Journal article

Synthesis and photovoltaic properties of thieno[3,2-b]thiophenyl substituted benzo[1,2-b:4,5-b ']dithiophene copolymers

Z Xiao, J Subbiah, K Sun, DJ Jones, AB Holmes, WWH Wong

Polym. Chem. | ROYAL SOC CHEMISTRY | Published : 2014

Abstract

A new benzo[1,2-b:4,5-b']dithiophene (BDT) building block with 4,8-disubstitution using 2-(2-ethylhexyl)-3-hexylthieno[3,2-b]thiophene as the substituent has been designed and synthesized. The new building block has been copolymerized with benzothiadiazole (BT) and 5,6-difluorobenzothiadiazole (fBT) by Suzuki and Stille coupling polymerization to synthesize donor-acceptor conjugated polymers. The optical and electrochemical properties of the synthesized copolymers were studied. Bulk heterojunction solar cells were fabricated using the donor-acceptor copolymers in conjunction with PC71BM and exhibited up to 4.20% power conversion efficiency.

Grants

Awarded by Victorian State Government Department of Primary Industries (Energy Technology Innovation Strategy), Australian Renewable Energy Agency(ARENA)


Awarded by Australian Research Council Future Fellowship


Funding Acknowledgements

This work was made possible by support of the Victorian Organic Solar Cell Consortium, with funding provided by the Victorian State Government Department of Primary Industries (Energy Technology Innovation Strategy), Australian Renewable Energy Agency (ARENA Project 2-A018) and the Victorian State Government Department of Business Innovation (Victorian Science Agenda). Dr W. W. H. Wong is supported by an Australian Research Council Future Fellowship (FT130100500). The authors thank Dr Tianshi Qin (CSIRO) for acquiring the HT-GPC data.