Journal article

Effect of molecular weight on the properties and organic solar cell device performance of a donor-acceptor conjugated polymer

Zeyun Xiao, Kuan Sun, Jegadesan Subbiah, Tianshi Qin, Shirong Lu, Balaji Purushothaman, David J Jones, Andrew B Holmes, Wallace WH Wong



Donor-acceptor conjugated polymers with 2-(2-ethylhexyl)-3-hexyl thienyl substituted benzo[1,2-b:4,5-b′]dithiophene (BDT) as donor building block and 5,6-difluorobenzo[c][1,2,5]thiadiazole as acceptor building block have been synthesized by Stille coupling polymerization. The polymerization conditions were optimized to achieve high molecular weight polymers (number-average molecular weight, Mn, up to 139 kg mol-1). The molecular weight dependent polymer properties were studied and compared. Photovoltaic applications of the polymers in bulk heterojunction (BHJ) solar cells revealed that the power conversion efficiency increased significantly (from 0.9% to 4.1%) as the Mn increased from 10 kg ..

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Awarded by Australian Renewable Energy Agency (ARENA)

Awarded by Australian Research Council

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 Australian Centre for Advanced Photovoltaics) 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).