Photophysical Study of DPPTT-T/PC70 BM Blends and Solar Devices as a Function of Fullerene Loading: An Insight into EQE Limitations of DPP-Based Polymers

Handle URI:
http://hdl.handle.net/10754/622786
Title:
Photophysical Study of DPPTT-T/PC70 BM Blends and Solar Devices as a Function of Fullerene Loading: An Insight into EQE Limitations of DPP-Based Polymers
Authors:
Collado-Fregoso, Elisa; Deledalle, Florent; Utzat, Hendrik; Tuladhar, Pabitra S.; Dimitrov, Stoichko D.; Gillett, Alexander; Tan, Ching Hong; Zhang, Weimin; McCulloch, Iain ( 0000-0002-6340-7217 ) ; Durrant, James R.
Abstract:
Diketopyrrolopyrrole (DPP)-based polymers have been consistently used for the fabrication of solar cell devices and transistors due to the existence of intermolecular short contacts, resulting in high electron and hole mobilities. However, they also often show limited external quantum efficiencies (EQEs). In this contribution, the authors analyze the limitations on EQE by a combined study of exciton dissociation efficiency, charge separation, and recombination kinetics in thin films and solar devices of a DPP-based donor polymer, DPPTT-T (thieno[3,2-b]thiophene-diketopyrrolopyrrole copolymer) blended with varying weight fractions of the fullerene acceptor PCBM. From the correlations between photoluminescence quenching, transient absorption studies, and EQE measurements, it is concluded that the main limitation of photon-to-charge conversion in DPPTT-T/PCBM devices is poor exciton dissociation. This exciton quenching limit is related not only to the low affinity/miscibility of the materials, as confirmed by wide angle X-ray diffraction diffraction and transmission electron microscopy data, but also to the relatively short DPPTT-T singlet exciton lifetime, possibly associated with high nonradiative losses. A further strategy to improve EQE in this class of polymers without sacrificing the good extraction properties in optimized blends is therefore to limit those nonradiative decay processes.
KAUST Department:
KSC; King Abdullah University of Science and Technology; Thuwal 23955-6900 Saudi Arabia
Citation:
Collado-Fregoso E, Deledalle F, Utzat H, Tuladhar PS, Dimitrov SD, et al. (2016) Photophysical Study of DPPTT-T/PC70 BM Blends and Solar Devices as a Function of Fullerene Loading: An Insight into EQE Limitations of DPP-Based Polymers. Advanced Functional Materials: 1604426. Available: http://dx.doi.org/10.1002/adfm.201604426.
Publisher:
Wiley-Blackwell
Journal:
Advanced Functional Materials
Issue Date:
27-Dec-2016
DOI:
10.1002/adfm.201604426
Type:
Article
ISSN:
1616-301X
Sponsors:
The authors gratefully acknowledge the Engineering and Physical Science Research Council, EPSRC (EP/IO1927B/1, EP/M023532/1, and EP/K011987/1) for funding. E.C.-F. also thanks CONACyT (scholarship 309929) and the Kernahan Fund from Imperial College London for funding. The authors are also grateful to Prof. Jenny Nelson, Prof. Sophia Hayes, and Michelle Vezie for fruitful discussions and Pabitra Shakya for device fabrication.
Additional Links:
http://onlinelibrary.wiley.com/doi/10.1002/adfm.201604426/full
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DC FieldValue Language
dc.contributor.authorCollado-Fregoso, Elisaen
dc.contributor.authorDeledalle, Florenten
dc.contributor.authorUtzat, Hendriken
dc.contributor.authorTuladhar, Pabitra S.en
dc.contributor.authorDimitrov, Stoichko D.en
dc.contributor.authorGillett, Alexanderen
dc.contributor.authorTan, Ching Hongen
dc.contributor.authorZhang, Weiminen
dc.contributor.authorMcCulloch, Iainen
dc.contributor.authorDurrant, James R.en
dc.date.accessioned2017-01-29T13:51:39Z-
dc.date.available2017-01-29T13:51:39Z-
dc.date.issued2016-12-27en
dc.identifier.citationCollado-Fregoso E, Deledalle F, Utzat H, Tuladhar PS, Dimitrov SD, et al. (2016) Photophysical Study of DPPTT-T/PC70 BM Blends and Solar Devices as a Function of Fullerene Loading: An Insight into EQE Limitations of DPP-Based Polymers. Advanced Functional Materials: 1604426. Available: http://dx.doi.org/10.1002/adfm.201604426.en
dc.identifier.issn1616-301Xen
dc.identifier.doi10.1002/adfm.201604426en
dc.identifier.urihttp://hdl.handle.net/10754/622786-
dc.description.abstractDiketopyrrolopyrrole (DPP)-based polymers have been consistently used for the fabrication of solar cell devices and transistors due to the existence of intermolecular short contacts, resulting in high electron and hole mobilities. However, they also often show limited external quantum efficiencies (EQEs). In this contribution, the authors analyze the limitations on EQE by a combined study of exciton dissociation efficiency, charge separation, and recombination kinetics in thin films and solar devices of a DPP-based donor polymer, DPPTT-T (thieno[3,2-b]thiophene-diketopyrrolopyrrole copolymer) blended with varying weight fractions of the fullerene acceptor PCBM. From the correlations between photoluminescence quenching, transient absorption studies, and EQE measurements, it is concluded that the main limitation of photon-to-charge conversion in DPPTT-T/PCBM devices is poor exciton dissociation. This exciton quenching limit is related not only to the low affinity/miscibility of the materials, as confirmed by wide angle X-ray diffraction diffraction and transmission electron microscopy data, but also to the relatively short DPPTT-T singlet exciton lifetime, possibly associated with high nonradiative losses. A further strategy to improve EQE in this class of polymers without sacrificing the good extraction properties in optimized blends is therefore to limit those nonradiative decay processes.en
dc.description.sponsorshipThe authors gratefully acknowledge the Engineering and Physical Science Research Council, EPSRC (EP/IO1927B/1, EP/M023532/1, and EP/K011987/1) for funding. E.C.-F. also thanks CONACyT (scholarship 309929) and the Kernahan Fund from Imperial College London for funding. The authors are also grateful to Prof. Jenny Nelson, Prof. Sophia Hayes, and Michelle Vezie for fruitful discussions and Pabitra Shakya for device fabrication.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/adfm.201604426/fullen
dc.subjectDonor-acceptor compositionen
dc.subjectDPP-based solar cellsen
dc.subjectEQE limitationsen
dc.subjectOrganic photovoltaicsen
dc.titlePhotophysical Study of DPPTT-T/PC70 BM Blends and Solar Devices as a Function of Fullerene Loading: An Insight into EQE Limitations of DPP-Based Polymersen
dc.typeArticleen
dc.contributor.departmentKSC; King Abdullah University of Science and Technology; Thuwal 23955-6900 Saudi Arabiaen
dc.identifier.journalAdvanced Functional Materialsen
dc.contributor.institutionCentre for Plastic Electronics; Department of Chemistry; Imperial College London; Exhibition Road London SW7 2AZ UKen
dc.contributor.institutionDepartment of Chemistry; MIT; 77 Massachusetts Ave. Room 2-216 Cambridge MA 02139 USAen
dc.contributor.institutionCavendish Laboratory; Department of Physics; University of Cambridge; J J Thomson Ave Cambridge CB3 0HE UKen
dc.contributor.institutionSPECIFIC IKC; College of Engineering; Swansea University; Central Avenue Baglan, Port Talbot SA12 7AX UKen
kaust.authorMcCulloch, Iainen
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