S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
Synthesis of a low bandgap polymer based on a thiadiazolo-indolo[3,2-b]carbazole derivative for enhancement of open circuit voltage of polymer solar cells
- Park, Ha Jin; Lee, Yoonkyoo; Jo, Jea Woong; Jo, Won Ho
- Issue Date
- ROYAL SOC CHEMISTRY
- POLYMER CHEMISTRY Vol.10 No.3, pp. 2928-2932
- For the purpose of synthesizing an electron donor polymer with a low-lying highest occupied molecular orbital (HOMO) energy level and thus to achieve high open circuit voltage (VOC) of polymer solar cells, an indolocarbazole derivative, 3,8-bis-(4-octyl-thiophene-2-yl)-5,6-didodecyl-thiadiazolo-indolo[3,2-b]carbazole, was synthesized and used as a building block of a low bandgap alternating copolymer. An alternating copolymer, poly(3,8-bis-(4-octyl-thiophene-2-yl)-5,6-didodecyl-thiadiazolo-indolo[3,2-b]carbazole-alt-2,1,3-benzothiadiazole) (PTICThBT), was synthesized via the Suzuki coupling reaction, and the copolymer exhibited a deep HOMO level of ?5.4 eV. When a blend of PTICThBT and PC71BM was used as an active layer in bulk heterojunction polymer solar cells, a high VOC of 0.84 V was obtained with a power conversion efficiency of 2.62% under AM 1.5G condition.
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