Researchers from Georgia Institute of Technology and University of Washington have synthesised dithienopyrrole–quinoxaline/pyridopyrazine donor–acceptor polymers by Stille coupling reactions.
It was found that the pyridopyrazine moiety is a stronger acceptor than quinoxaline and that the extended benzophenazine and dibenzopyridoquinoxaline species are stronger acceptors than quinoxaline and pyridopyrazine, respectively. When used in field effect transistors, average hole mobilities of up to ca 3.0 × 10–4 cm2 V–1 s–1 were obtained. Bulk heterojunction photovoltaic devices made from blends of the benzo[a,c]phenazine-based polymer gave average power conversion efficiencies of 1.4%.
Interested to know more? Why not read the full article for free: X. Zhang, J. W. Shim, S. P. Tiwari, Q. Zhang, J. E. Norton, P.-T. Wu, S. Barlow, S. A. Jenekhe, B. Kippelen, J.-L. Brédas and S. R. Marder, J. Mater. Chem., 2011, DOI: 10.1039/c0jm04290k (Advance Article)
