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Synthesis and Characterization of Trifluoromethylated Benzimidazole and Benzo[1,2-B:3,4-B']Dithiophene Based Donor-Acceptor Conjugated Polymer for Polymer Solar Cells

Published online by Cambridge University Press:  19 August 2014

M.G Murali ,
Arun D. Rao  and
Praveen C. Ramamurthy
M.G Murali
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore- 560012, India.
Arun D. Rao
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore- 560012, India.
Praveen C. Ramamurthy
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore- 560012, India. Center for Nanoscience and Engineering, Indian Institute of Science, Bangalore- 560012, India
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Abstract

A new donor-acceptor structured conjugated polymer (PDODTBI) with trifluoromethylated benzimidazole and benzo[1,2-b;3,4-b']dithiophene (BDT) unit have been designed and synthesized using Stille coupling polymerization reaction. The polymer is highly soluble in common organic solvents such as chloroform, tetrahydrofuran and chlorobenzene with good film forming properties. The structure of the polymer is elucidated by 1H NMR and FTIR spectroscopic techniques. The introduction of a trifluoromethyl group at 4th position of the benzimidazole unit has significantly altered the optical and electrochemical properties of polymer. Polymer film showed broad absorption band in the range of 400-680 nm. Optical band gap of the polymer estimated from the absorption band edge and is found to be ∼1.88 eV. Polymer exhibited deeper HOMO (-5.0 eV) and the LUMO (-3.12 eV) energy levels. Bulk heterojunction (BHJ) solar cell device with PDODTBI as a donor and PC61BM as an acceptor were evaluated.

Keywords

photovoltaicpolymeroptoelectronic
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1668: Symposium C – Synthesis and Processing of Organic and Polymeric Materials for Semiconductor Applications , 2014 , mrss14-1668-c06-18
Copyright
Copyright © Materials Research Society 2014 

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References

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