Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 4, Issue 9, Pages 3617-3624Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee01544c
Keywords
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Funding
- Institute of Materials Research and Engineering (IMRE)
- Science, Technology and Research (A*STAR)
- Visiting Investigator Program (VIP)
- Swedish Energy Agency
- Empa
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Diketopyrrolopyrrole (DPP)-based organic semiconductors EH-DPP-TFP and EH-DPP-TFPV with branched ethyl-hexyl solubilizing alkyl chains and end capped with trifluoromethyl phenyl groups were designed and synthesized via Suzuki coupling. These compounds show intense absorptions up to 700 nm, and thin film-forming characteristics that sensitively depend on the solvent and coating conditions. Both materials have been used as electron donors in bulk heterojunction and bilayer organic photovoltaic (OPV) devices with fullerenes as acceptors and their performance has been studied in detail. The best power conversion efficiency of 3.3% under AM1.5G illumination (100 mW cm(-2)) was achieved for bilayer solar cells when EH-DPP-TFPV was used with C-60, after a thermal annealing step to induce dye aggregation and interdiffusion of C-60 with the donor material. To date, this is one of the highest efficiencies reported for simple bilayer OPV devices.
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