標題: Synthesis, characterization, and photovoltaic applications of donor-acceptor alternating and random copolymers based on a ladder-type nonacyclic structure
作者: Liang, Wei-Wei
Lin, Yu-Shun
Lai, Yu-Ying
Cheng, Yen-Ju
應用化學系
Department of Applied Chemistry
關鍵字: Donor-acceptor conjugated copolymer;Random copolymer;Alternating copolymer;Polymer solar cell;ONIOM calculations
公開日期: Nov-2016
摘要: A nonacylic building block TPTPT with the alternate thiophene and benzene subunits fastened by four bridging methylene groups was connected with various acceptors including diphenylquinoxaline (QX), thieno[3,4-c]pyrrole-4,6(5H)-dione (TPD), thieno[3,44]thiophene (TT) to afford donor-acceptor (D-A) alternating copolymers - PTPTPTQX, PTPTPTTPD, and PTPTPTTT and random copolymers - PTPTPTQX11,PTPTPTQX12, PTPTPTTPD11, PTPTPTTPD12, PTPTPTTT11, and PTPTPTTT12. The thermal, optical, and electrochemical properties of these copolymers were measured and compared. The random copolymers all have higher glass transition temperature (T-g) than the corresponding alternating copolymers. ONIOM (our own n-layered integrated molecular orbital and molecular mechanics) calculations suggest that the increase of planarity in the random copolymers arises from the introduction of thiophene units intercalating between donor and acceptor moieties. Bulk heterojunction (BHJ) polymer solar cells (PSCs) were fabricated on the basis of ITO/PEDOT:PSS/polymer:PC71BM/Ca/Al device configuration. When the acceptor is QX or TPD, the resultant alternating copolymers performed superior than the random counterparts. When the acceptor is TT, the high content of TT seems to be harmful to the device efficiency, which may relate with the strong quinoidal character of the TT unit. Overall, for the win core structure, in the used acceptors, the alternating-copolymer arrangement appears to be a better construction manner for the purpose of BHJ PSC applications. (C) 2016 Published by Elsevier B.V.
URI: http://dx.doi.org/10.1016/j.reactfunctpolym.2016.04.002
http://hdl.handle.net/11536/132853
ISSN: 1381-5148
DOI: 10.1016/j.reactfunctpolym.2016.04.002
期刊: REACTIVE & FUNCTIONAL POLYMERS
Volume: 108
起始頁: 113
結束頁: 121
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