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

Handle URI:
http://hdl.handle.net/10754/622066
Title:
Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages
Authors:
Baran, D.; Kirchartz, T.; Wheeler, S.; Dimitrov, S.; Abdelsamie, Maged ( 0000-0002-4631-5409 ) ; Gorman, J.; Ashraf, Raja; Holliday, S.; Wadsworth, A.; Gasparini, N.; Kaienburg, P.; Yan, H.; Amassian, Aram ( 0000-0002-5734-1194 ) ; Brabec, C. J.; Durrant, J. R.; McCulloch, Iain ( 0000-0002-6340-7217 )
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 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. © The Royal Society of Chemistry 2016.
KAUST Department:
King Abdullah University of Science and Technology (KAUST), KSC, Thuwal, Saudi Arabia
Citation:
Baran D, Kirchartz T, Wheeler S, Dimitrov S, Abdelsamie M, et al. (2016) Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages. Energy Environ Sci 9: 3783–3793. Available: http://dx.doi.org/10.1039/c6ee02598f.
Publisher:
Royal Society of Chemistry (RSC)
Journal:
Energy Environ. Sci.
Issue Date:
9-Nov-2016
DOI:
10.1039/c6ee02598f
Type:
Article
ISSN:
1754-5692; 1754-5706
Sponsors:
S. H., A. W. and I. M. thanks EC FP7 Project SC2 (610115), EC FP7 Project ArtESun (604397), and EPSRC Project EP/G037515/1, EC FP7 Project POLYMED (612538). TK acknowledges support from the DFG (Grant KI-1571/2-1).
Additional Links:
http://pubs.rsc.org/en/Content/ArticleLanding/2016/EE/C6EE02598F
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DC FieldValue Language
dc.contributor.authorBaran, D.en
dc.contributor.authorKirchartz, T.en
dc.contributor.authorWheeler, S.en
dc.contributor.authorDimitrov, S.en
dc.contributor.authorAbdelsamie, Mageden
dc.contributor.authorGorman, J.en
dc.contributor.authorAshraf, Rajaen
dc.contributor.authorHolliday, S.en
dc.contributor.authorWadsworth, A.en
dc.contributor.authorGasparini, N.en
dc.contributor.authorKaienburg, P.en
dc.contributor.authorYan, H.en
dc.contributor.authorAmassian, Aramen
dc.contributor.authorBrabec, C. J.en
dc.contributor.authorDurrant, J. R.en
dc.contributor.authorMcCulloch, Iainen
dc.date.accessioned2016-12-22T13:34:56Z-
dc.date.available2016-12-22T13:34:56Z-
dc.date.issued2016-11-09en
dc.identifier.citationBaran D, Kirchartz T, Wheeler S, Dimitrov S, Abdelsamie M, et al. (2016) Reduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltages. Energy Environ Sci 9: 3783–3793. Available: http://dx.doi.org/10.1039/c6ee02598f.en
dc.identifier.issn1754-5692en
dc.identifier.issn1754-5706en
dc.identifier.doi10.1039/c6ee02598fen
dc.identifier.urihttp://hdl.handle.net/10754/622066-
dc.description.abstractOptimization 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. © The Royal Society of Chemistry 2016.en
dc.description.sponsorshipS. H., A. W. and I. M. thanks EC FP7 Project SC2 (610115), EC FP7 Project ArtESun (604397), and EPSRC Project EP/G037515/1, EC FP7 Project POLYMED (612538). TK acknowledges support from the DFG (Grant KI-1571/2-1).en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.relation.urlhttp://pubs.rsc.org/en/Content/ArticleLanding/2016/EE/C6EE02598Fen
dc.rightsThis article is licensed under a Creative Commons Attribution 3.0 Unported Licence.en
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en
dc.titleReduced voltage losses yield 10% efficient fullerene free organic solar cells with >1 V open circuit voltagesen
dc.typeArticleen
dc.contributor.departmentKing Abdullah University of Science and Technology (KAUST), KSC, Thuwal, Saudi Arabiaen
dc.identifier.journalEnergy Environ. Sci.en
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Chemistry and Centre for Plastic Electronics, Imperial College London, London, United Kingdomen
dc.contributor.institutionIEK5-Photovoltaics, Forschungszentrum Jülich, Jülich, Germanyen
dc.contributor.institutionFaculty of Engineering, CENIDE, University of Duisburg-Essen, Carl-Benz-Straße 199, Duisburg, Germanyen
dc.contributor.institutionUniversity of Washington, Materials Science and Engineering Department, Seattle, WA, United Statesen
dc.contributor.institutionInstitute of Materials for Electronics and Energy Technology (I-MEET), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germanyen
dc.contributor.institutionDepartment of Chemistry, Hong Kong Br. of Chinese Natl. Engineering Research Center for Tissue Restoration and Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kongen
kaust.authorAbdelsamie, Mageden
kaust.authorAshraf, Rajaen
kaust.authorAmassian, Aramen
kaust.authorMcCulloch, Iainen
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