Publication date: 23rd October 2020
Star-shaped donor-π-acceptor oligomers based on electron-donating triphenylamine are promising semiconductor materials for organic electronics and photovoltaics [1-5]. Variation of the length of conjugated π-spacer between the electron donor and electron withdrawing blocks allows to adjust the physicochemical properties of materials, for example, values of highest occupied molecular orbital (HOMO), bandgap (Eg), absorption and luminescence spectra, phase behavior. Star-shaped molecules based TPA with quatrotiophene spacers hadn’t been described becouse their synthesis is complicated because of the low solubility of such systems. In this work the first star-shaped donor-acceptor triphenylamine-based molecule 4T with quatrothiophene conjugated π-spacers and hexyldicyanovinyl electron-withdrawing groups and novel analogues 0T and 1T with different length of π-conjugated oligothiophene spacers were synthesized and their physicochemical and photovoltaic properties were studied and compared to those of molecule 2T and 3T. An influence of the length of π-conjugated oligothiophene spacers from 0 to 4 thiophene units were used to study the structure – properties – device performance relationships for these novel molecules.
This work was supported by Russian Science Foundation (№19-73-30028).
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