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Kim, Jin Young
Next Generation Energy Laboratory
Research Interests
  • Polymer solar cells, QD solar cells, organic-inorganic hybrid solar cells, perovskite solar cells, OLEDs, PeLEDs, organic FETs

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Synthesis and photovoltaic properties of alkoxy-benzimidazole containing low band gap polymers

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Title
Synthesis and photovoltaic properties of alkoxy-benzimidazole containing low band gap polymers
Author
Shim, Joo YoungKim, TaehyoKim, JuaeKim, JinwooPark, DongkyungKim, IlWoo, HanyoungKim, Jin YoungSuh, Hongsuk
Issue Date
2015-04
Publisher
ELSEVIER SCIENCE SA
Citation
THIN SOLID FILMS, v.580, pp.29 - 35
Abstract
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-C71-butyric acid methyl ester showed power conversion efficiency of 0.76%.
URI
https://scholarworks.unist.ac.kr/handle/201301/11423
URL
http://www.sciencedirect.com/science/article/pii/S0040609015002102#
DOI
10.1016/j.tsf.2015.03.005
ISSN
0040-6090
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