High-Performance Single Crystal Organic Field-Effect Transistors Based on Two Dithiophene-Tetrathiafulvalene (DT-TTF) Polymorphs (pages 4198–4203)
Raphael Pfattner, Marta Mas-Torrent, Ivano Bilotti, Aldo Brillante, Silvia Milita, Fabiola Liscio, Fabio Biscarini, Tomasz Marszalek, Jacek Ulanski, Andrzej Nosal, Maciej Gazicki-Lipman, Michael Leufgen, Georg Schmidt, Laurens W. Molenkamp, Vladimir Laukhin, Jaume Veciana and Concepció Rovira
Article first published online: 18 JUN 2010 | DOI: 10.1002/adma.201001446
Solution prepared single crystal organic field-effect transistors (OFETs) combine low-cost with high performance due to structural ordering of molecules. However, in organic crystals polymorphism is a known phenomenon, which can have a crucial influence on charge transport. Here, the performance of solution-prepared single crystal OFETs based on two different polymorphs of dithiophene-tetrathiafulvalene, which were investigated by confocal Raman spectroscopy and X-ray diffraction, are reported. OFET devices prepared using different configurations show that both polymorphs exhibited excellent device performance, although the α-phase revealed charge carrier mobility between two and ten times higher in accordance to the closer stacking of the molecules.