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dc.contributor.authorChiou, De-Yangen_US
dc.contributor.authorCao, Fong-Yien_US
dc.contributor.authorHsu, Jhih-Yangen_US
dc.contributor.authorTsai, Che-Enen_US
dc.contributor.authorLai, Yu-Yingen_US
dc.contributor.authorJeng, U-Seren_US
dc.contributor.authorZhang, Jianquanen_US
dc.contributor.authorYan, Heen_US
dc.contributor.authorSu, Chun-Jenen_US
dc.contributor.authorCheng, Yen-Juen_US
dc.date.accessioned2018-08-21T05:53:56Z-
dc.date.available2018-08-21T05:53:56Z-
dc.date.issued2017-04-21en_US
dc.identifier.issn1759-9954en_US
dc.identifier.urihttp://dx.doi.org/10.1039/c7py00194ken_US
dc.identifier.urihttp://hdl.handle.net/11536/145360-
dc.description.abstractA systematic methodology is developed to construct the angular-shaped beta-form naphthodithiophene (beta-aNDT) core with regiospecific substitution of two alkyl groups at its 4,9-or 5,10-positions via the base-induced double 6 pi-cyclization of dithienyldieneyne precursors, leading to the two isomeric 4,9-beta-aNDT and 5,10-beta-aNDT monomers. It is found that a more curved geometry of the beta-aNDT units intrinsically increases the solubility and thus the solution-processability of the resultant polymers. Therefore, beta-aNDT units are ideal for polymerization with an acceptor-containing monomer without the need for any solubilizing aliphatic side chains, which are considered the insulating portion that jeopardizes charge transport. Based on this consideration, the 4,9- and 5,10-dialkylated beta-aNDT monomers are polymerized with the non-alkylated DTFBT acceptor to afford two P4,9-beta NDTDTFBT and P5,10-beta NDTDTFBT copolymers for head-to-head comparison of the 4,9-inner/5,10-outer isomeric alkylation effect. It is found that 4,9-beta aNDT adopts a twisted conjugated structure due to the intramolecular steric repulsion between the inner branched side chains and the beta-hydrogens on the thiophene rings. The slightly twisted 4,9-beta-aNDT moiety allows P4,9-beta NDTDTFBT to have higher solubility upon polymerization and thus a higher molecular weight, which eventually induces a higher ordered packing structure in the thin film compared to P5,10-beta NDTDTFBT. As a result, P4,9-beta NDTDTFBT exhibits a higher OFET mobility of 0.18 cm(2) V-1 s(-1), and the P4,9-beta NDTDTFBT: PC71BM-based solar cell device also achieves a higher PCE of 7.23%, which is even better than the corresponding P4,9-alpha NDTDTFBT-based device.en_US
dc.language.isoen_USen_US
dc.titleSynthesis and side-chain isomeric effect of 4,9-/5,10-dialkylated-beta-angular-shaped naphthodithiophenes-based donor-acceptor copolymers for polymer solar cells and field-effect transistorsen_US
dc.typeArticleen_US
dc.identifier.doi10.1039/c7py00194ken_US
dc.identifier.journalPOLYMER CHEMISTRYen_US
dc.citation.volume8en_US
dc.citation.spage2334en_US
dc.citation.epage2345en_US
dc.contributor.department應用化學系zh_TW
dc.contributor.departmentDepartment of Applied Chemistryen_US
dc.identifier.wosnumberWOS:000399205900007en_US
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