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Reduced Recombination in High Efficiency Molecular Nematic Liquid Crystalline: Fullerene Solar Cells

Ardalan Armin Orcid Logo, Jegadesan Subbiah, Martin Stolterfoht, Safa Shoaee, Zeyun Xiao, Shirong Lu, David J. Jones, Paul Meredith Orcid Logo

Advanced Energy Materials, Volume: 6, Issue: 22, Start page: 1600939

Swansea University Authors: Ardalan Armin Orcid Logo, Paul Meredith Orcid Logo

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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...

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Published in: Advanced Energy Materials
ISSN: 1614-6832
Published: Wiley 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa33778
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spelling 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
container_issue 22
container_start_page 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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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 1
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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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score 10.997637

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