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dc.contributor.authorCheng, Yen-Juen_US
dc.contributor.authorWu, Jhong-Sianen_US
dc.contributor.authorShih, Ping-Ien_US
dc.contributor.authorChang, Chih-Yuen_US
dc.contributor.authorJwo, Pei-Chien_US
dc.contributor.authorKao, Wei-Shunen_US
dc.contributor.authorHsu, Chain-Shuen_US
dc.date.accessioned2014-12-08T15:11:34Z-
dc.date.available2014-12-08T15:11:34Z-
dc.date.issued2011-05-10en_US
dc.identifier.issn0897-4756en_US
dc.identifier.urihttp://dx.doi.org/10.1021/cm200041ven_US
dc.identifier.urihttp://hdl.handle.net/11536/8871-
dc.description.abstractBy utilizing Friedel-Crafts cyclization, we have successfully designed and synthesized a ladder-type heptacyclic carbazole-dicyclopentathiophene (CDCT-C8) unit in which two outer thiophene subunits are covalently fastened to the central 2,7-carbazole core. The nitrogen-directing effect of the carbazole unit facilitates the intrarnolecular cydization and thereby suppresses the acid-induced dehydration, allowing us to incorporate two octyl side chains on the cyclopentadiene rings in good chemical yield. The distannyl-CDCT-C8 building block was copolymerized with benzothiadiazole (BT), dithienylbenzothiadiazole (DTBT), dithienyldiketopyrrolopyrrole (DTDPP) and quinoxaline (QX) units by Stile polymerization to afford four alternating donor acceptor copolymers, PCDCTBT-C8, PCDCTDTBT-C8, PCDCTDTDPP-C8 and PCDCTQX-C8, respectively. The device based on the PCDCTBT-C8:PG7IBM (1:3 in wt%) blend exhibited a V(oc) of 0.74 V, a J(sc) of 10.3 mA/cm(2), a FF of 60%, delivering an impressive PCE of 4.6%. This value represents one of the best performances among carbazole-based conjugated polymers in the literatures. The corresponding PCDCTBT-C8 :PC(71)BM blend showed a high hole mobility of 1.2 x 10(-3) cm(2) V(-1) s(-1), which is in good agreement with its high current density and fill factor. This improved performance is associated with the modification of the aliphatic side chains on the CDCT structure to optimize the interchain interactions for enhanced charge transporting. The devices based on PCDCTDTBT-C8, PCDCTDTDPP-C8 and PCDCTQX-C8 polymers also displayed promising efficiencies of 3.5%, 2.4%, and 1.8%, respectively.en_US
dc.language.isoen_USen_US
dc.subjectFriedel-Crafts cyclizationen_US
dc.subjectcarbazoleen_US
dc.subjectladder-typeen_US
dc.subjectpolymerizationen_US
dc.subjectorganic photovoltaicsen_US
dc.titleCarbazole-Based Ladder-Type Heptacylic Arene with Aliphatic Side Chains Leading to Enhanced Efficiency of Organic Photovoltaicsen_US
dc.typeArticleen_US
dc.identifier.doi10.1021/cm200041ven_US
dc.identifier.journalCHEMISTRY OF MATERIALSen_US
dc.citation.volume23en_US
dc.citation.issue9en_US
dc.citation.spage2361en_US
dc.citation.epage2369en_US
dc.contributor.department應用化學系zh_TW
dc.contributor.departmentDepartment of Applied Chemistryen_US
dc.identifier.wosnumberWOS:000290063600012-
dc.citation.woscount61-
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