期刊
THIN SOLID FILMS
卷 580, 期 -, 页码 29-35出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2015.03.005
关键词
Polymer; OPVs; DOMBI; PTDOMBI; Solubility
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MEST) [2010-0015069]
Dioctyloxy substituted dimethyl-2H-benzimidazole (4,7-dibromo-5,6-dioctyloxy-2,2-dimethyl-2H-indene, DOMBI) was prepared and copolymerized with thiophene (or bithiophene) and carbazole using both Stille and Suzuki polymerization. In DOMBI, the sulfur at 2-position of 2,1,3-benzothiadiazole (BT) unit was replaced with dialkyl substituted carbon and dioctyloxy groups were introduced at 5,6-position of dimethyl-2H-benzimidazole (MBI) unit. DOMBI unit is still keeping 1,2-quinoid form with two alkyl groups on the carbon which substitute the sulfur of BT. In addition to this, dioctyloxy groups on 5,6-position will improve the absorption at the longer wavelength region. The poly(2,2-dimethyl-5,6-bis(octyloxy)-4-(2-thienyl)-2H-bezimidazole) (PTDOMBI) thin films show absorption band with peaks at 357 and 656 nm and an absorption onset at 775 nm, corresponding to a band gap of 1.60 eV. The devices with PTDOMBI with [6,6]phenyl-C-71-butyric acid methyl ester showed power conversion efficiency of 0.76%. (C) 2015 Elsevier B.V. All rights reserved.
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