Journal
DYES AND PIGMENTS
Volume 122, Issue -, Pages 213-223Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2015.06.026
Keywords
Donor-acceptor oligorners; Oligothiophenes; Organic solar cells; Alkyldicyanovinyl groups; Dithienosilole; Effect of heteroatom substitution
Funding
- Russian Foundation for Basic Research [15-33-20957]
- Cluster of Excellence Engineering of Advanced Materials at the University of Erlangen-Nuremberg
- German Research Foundation (DFG) within the framework of its Excellence Initiative
- Russian Federation [MK-5061.2015.3]
- DFG [1355]
- China Scholarship Council (CSC)
- Solar Technologies go Hybrid (SolTech)
- Sonderforschungsbereich 953 Synthetic Carbon Allotropes
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Synthesis of novel acceptor-donor-acceptor oligomers with electron-withdrawing alkyldicyanovinyl groups linked through an oligothiophene pi-bridge with either dithienosilole or cyclopentadithiophene electron donor units is described. Changing the bridgehead atom from carbon to silicon in the central donor unit leads to a significant change in optical, thermal and structural properties of the oligomers. In addition, elongation of the oligothiophene pi-bridge in the oligomers increases energies of HOMO and LUMO levels and leads to an unexpected hypsochromic shift of their absorption spectrum, because extension of the conjugation length cannot compensate a decrease of the intramolecular charge transfer between the dithienosilole and dicyanovinyl units. Although these minor changes in the chemical structures have a pronounced impact on the morphologies of their blends with PC70BM, the optimized solution-processed organic solar cells based on these small molecules demonstrate similar power conversion efficiencies. (C) 2015 Elsevier Ltd. All rights reserved.
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