Parallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additives

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dc.citation.firstpage14804en_US
dc.citation.journalTitleJournal of Materials Chemistry Aen_US
dc.citation.lastpage14813en_US
dc.citation.volumeNumber4en_US
dc.contributor.authorMok, Jorge W.en_US
dc.contributor.authorKipp, Dylanen_US
dc.contributor.authorHasbun, Luis R.en_US
dc.contributor.authorDolocan, Andreien_US
dc.contributor.authorStrzalka, Josephen_US
dc.contributor.authorGanesan, Venkaten_US
dc.contributor.authorVerduzco, Rafaelen_US
dc.date.accessioned2016-09-30T20:52:22Zen_US
dc.date.available2016-09-30T20:52:22Zen_US
dc.date.issued2016en_US
dc.description.abstractIn recent studies, we demonstrated that the addition of block copolymers to binary donorﾖacceptor blends represents an effective approach to target equilibrium, co-continuous morphologies of interpenetrating donors and acceptors. Here, we report a study of the impact of all-conjugated poly(thieno[3,4-b]-thiophene-co-benzodithiophene)-b-polynaphthalene diimide (PTB7-b-PNDI) block copolymer additives on the electronic properties and photovoltaic performance of bulk heterojunction organic photovoltaic active layers comprised of a PTB7 donor and a phenyl-C61-butyric acid methyl ester (PCBM61) acceptor. We find that small amounts of BCP additives lead to improved performance due to a large increase in the device open-circuit voltage (VOC), and the VOC is pinned to this higher value for higher BCP additive loadings. Such results contrast prior studies of ternary blend OPVs where either a continuous change in VOC or a value of VOC pinned to the lowest value is observed. We hypothesize and provide evidence in the form of device and morphology analyses that the impact of VOC is likely due to the formation of a parallel bulk heterojunction made up of isolated PCBM and PNDI acceptor domains separated by intermediate PTB7 donor domains. Altogether, this work demonstrates that all-conjugated block copolymers can be utilized as additives to both dictate morphology and modulate the electronic properties of the active layer.en_US
dc.identifier.citationMok, Jorge W., Kipp, Dylan, Hasbun, Luis R., et al.. "Parallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additives." <i>Journal of Materials Chemistry A,</i> 4, (2016) Royal Society of Chemistry: 14804-14813. http://dx.doi.org/10.1039/C6TA06502Cﾠ.en_US
dc.identifier.doihttp://dx.doi.org/10.1039/C6TA06502Cﾠen_US
dc.identifier.urihttps://hdl.handle.net/1911/91628en_US
dc.language.isoengen_US
dc.publisherRoyal Society of Chemistryen_US
dc.rightsThis article is licensed under a Creative Commons Attribution 3.0 Unported Licence.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/en_US
dc.titleParallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additivesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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