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

Martin Stolterfoht, Safa Shoaee, Ardalan Armin, 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, 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
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa38542
first_indexed 2018-02-15T14:38:43Z
last_indexed 2018-07-30T19:25:54Z
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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 Ardalan Armin Ardalan Armin true false 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 2018-02-15 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 COLLEGE CODE 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 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 2017-02-22T07:23:43Z
_version_ 1822023507911901184
score 11.085372

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