Fused H-shaped tetrathiafulvalene-oligothiophenes as charge transport materials for OFETs and OPVs
journal contributionposted on 16.06.2017, 12:50 by Iain Wright, Neil J. Findlay, Sasikumar Arumugam, Anto R. Inigo, Alexander L. Kanibolotsky, Pawel Zassowski, Wojciech Domagala, Peter J. Skabara
A series of hybrid tetrathiafulvalene-oligothiophene compounds has been synthesised, where the tetrathiafulvalene unit is fused at each side to an end-capped oligothiophene chain of varying length (terthiophene, quinquithiophene and septithiophene). Each hybrid structure (1-3) has been studied by cyclic voltammetry and triple EPR-UV-Vis-NIR spectroelectrochemistry in the case of the quinquithiophene compound (2). Comparison is made with the corresponding half-units, which lack the fulvalene core and contain just one oligothiophene chain. The highest hole mobility of quinquithiophene-TTF 2 was obtained from field effect transistors (8.61 × 10-3 cm 2 V-1 s-1); its surface morphology was characterised by tapping mode atomic force microscopy and a power conversion of 2.5% was achieved from a bulk heterojunction organic solar cell device using PC71BM as the acceptor. This journal is © the Partner Organisations 2014.
P. J. S. thanks the Royal Society for a Wolfson Research Merit Award and the EPSRC for funding. W. D. & P. Z. acknowledge the support of the Laboratory of Advanced Spectroelectrochemical Studies, established with financial contribution of the Polish National Science Centre grant no. 2011/03/D/ST5/ 06042.