TY - JOUR
T1 - Synthesis and photovoltaic properties of alkoxy-benzimidazole containing low band gap polymers
AU - Shim, Joo Young
AU - Kim, Taehyo
AU - Kim, Juae
AU - Kim, Jinwoo
AU - Park, Dongkyung
AU - Kim, Il
AU - Woo, Hanyoung
AU - Kim, Jin Young
AU - Suh, Hongsuk
N1 - Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2010-0015069 ).
PY - 2015/4/1
Y1 - 2015/4/1
N2 - 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%.
AB - 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%.
KW - DOMBI
KW - OPVs
KW - PTDOMBI
KW - Polymer
KW - Solubility
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U2 - 10.1016/j.tsf.2015.03.005
DO - 10.1016/j.tsf.2015.03.005
M3 - Article
AN - SCOPUS:84926161207
SN - 0040-6090
VL - 580
SP - 29
EP - 35
JO - Thin Solid Films
JF - Thin Solid Films
ER -
