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Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells

Aren Yazmaciyan, Martin Stolterfoht, Paul L. Burn, Qianqian Lin, Paul Meredith Orcid Logo, Ardalan Armin Orcid Logo

Advanced Energy Materials, Start page: 1703339

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

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DOI (Published version): 10.1002/aenm.201703339

Abstract

Achieving the highest power conversion efficiencies in bulk heterojunction organic solar cells requires a morphology that delivers electron and hole percolation pathways for optimized transport, plus sufficient donor:acceptor contact area for near unity charge transfer state formation. This is a sig...

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Published in: Advanced Energy Materials
ISSN: 16146832
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa39322
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first_indexed 2018-04-06T13:28:29Z
last_indexed 2020-07-13T18:58:48Z
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spelling 2020-07-13T14:03:13.5057129 v2 39322 2018-04-06 Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells 31e8fe57fa180d418afd48c3af280c2e 0000-0002-9049-7414 Paul Meredith Paul Meredith true false 22b270622d739d81e131bec7a819e2fd 0000-0002-6129-5354 Ardalan Armin Ardalan Armin true false 2018-04-06 SPH Achieving the highest power conversion efficiencies in bulk heterojunction organic solar cells requires a morphology that delivers electron and hole percolation pathways for optimized transport, plus sufficient donor:acceptor contact area for near unity charge transfer state formation. This is a significant structural challenge, particularly in semiconducting polymer:fullerene systems. This balancing act in the model high efficiency PTB7:PC70BM blend is studied by tuning the donor:acceptor ratio, with a view to understanding the recombination loss mechanisms above and below the fullerene transport percolation threshold. The internal quantum efficiency is found to be strongly correlated to the slower carrier mobility in agreement with other recent studies. Furthermore, second‐order recombination losses dominate the shape of the current density–voltage curve in efficient blend combinations, where the fullerene phase is percolated. However, below the charge transport percolation threshold, there is an electric‐field dependence of first‐order losses, which includes electric‐field‐dependent photogeneration. In the intermediate regime, the fill factor appears to be limited by both first‐ and second‐order losses. These findings provide additional basic understanding of the interplay between the bulk heterojunction morphology and the order of recombination in organic solar cells. They also shed light on the limitations of widely used transport models below the percolation threshold. Journal Article Advanced Energy Materials 1703339 16146832 25 6 2018 2018-06-25 10.1002/aenm.201703339 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2020-07-13T14:03:13.5057129 2018-04-06T11:25:23.8948011 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Aren Yazmaciyan 1 Martin Stolterfoht 2 Paul L. Burn 3 Qianqian Lin 4 Paul Meredith 0000-0002-9049-7414 5 Ardalan Armin 0000-0002-6129-5354 6
title Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells
spellingShingle Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells
Paul Meredith
Ardalan Armin
title_short Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells
title_full Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells
title_fullStr Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells
title_full_unstemmed Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells
title_sort Recombination Losses Above and Below the Transport Percolation Threshold in Bulk Heterojunction Organic Solar Cells
author_id_str_mv 31e8fe57fa180d418afd48c3af280c2e
22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv 31e8fe57fa180d418afd48c3af280c2e_***_Paul Meredith
22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
author Paul Meredith
Ardalan Armin
author2 Aren Yazmaciyan
Martin Stolterfoht
Paul L. Burn
Qianqian Lin
Paul Meredith
Ardalan Armin
format Journal article
container_title Advanced Energy Materials
container_start_page 1703339
publishDate 2018
institution Swansea University
issn 16146832
doi_str_mv 10.1002/aenm.201703339
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 Achieving the highest power conversion efficiencies in bulk heterojunction organic solar cells requires a morphology that delivers electron and hole percolation pathways for optimized transport, plus sufficient donor:acceptor contact area for near unity charge transfer state formation. This is a significant structural challenge, particularly in semiconducting polymer:fullerene systems. This balancing act in the model high efficiency PTB7:PC70BM blend is studied by tuning the donor:acceptor ratio, with a view to understanding the recombination loss mechanisms above and below the fullerene transport percolation threshold. The internal quantum efficiency is found to be strongly correlated to the slower carrier mobility in agreement with other recent studies. Furthermore, second‐order recombination losses dominate the shape of the current density–voltage curve in efficient blend combinations, where the fullerene phase is percolated. However, below the charge transport percolation threshold, there is an electric‐field dependence of first‐order losses, which includes electric‐field‐dependent photogeneration. In the intermediate regime, the fill factor appears to be limited by both first‐ and second‐order losses. These findings provide additional basic understanding of the interplay between the bulk heterojunction morphology and the order of recombination in organic solar cells. They also shed light on the limitations of widely used transport models below the percolation threshold.
published_date 2018-06-25T03:49:56Z
_version_ 1763752433188601856
score 11.037603

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