The effect of phase morphology on the nature of long-lived charges in semiconductor polymer:fullerene systems

Handle URI:
http://hdl.handle.net/10754/594161
Title:
The effect of phase morphology on the nature of long-lived charges in semiconductor polymer:fullerene systems
Authors:
Dou, Fei; Domingo, Ester; Sakowicz, Maciej; Rezasoltani, Elham; McCarthy-Ward, Thomas; Heeney, Martin; Zhang, Xinping; Stingelin, Natalie; Silva, Carlos
Abstract:
In this work, we investigate the effect of phase morphology on the nature of charges in poly(2,5-bis(3-tetradecyl-thiophen-2-yl)thieno[3,2,-b]thiophene) (pBTTT-C16) and phenyl-C61-butyric acid methyl ester (PC61BM) blends over timescales greater than hundreds of microseconds by quasi-steady-state photoinduced absorption spectroscopy. Specifically, we compare an essentially fully intermixed, one-phase system based on a 1 : 1 (by weight) pBTTT-C16 : PC61BM blend, known to form a co-crystal structure, with a two-phase morphology composed of relatively material-pure domains of the neat polymer and neat fullerene. The co-crystal occurs at a composition of up to 50 wt% PC61BM, because pBTTT-C16 is capable of hosting fullerene derivatives such as PC61BM in the cavities between its side chains. In contrast, the predominantly two-phase system can be obtained by manipulating a 1 : 1 polymer : fullerene blend with the assistance of a fatty acid methyl ester (dodecanoic acid methyl ester, Me12) as additive, which hinders co-crystal formation. We find that triplet excitons and polarons are generated in both phase morphologies. However, polarons are generated in the predominantly two-phase system at higher photon energy than for the structure based on the co-crystal phase. By means of a quasi-steady-state solution of a mesoscopic rate model, we demonstrate that the steady-state polaron generation efficiency and recombination rates are higher in the finely intermixed, one-phase system compared to the predominantly phase-pure, two-phase morphology. We suggest that the polarons generated in highly intermixed structures, such as the co-crystal investigated here, are localised polarons while those generated in the phase-separated polymer and fullerene systems are delocalised polarons. We expect this picture to apply generally to other organic-based heterojunctions of complex phase morphologies including donor:acceptor systems that form, for instance, molecularly mixed amorphous solid solutions, underlining the generality of the understanding gained here. © 2015 The Royal Society of Chemistry.
KAUST Department:
KAUST Solar Center (KSC); Physical Sciences and Engineering (PSE) Division
Citation:
Dou F, Buchaca-Domingo E, Sakowicz M, Rezasoltani E, McCarthy-Ward T, et al. (2015) The effect of phase morphology on the nature of long-lived charges in semiconductor polymer:fullerene systems. J Mater Chem C 3: 3722–3729. Available: http://dx.doi.org/10.1039/c4tc02637c.
Publisher:
Royal Society of Chemistry (RSC)
Journal:
J. Mater. Chem. C
Issue Date:
2015
DOI:
10.1039/c4tc02637c
Type:
Article
ISSN:
2050-7526; 2050-7534
Sponsors:
CS acknowledges funding from the Natural Science and Engineering Research Council of Canada and the Canada Research Chair in Organic Semiconductor Materials; FD acknowledges funding through scholarships from the Royal Society K. C. Wang Postdoctoral Fellowship, the International Postdoctoral Exchange Fellowship Program, the Joint-PhD program founded by China Scholarship Council, and the Quebec's Ministere de l'Education, du Loisir, et du Sport (MELS); MS is supported by a postdoctoral fellowship from MELS; and NS is supported by a European Research Council (ERC) Starting Independent Researcher Fellowship under the grant agreement No. 279587. Furthermore, this work was supported by KAUST through a Competitive Research Grant (CRG-1-2012-THO-015-IMP).
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; KAUST Solar Center (KSC)

Full metadata record

DC FieldValue Language
dc.contributor.authorDou, Feien
dc.contributor.authorDomingo, Esteren
dc.contributor.authorSakowicz, Maciejen
dc.contributor.authorRezasoltani, Elhamen
dc.contributor.authorMcCarthy-Ward, Thomasen
dc.contributor.authorHeeney, Martinen
dc.contributor.authorZhang, Xinpingen
dc.contributor.authorStingelin, Natalieen
dc.contributor.authorSilva, Carlosen
dc.date.accessioned2016-01-19T13:22:56Zen
dc.date.available2016-01-19T13:22:56Zen
dc.date.issued2015en
dc.identifier.citationDou F, Buchaca-Domingo E, Sakowicz M, Rezasoltani E, McCarthy-Ward T, et al. (2015) The effect of phase morphology on the nature of long-lived charges in semiconductor polymer:fullerene systems. J Mater Chem C 3: 3722–3729. Available: http://dx.doi.org/10.1039/c4tc02637c.en
dc.identifier.issn2050-7526en
dc.identifier.issn2050-7534en
dc.identifier.doi10.1039/c4tc02637cen
dc.identifier.urihttp://hdl.handle.net/10754/594161en
dc.description.abstractIn this work, we investigate the effect of phase morphology on the nature of charges in poly(2,5-bis(3-tetradecyl-thiophen-2-yl)thieno[3,2,-b]thiophene) (pBTTT-C16) and phenyl-C61-butyric acid methyl ester (PC61BM) blends over timescales greater than hundreds of microseconds by quasi-steady-state photoinduced absorption spectroscopy. Specifically, we compare an essentially fully intermixed, one-phase system based on a 1 : 1 (by weight) pBTTT-C16 : PC61BM blend, known to form a co-crystal structure, with a two-phase morphology composed of relatively material-pure domains of the neat polymer and neat fullerene. The co-crystal occurs at a composition of up to 50 wt% PC61BM, because pBTTT-C16 is capable of hosting fullerene derivatives such as PC61BM in the cavities between its side chains. In contrast, the predominantly two-phase system can be obtained by manipulating a 1 : 1 polymer : fullerene blend with the assistance of a fatty acid methyl ester (dodecanoic acid methyl ester, Me12) as additive, which hinders co-crystal formation. We find that triplet excitons and polarons are generated in both phase morphologies. However, polarons are generated in the predominantly two-phase system at higher photon energy than for the structure based on the co-crystal phase. By means of a quasi-steady-state solution of a mesoscopic rate model, we demonstrate that the steady-state polaron generation efficiency and recombination rates are higher in the finely intermixed, one-phase system compared to the predominantly phase-pure, two-phase morphology. We suggest that the polarons generated in highly intermixed structures, such as the co-crystal investigated here, are localised polarons while those generated in the phase-separated polymer and fullerene systems are delocalised polarons. We expect this picture to apply generally to other organic-based heterojunctions of complex phase morphologies including donor:acceptor systems that form, for instance, molecularly mixed amorphous solid solutions, underlining the generality of the understanding gained here. © 2015 The Royal Society of Chemistry.en
dc.description.sponsorshipCS acknowledges funding from the Natural Science and Engineering Research Council of Canada and the Canada Research Chair in Organic Semiconductor Materials; FD acknowledges funding through scholarships from the Royal Society K. C. Wang Postdoctoral Fellowship, the International Postdoctoral Exchange Fellowship Program, the Joint-PhD program founded by China Scholarship Council, and the Quebec's Ministere de l'Education, du Loisir, et du Sport (MELS); MS is supported by a postdoctoral fellowship from MELS; and NS is supported by a European Research Council (ERC) Starting Independent Researcher Fellowship under the grant agreement No. 279587. Furthermore, this work was supported by KAUST through a Competitive Research Grant (CRG-1-2012-THO-015-IMP).en
dc.publisherRoyal Society of Chemistry (RSC)en
dc.titleThe effect of phase morphology on the nature of long-lived charges in semiconductor polymer:fullerene systemsen
dc.typeArticleen
dc.contributor.departmentKAUST Solar Center (KSC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJ. Mater. Chem. Cen
dc.contributor.institutionDepartement de Physique and Regroupement Quebecois sur les Materiaux de Pointe, Université de Montréal, Caisse postale 6128, Succursale centre-villeMontréal, QC, Canadaen
dc.contributor.institutionDepartment of Materials, Imperial College London, South Kensington CampusLondon, United Kingdomen
dc.contributor.institutionInstitute of Information Photonics Technology, College of Applied Sciences, Beijing University of TechnologyBeijing, Chinaen
dc.contributor.institutionDepartment of Chemistry, Imperial College London, South Kensington CampusLondon, United Kingdomen
dc.contributor.institutionDepartment of Physics, Imperial College London, South Kensington CampusLondon, United Kingdomen
kaust.authorDomingo, Esteren
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