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Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells

Martin Stolterfoht, Safa Shoaee, Ardalan Armin Orcid Logo, Hui Jin, Ivan Kassal, Wei Jiang, Paul Burn, Paul Meredith Orcid Logo

Advanced Energy Materials, Volume: 7, Issue: 4, Start page: 1601379

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

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DOI (Published version): 10.1002/aenm.201601379

Abstract

The origin of photocurrent losses in the power-generating regime of organic solar cells (OSCs) remains a controversial topic, although recent literature suggests that the competition between bimolecular recombination and charge extraction determines the bias dependence of the photocurrent. Here we s...

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Published in: Advanced Energy Materials
ISSN: 16146832
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa38542
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first_indexed 2018-02-15T14:38:43Z
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spelling 2018-07-30T16:27:43.1757926 v2 38542 2018-02-15 Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 2018-02-15 SPH The origin of photocurrent losses in the power-generating regime of organic solar cells (OSCs) remains a controversial topic, although recent literature suggests that the competition between bimolecular recombination and charge extraction determines the bias dependence of the photocurrent. Here we studied the steady-state recombination dynamics in bulk-heterojunction OSCs with different hole mobilities from short-circuit to maximum power point. We show that in this regime, in contrast to previous transient extracted charge and absorption spectroscopy studies, first-order recombination outweighs bimolecular recombination of photo-generated charge carriers. We demonstrate that the first-order losses increase with decreasing slower carrier mobility, and attribute them to either mobilization of charges trapped at the donor:acceptor interface through the Poole-Frenkel effect, and/or recombination of photogenerated and injected charges. The dependence of both first-order and higher-order losses on the slower carrier mobility explains why the field dependence of OSC efficiencies are historically to charge-extraction losses. Journal Article Advanced Energy Materials 7 4 1601379 16146832 22 2 2017 2017-02-22 10.1002/aenm.201601379 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2018-07-30T16:27:43.1757926 2018-02-15T08:32:23.0044343 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Martin Stolterfoht 1 Safa Shoaee 2 Ardalan Armin 0000-0002-6129-5354 3 Hui Jin 4 Ivan Kassal 5 Wei Jiang 6 Paul Burn 7 Paul Meredith 0000-0002-9049-7414 8
title Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells
spellingShingle Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells
Ardalan Armin
Paul Meredith
title_short Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells
title_full Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells
title_fullStr Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells
title_full_unstemmed Electric Field and Mobility Dependent First-Order Recombination Losses in Organic Solar Cells
title_sort Electric Field and Mobility Dependent First-Order Recombination Losses in Organic 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 Martin Stolterfoht
Safa Shoaee
Ardalan Armin
Hui Jin
Ivan Kassal
Wei Jiang
Paul Burn
Paul Meredith
format Journal article
container_title Advanced Energy Materials
container_volume 7
container_issue 4
container_start_page 1601379
publishDate 2017
institution Swansea University
issn 16146832
doi_str_mv 10.1002/aenm.201601379
college_str Faculty of Science and Engineering
hierarchytype
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 0
active_str 0
description The origin of photocurrent losses in the power-generating regime of organic solar cells (OSCs) remains a controversial topic, although recent literature suggests that the competition between bimolecular recombination and charge extraction determines the bias dependence of the photocurrent. Here we studied the steady-state recombination dynamics in bulk-heterojunction OSCs with different hole mobilities from short-circuit to maximum power point. We show that in this regime, in contrast to previous transient extracted charge and absorption spectroscopy studies, first-order recombination outweighs bimolecular recombination of photo-generated charge carriers. We demonstrate that the first-order losses increase with decreasing slower carrier mobility, and attribute them to either mobilization of charges trapped at the donor:acceptor interface through the Poole-Frenkel effect, and/or recombination of photogenerated and injected charges. The dependence of both first-order and higher-order losses on the slower carrier mobility explains why the field dependence of OSC efficiencies are historically to charge-extraction losses.
published_date 2017-02-22T03:48:45Z
_version_ 1763752359697055744
score 11.037603

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