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Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages

D. Baran, T. Kirchartz, S. Wheeler, S. Dimitrov, M. Abdelsamie, J. Gorman, R. S. Ashraf, S. Holliday, A. Wadsworth, N. Gasparini, P. Kaienburg, H. Yan, A. Amassian, C. J. Brabec, J. R. Durrant, I. McCulloch, Stoichko Dimitrov Orcid Logo

Energy Environ. Sci., Volume: 9, Issue: 12, Pages: 3783 - 3793

Swansea University Author: Stoichko Dimitrov Orcid Logo

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DOI (Published version): 10.1039/C6EE02598F

Abstract

Optimization of the energy levels at the donor–acceptor interface of organic solar cells has driven their efficiencies to above 10%. However, further improvements towards efficiencies comparable with inorganic solar cells remain challenging because of high recombination losses, which empirically lim...

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Published in: Energy Environ. Sci.
ISSN: 1754-5692 1754-5706
Published: The Royal Society of Chemistry 2016
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URI: https://cronfa.swan.ac.uk/Record/cronfa32017
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Here we show that this empirical limit can be overcome using non-fullerene acceptors blended with the low band gap polymer PffBT4T-2DT leading to efficiencies approaching 10% (9.95%). We achieve Voc up to 1.12 V, which corresponds to a loss of only Eg/q &#x2212; Voc = 0.5 &#xB1; 0.01 V between the optical bandgap Eg of the polymer and Voc. This high Voc is shown to be associated with the achievement of remarkably low non-geminate and non-radiative recombination losses in these devices. Suppression of non-radiative recombination implies high external electroluminescence quantum efficiencies which are orders of magnitude higher than those of equivalent devices employing fullerene acceptors. Using the balance between reduced recombination losses and good photocurrent generation efficiencies achieved experimentally as a baseline for simulations of the efficiency potential of organic solar cells, we estimate that efficiencies of up to 20% are achievable if band gaps and fill factors are further optimized.</abstract><type>Journal Article</type><journal>Energy Environ. 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R.</firstname><surname>Durrant</surname><order>15</order></author><author><firstname>I.</firstname><surname>McCulloch</surname><order>16</order></author><author><firstname>Stoichko</firstname><surname>Dimitrov</surname><orcid>0000-0002-1564-7080</orcid><order>17</order></author></authors><documents><document><filename>0032017-21022017123952.pdf</filename><originalFilename>baran2016.pdf</originalFilename><uploaded>2017-02-21T12:39:52.8170000</uploaded><type>Output</type><contentLength>2440903</contentLength><contentType>application/pdf</contentType><version>Version of Record</version><cronfaStatus>true</cronfaStatus><embargoDate>2017-02-21T00:00:00.0000000</embargoDate><copyrightCorrect>false</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2017-07-07T11:55:37.1586412 v2 32017 2017-02-20 Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages 9fc26ec1b8655cd0d66f7196a924fe14 0000-0002-1564-7080 Stoichko Dimitrov Stoichko Dimitrov true false 2017-02-20 EEN Optimization of the energy levels at the donor–acceptor interface of organic solar cells has driven their efficiencies to above 10%. However, further improvements towards efficiencies comparable with inorganic solar cells remain challenging because of high recombination losses, which empirically limit the open-circuit voltage (Voc) to typically less than 1 V. Here we show that this empirical limit can be overcome using non-fullerene acceptors blended with the low band gap polymer PffBT4T-2DT leading to efficiencies approaching 10% (9.95%). We achieve Voc up to 1.12 V, which corresponds to a loss of only Eg/q − Voc = 0.5 ± 0.01 V between the optical bandgap Eg of the polymer and Voc. This high Voc is shown to be associated with the achievement of remarkably low non-geminate and non-radiative recombination losses in these devices. Suppression of non-radiative recombination implies high external electroluminescence quantum efficiencies which are orders of magnitude higher than those of equivalent devices employing fullerene acceptors. Using the balance between reduced recombination losses and good photocurrent generation efficiencies achieved experimentally as a baseline for simulations of the efficiency potential of organic solar cells, we estimate that efficiencies of up to 20% are achievable if band gaps and fill factors are further optimized. Journal Article Energy Environ. Sci. 9 12 3783 3793 The Royal Society of Chemistry 1754-5692 1754-5706 9 11 2016 2016-11-09 10.1039/C6EE02598F http://dx.doi.org/10.1039/C6EE02598F COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2017-07-07T11:55:37.1586412 2017-02-20T15:49:50.8489511 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised D. Baran 1 T. Kirchartz 2 S. Wheeler 3 S. Dimitrov 4 M. Abdelsamie 5 J. Gorman 6 R. S. Ashraf 7 S. Holliday 8 A. Wadsworth 9 N. Gasparini 10 P. Kaienburg 11 H. Yan 12 A. Amassian 13 C. J. Brabec 14 J. R. Durrant 15 I. McCulloch 16 Stoichko Dimitrov 0000-0002-1564-7080 17 0032017-21022017123952.pdf baran2016.pdf 2017-02-21T12:39:52.8170000 Output 2440903 application/pdf Version of Record true 2017-02-21T00:00:00.0000000 false eng
title Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages
spellingShingle Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages
Stoichko Dimitrov
title_short Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages
title_full Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages
title_fullStr Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages
title_full_unstemmed Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages
title_sort Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages
author_id_str_mv 9fc26ec1b8655cd0d66f7196a924fe14
author_id_fullname_str_mv 9fc26ec1b8655cd0d66f7196a924fe14_***_Stoichko Dimitrov
author Stoichko Dimitrov
author2 D. Baran
T. Kirchartz
S. Wheeler
S. Dimitrov
M. Abdelsamie
J. Gorman
R. S. Ashraf
S. Holliday
A. Wadsworth
N. Gasparini
P. Kaienburg
H. Yan
A. Amassian
C. J. Brabec
J. R. Durrant
I. McCulloch
Stoichko Dimitrov
format Journal article
container_title Energy Environ. Sci.
container_volume 9
container_issue 12
container_start_page 3783
publishDate 2016
institution Swansea University
issn 1754-5692
1754-5706
doi_str_mv 10.1039/C6EE02598F
publisher The Royal Society of Chemistry
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 Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
url http://dx.doi.org/10.1039/C6EE02598F
document_store_str 1
active_str 0
description Optimization of the energy levels at the donor–acceptor interface of organic solar cells has driven their efficiencies to above 10%. However, further improvements towards efficiencies comparable with inorganic solar cells remain challenging because of high recombination losses, which empirically limit the open-circuit voltage (Voc) to typically less than 1 V. Here we show that this empirical limit can be overcome using non-fullerene acceptors blended with the low band gap polymer PffBT4T-2DT leading to efficiencies approaching 10% (9.95%). We achieve Voc up to 1.12 V, which corresponds to a loss of only Eg/q − Voc = 0.5 ± 0.01 V between the optical bandgap Eg of the polymer and Voc. This high Voc is shown to be associated with the achievement of remarkably low non-geminate and non-radiative recombination losses in these devices. Suppression of non-radiative recombination implies high external electroluminescence quantum efficiencies which are orders of magnitude higher than those of equivalent devices employing fullerene acceptors. Using the balance between reduced recombination losses and good photocurrent generation efficiencies achieved experimentally as a baseline for simulations of the efficiency potential of organic solar cells, we estimate that efficiencies of up to 20% are achievable if band gaps and fill factors are further optimized.
published_date 2016-11-09T03:39:09Z
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score 11.013731

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