Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 8, Issue 8, Pages 2352-2356Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ee01627d
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Funding
- Center for Advanced Soft Electronics under the Global Frontier Research Program of the Ministry of Education, Science and Technology [NRF-2014M3A6A5060936]
- National Research Foundation (NRF) grants - Korean government [NRF-2014R1A2A2A01007318, 2011-0030013]
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We have synthesized a series of conjugated D-pi-A copolymers, PT-ttTPD and PBT-ttTPD, based on a (5-hexyltridecyl)-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione (ttTPD) acceptor unit in order to develop better photovoltaic polymers based on the TPD moiety: an epsilon-branched alkyl side chain on the TPD unit was coupled with 6-alkyl-thieno[3,2-b]thiophene (tt) pi-bridge molecules. The Stille polymerization of the brominated ttTPD and stannylated simple thiophene (T) finally gave a promising PT-ttTPD polymer showing well-ordered inter-chain orientation in the BHJ active layer. PT-ttTPD-based OPVs exhibited a highest power conversion efficiency (PCE) of 9.21% (V-OC = 0.86 V, J(SC) = 15.30 mA cm(-2), FF = 70%).
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