Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 20, Issue 31, Pages 6517-6523Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm00772b
Keywords
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Funding
- Korea government (MEST) [2010-0015069]
- Information Display RD Center [F0004010-2009-32]
- Ministry of Knowledge Economy of Korean government
- (Global Research Laboratory, GRL) of the Ministry of Education, Science and Technology of Korea [K20607000004]
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A new acceptor unit containing dimethyl-2H-benzimidazole was synthesized and utilized for the synthesis of a conjugated polymer containing electron donor-acceptor pairs for OPV devices. The dimethyl-2H-benzimidazole unit was designed to act as a substitute for the BT unit of PCDTBT. This novel dimethyl-2H-benzimidazole unit has two methyl groups which can supply higher solubility than those of the BT series. A thin film of PCDTMBI, containing the dimethyl-2H-benzimidazole unit, shows two broad absorption bands with maxima at 400 and 636 nm and an absorption onset of 756 nm, corresponding to a band gap of 1.64 eV. The oxidation onset of PCDTMBI was estimated to be 0.67 V, which corresponds to a HOMO energy level of -5.47 eV. The LUMO energy level of the polymer was thus determined to be -3.82 eV. A device with a PCDTMBI:PC(71)BM blend had a V(OC) value of 0.65 V, a J(SC) value of 10.0 mA cm(-2), and a FF of 0.48, leading to an efficiency of 3.12%. The enhanced efficiency of PCDTMBI was caused by the higher IPCE value between 400 and 700 nm and high mobility (2.2 x 10(-3) cm(2) V(-1) s(-1)).
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