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Medium Bandgap Conjugated Polymer for High Performance Polymer Solar Cells Exceeding 9% Power Conversion Efficiency

Jung, J.W.; Liu, F.; Russell, T.P.; Jo, W.H.

Advanced Materials 27(45): 7462-7468

2015


ISSN/ISBN: 1521-4095
PMID: 26449184
DOI: 10.1002/adma.201503902
Accession: 058289207

Two medium-bandgap polymers composed of benzo[1,2-b:4,5-b']dithiohpene and 2,1,3-benzothiadiazole with 6-octyl-thieno[3,2-b]thiophene as a π-bridge unit are synthesized and their photovoltaic properties are analyzed. The two polymers have deep highest occupied molecular orbital energy levels, high crystallinity, optimal bulk-heterojunction morphology, and efficient charge transport, resulting in a power conversion efficiency of as high as 9.44% for a single-junction polymer solar-cell device.

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