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Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction

Seyed Mehrdad Hosseini, Steffen Roland, Jona Kurpiers, Zhiming Chen, Kai Zhang, Fei Huang, Ardalan Armin, Dieter Neher, Safa Shoaee

The Journal of Physical Chemistry C, Volume: 123, Issue: 11, Pages: 6823 - 6830

Swansea University Author: Ardalan Armin

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DOI (Published version): 10.1021/acs.jpcc.8b11669

Abstract

Power conversion efficiency of nonfullerene organic solar cells have now increased beyond the record of their fullerene-based counterparts. There remain many fundamental questions about their working principles such as charge generation and extraction and losses in these systems. Herein, we present...

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Published in: The Journal of Physical Chemistry C
ISSN: 1932-7447 1932-7455
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa49632
first_indexed 2019-03-19T19:57:56Z
last_indexed 2019-03-29T12:39:21Z
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spelling 2019-03-28T12:05:43.9422914 v2 49632 2019-03-19 Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction 22b270622d739d81e131bec7a819e2fd Ardalan Armin Ardalan Armin true false 2019-03-19 Power conversion efficiency of nonfullerene organic solar cells have now increased beyond the record of their fullerene-based counterparts. There remain many fundamental questions about their working principles such as charge generation and extraction and losses in these systems. Herein, we present a comparative study of bulk heterojunction solar cells composed of a recently introduced nappthothiadiazole-based polymer (NT812) as the electron donor and two different acceptor molecules, namely PCBM[70] and ITIC. A comparison between photovoltaic performance of these two types of solar cells reveals that the open circuit voltage (Voc) of NT812:ITIC based solar cell is larger but the fill factor (FF) lower than that of NT812:PCBM[70] device. We find the key reason behind this reduced FF in the ITIC-based device to be faster non-geminate recombination relative to NT812:PCBM[70] system, which has previously been assigned to sub-optimum morphology. Nevertheless, NT812:ITIC system is more emissive than NT812:PCBM[70] resulting in smaller non-radiative Voc-loss. Suppression of bimolecular recombination together with reduced non-radiative Voc-loss can be considered as a key optimization route in the development of non-fullerene-based solar cells. Journal Article The Journal of Physical Chemistry C 123 11 6823 6830 1932-7447 1932-7455 20 2 2019 2019-02-20 10.1021/acs.jpcc.8b11669 COLLEGE NANME COLLEGE CODE Swansea University 2019-03-28T12:05:43.9422914 2019-03-19T16:25:39.8952515 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Seyed Mehrdad Hosseini 1 Steffen Roland 2 Jona Kurpiers 3 Zhiming Chen 4 Kai Zhang 5 Fei Huang 6 Ardalan Armin 7 Dieter Neher 8 Safa Shoaee 9 0049632-28032019120348.pdf 49632.pdf 2019-03-28T12:03:48.2030000 Output 2022962 application/pdf Accepted Manuscript true 2020-02-20T00:00:00.0000000 true eng
title Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
spellingShingle Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
Ardalan Armin
title_short Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
title_full Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
title_fullStr Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
title_full_unstemmed Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
title_sort Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
author_id_str_mv 22b270622d739d81e131bec7a819e2fd
author_id_fullname_str_mv 22b270622d739d81e131bec7a819e2fd_***_Ardalan Armin
author Ardalan Armin
author2 Seyed Mehrdad Hosseini
Steffen Roland
Jona Kurpiers
Zhiming Chen
Kai Zhang
Fei Huang
Ardalan Armin
Dieter Neher
Safa Shoaee
format Journal article
container_title The Journal of Physical Chemistry C
container_volume 123
container_issue 11
container_start_page 6823
publishDate 2019
institution Swansea University
issn 1932-7447
1932-7455
doi_str_mv 10.1021/acs.jpcc.8b11669
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 1
active_str 0
description Power conversion efficiency of nonfullerene organic solar cells have now increased beyond the record of their fullerene-based counterparts. There remain many fundamental questions about their working principles such as charge generation and extraction and losses in these systems. Herein, we present a comparative study of bulk heterojunction solar cells composed of a recently introduced nappthothiadiazole-based polymer (NT812) as the electron donor and two different acceptor molecules, namely PCBM[70] and ITIC. A comparison between photovoltaic performance of these two types of solar cells reveals that the open circuit voltage (Voc) of NT812:ITIC based solar cell is larger but the fill factor (FF) lower than that of NT812:PCBM[70] device. We find the key reason behind this reduced FF in the ITIC-based device to be faster non-geminate recombination relative to NT812:PCBM[70] system, which has previously been assigned to sub-optimum morphology. Nevertheless, NT812:ITIC system is more emissive than NT812:PCBM[70] resulting in smaller non-radiative Voc-loss. Suppression of bimolecular recombination together with reduced non-radiative Voc-loss can be considered as a key optimization route in the development of non-fullerene-based solar cells.
published_date 2019-02-20T07:43:34Z
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