期刊
DYES AND PIGMENTS
卷 133, 期 -, 页码 324-332出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.06.011
关键词
Organic photovoltaic cells; Quinoxaline derivatives; Thieno[3,2-b]thiophene; Conjugated side chain
资金
- National Research Foundation (NRF) grants
- Korean government through GCRC SOP [NRF-2014R1A2A2A01007318, 2011-0030013]
- R&D Convergence Program of NST (National Research Council of Science & Technology) of Republic of Korea [CAP-15-04-KITECH]
A new quinoxaline-based electron-accepting building block with thieno[3,2-b]thiophene side chains was synthesized and copolymerized with the alkoxy-substituted benzodithiophene (BDT) donor building block to obtain poly[(4,8-bis[(2-butyloctyl)oxy]-benzo[1,2-b:4,5-b']dithiophene)-alt-(2,3-bis(5-octylthieno[3,2-b]thiophene-2-yl)-5,8-di(thiophen-2-yl)quinoxaline)] (PBDT- TIDTQx) copolymer. To compare the effect of the addition of the thieno[3,2-b]thiophene side chain in the quinoxaline moiety, an analogous copolymer with a thienyl side chain in the quinoxaline unit was also synthesized to yield the poly[(4,8-bis[(2-butyloctyl)oxy]-benzo[1,2-b:4,5-b']dithiophene)-alt-(2,3-bis(5-octylthiophene-2-yl)-5,8-di(thiophen-2-yl)quinoxaline)] (PBDT-TDTQx) copolymer. The optical, electrochemical, morphological, and photovoltaic properties of the two polymers were investigated. Bulk heterojunction photovoltaic devices were fabricated using the polymers as a p-type donor and [6,6]-phenyl C-71-butyric acid methyl ester (PC71BM) as the n-type acceptor. The power conversion efficiencies of the devices fabricated using PBDT-TTDTQx and PBDT-TDTQx are 3.42 and 2.26%, respectively. The replacement of the alkylthienyl moiety with thieno[3,2-b]thiophene on quinoxaline could expand the UV-visible absorption range due to extended pi-conjugation and also enhance the crystallinity of the polymer. (C) 2016 Elsevier Ltd. All rights reserved.
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