Thermochromic and photovoltaic properties of an alternating copolymer of dithieno[3,2-b:2′,3′-d]thiophene and thieno[3,4-c]pyrrole-4,6-dione

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DOIResolve DOI: http://doi.org/10.1002/macp.201200468
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TypeArticle
Journal titleMacromolecular Chemistry and Physics
ISSN1022-1352
Volume214
Issue4
Pages447452; # of pages: 6
SubjectAlternating copolymer; Building blockes; Bulk heterojunction; Chlorobenzene solution; Electron-deficient; Electron-donating; Electron-rich; Electronwithdrawing; General designs; Main chains; Organic solar cell; Peak shift; Photovoltaic applications; Photovoltaic property; Polymer main chain; Polymer materials; Polymer photovoltaics; Polymer Solar Cells; Power conversion efficiencies; Steric effect; Steric hindrances; Thermo-chromic; Thermochromic effects; Chemical reactions; Conjugated polymers; Conversion efficiency; Electrons; Fluorescence spectroscopy; Heterojunctions; Solar cells; Thiophene; Polymer blends
AbstractThe synthesis of a new alternating conjugated polymer, PDTTTPD, based on electron-donating dithieno[3,2-b:2′,3′-d]thiophene (DTT) and electron-withdrawing thieno[3,4-c]pyrrole-4,6-dione (TPD) units is reported. This polymer shows strong thermochromic effect in chlorobenzene with a peak shift up to 170 nm. This phenomenon is studied with fluorescence spectroscopy and related to the steric hindrance along the polymer main chain. Polymer solar cells are fabricated from its blends with PC71BM, and shows modest power conversion efficiency up to 2.1%. The low efficiency is due to the low short-circuit current, which is also attributed to the steric effect. Based on these results, a general design rule for polymer photovoltaic material with controlled backbone conformation is proposed. A new alternating conjugated polymer, PDTTTPD, based on electron-rich dithieno[3,2-b:2′,3′-d] thiophene (DTT) and electron-deficient thieno[3,4-c]pyrrole-4,6-dione (TPD) building blocks is designed and synthesized. PDTTTPD shows strong thermochromic effect in chlorobenzene solution and modest PCE of 2.1% in organic solar cell devices due to the steric hindrance induced twisting of the conjugated main chain. A general design rule is then suggested to control the main chain conformation of polymer materials for photovoltaic applications. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE); NRC Institute for Microstructural Sciences (IMS-ISM)
Peer reviewedYes
NPARC number21269871
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Record identifier274551de-d1fe-4570-b5da-ab12e0bae829
Record created2013-12-13
Record modified2016-05-09
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