19 SPH Bimolecular recombination in bulk heterojunction organic solar cells is theprocess by which nongeminate photogenerated free carriers encounter eachother, and combine to form a charge transfer (CT) state which subsequentlyrelaxes to the ground state. It is governed by the diffusion of the slower andfaster carriers toward the electron donor–acceptor interface. In an increasingnumber of systems, the recombination rate constant is measured to be lowerthan that predicted by Langevin’s model for relative Brownian motion and thecapture of opposite charges. This study investigates the dynamics of chargegeneration, transport, and recombination in a nematic liquid crystallinedonor:fullerene acceptor system that gives solar cells with initial power conversionefficiencies of >9.5%. Unusually, and advantageously from a manufacturingperspective, these efficiencies are maintained in junctions thickerthan 300 nm. Despite finding imbalanced and moderate carrier mobilitiesin this blend, strongly suppressed bimolecular recombination is observed,which is ≈150 times less than predicted by Langevin theory, or indeed, morerecent and advanced models that take into account the domain size andthe spatial separation of electrons and holes. The suppressed bimolecularrecombination arises from the fact that ground-state decay of the CT state issignificantly slower than dissociation. Journal Article Advanced Energy Materials 6 22 1600939 Wiley 1614-6832 organic solar cells, reduced bimolecular recombination, nematic liquid crystal donor 1 11 2016 2016-11-01 10.1002/aenm.201600939 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2022-12-05T12:25:45.8984639 2017-05-19T14:53:13.4404650 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Ardalan Armin 0000-0002-6129-5354 1 Jegadesan Subbiah 2 Martin Stolterfoht 3 Safa Shoaee 4 Zeyun Xiao 5 Shirong Lu 6 David J. Jones 7 Paul Meredith 0000-0002-9049-7414 8 33778__17712__c490ea822afc47be8568f8777fd495b7.pdf 33778.pdf 2020-07-14T16:17:58.5172506 Output 804851 application/pdf Accepted Manuscript true 2017-08-23T00:00:00.0000000 true |
title |
Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells |
spellingShingle |
Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells Ardalan Armin Paul Meredith |
title_short |
Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells |
title_full |
Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells |
title_fullStr |
Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells |
title_full_unstemmed |
Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells |
title_sort |
Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells |
author_id_str_mv |
22b270622d739d81e131bec7a819e2fd 31e8fe57fa180d418afd48c3af280c2e |
author_id_fullname_str_mv |
22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin 31e8fe57fa180d418afd48c3af280c2e_***_Paul Meredith |
author |
Ardalan Armin Paul Meredith |
author2 |
Ardalan Armin Jegadesan Subbiah Martin Stolterfoht Safa Shoaee Zeyun Xiao Shirong Lu David J. Jones Paul Meredith |
format |
Journal article |
container_title |
Advanced Energy Materials |
container_volume |
6 |
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22 |
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1600939 |
publishDate |
2016 |
institution |
Swansea University |
issn |
1614-6832 |
doi_str_mv |
10.1002/aenm.201600939 |
publisher |
Wiley |
college_str |
Faculty of Science and Engineering |
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Faculty of Science and Engineering |
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Faculty of Science and Engineering |
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School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics |
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description |
Bimolecular recombination in bulk heterojunction organic solar cells is theprocess by which nongeminate photogenerated free carriers encounter eachother, and combine to form a charge transfer (CT) state which subsequentlyrelaxes to the ground state. It is governed by the diffusion of the slower andfaster carriers toward the electron donor–acceptor interface. In an increasingnumber of systems, the recombination rate constant is measured to be lowerthan that predicted by Langevin’s model for relative Brownian motion and thecapture of opposite charges. This study investigates the dynamics of chargegeneration, transport, and recombination in a nematic liquid crystallinedonor:fullerene acceptor system that gives solar cells with initial power conversionefficiencies of >9.5%. Unusually, and advantageously from a manufacturingperspective, these efficiencies are maintained in junctions thickerthan 300 nm. Despite finding imbalanced and moderate carrier mobilitiesin this blend, strongly suppressed bimolecular recombination is observed,which is ≈150 times less than predicted by Langevin theory, or indeed, morerecent and advanced models that take into account the domain size andthe spatial separation of electrons and holes. The suppressed bimolecularrecombination arises from the fact that ground-state decay of the CT state issignificantly slower than dissociation. |
published_date |
2016-11-01T03:41:51Z |
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1763751925534162944 |
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11.021648 |