Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 6, Issue 11, Pages 3301-3307Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ee40689j
Keywords
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Funding
- Ministry of Education, Science and Technology, Korea
- Global Research Laboratory (GRL)
- World Class University (WCU) programs
- US Department of Energy through the Energy Frontier Research Center
- National Research Foundation of Korea [2007-00015] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An effective approach to extend the light absorption range of conjugated polymers for high performance photovoltaics is synthesis of copolymers composed of at least two different chromophores with a complementary absorption range. For this purpose, we synthesized random conjugated copolymers consisting of DPP and isoindigo as co-electron accepting units in donor-acceptor type conjugated copolymers. The random copolymers exhibited both broad light absorption and low-lying HOMO level, which contribute to enhancement of J(SC) and V-OC, respectively. Furthermore, the predominant face-on orientation of the random copolymers on the substrate is beneficial for charge transport in the device. The polymer solar cell (PSC) based on the random copolymer has shown a promising efficiency of 6.04% which is the highest value among PSCs based on random copolymers.
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