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dc.contributor.authorJiang, Jian-Mingen_US
dc.contributor.authorRaghunath, Putikamen_US
dc.contributor.authorLin, Yu-Cheen_US
dc.contributor.authorLin, Hsi-Kueien_US
dc.contributor.authorKo, Chen-Linen_US
dc.contributor.authorSu, Yu-Weien_US
dc.contributor.authorLin, M. C.en_US
dc.contributor.authorWei, Kung-Hwaen_US
dc.date.accessioned2016-03-28T00:04:10Z-
dc.date.available2016-03-28T00:04:10Z-
dc.date.issued2015-11-19en_US
dc.identifier.issn0032-3861en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.polymer.2015.10.033en_US
dc.identifier.urihttp://hdl.handle.net/11536/129376-
dc.description.abstractIn this study we synthesized medium-band gap, two-dimensional (2-D) conjugated polymers comprising electron-rich benzo[1,2-b:4,5-b\'] dithiophene (BDT) units presenting conjugated thiophene (T) side chains and electron-deficient alkoxy-modified 2,1,3-benzooxadiazole (BO) moieties. We introduced various solubilizing substituents-linear alkyl, alkoxy, and alkythio units-on the thiophene side chains to obtain a series of 2-D conjugated D-pi-A polymers: PBDTT-C-BO, PBDTT-O-BO, and PBDTT-S-BO. The solubilizing substituents of the BDT units altered the solubility, conformations, and electronic properties of the synthesized conjugated polymers, allowing tuning of the photovoltaic properties when blended with fullerenes. We investigated the effects of the different linear solubilizing substituents of the BDT units on the structural, optical, and electronic properties (e.g., band gap energies) of the resulting 2-D conjugated polymers, as determined from quantum-chemical calculations, UV-Vis absorption spectra, and grazing-incidence X-ray diffraction. Atomic force microscopy and transmission electron microscopy images revealed the morphologies of active layers comprising these 2-D conjugated polymers and the fullerene derivative [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM). Through rational structural modifications of the solubilizing substituents in the 2-D conjugated polymers with alkoxy, alkythio or alkyl units, the resulting PCEs varied from 5.4 to 7.5%. A polymer solar cell based on a blend of PBDTT-C-BO and PC71BM exhibited the best photovoltaic performance among our three studied systems, with a high short-circuit current density (J(sc)) of 15.7 mA cm(-2) and a power conversion efficiency of 7.5%, without the need for any processing additives or post-treatment processes, highlighting the importance of careful selection of appropriate solubilizing substituent that attached to the donor segments when designing efficient D-pi-A polymers for use in solar cells. (C) 2015 Elsevier Ltd. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectPhotovoltaicsen_US
dc.subjectTwo-dimensional conjugated polymersen_US
dc.subjectSide chain structureen_US
dc.subjectSolubilizing substituenten_US
dc.titleLinear solubilizing side chain substituents enhance the photovoltaic properties of two-dimensional conjugated benzodithiophene-based polymersen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.polymer.2015.10.033en_US
dc.identifier.journalPOLYMERen_US
dc.citation.volume79en_US
dc.citation.spage262en_US
dc.citation.epage270en_US
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.department應用化學系zh_TW
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
dc.contributor.departmentDepartment of Applied Chemistryen_US
dc.identifier.wosnumberWOS:000365042500029en_US
dc.citation.woscount0en_US
Appears in Collections:Articles