Transport in organic semiconductors in large electric fields: From thermal activation to field emission

Worne, J. H.; Anthony, J. E.; Natelson, D.
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p053308
Academic Journal
Understanding charge transport in organic semiconductors in large electric fields is relevant to many applications. We present transport measurements in organic field-effect transistors based on poly(3-hexylthiophene) and 6,13-bis(triisopropyl-silylethynyl) (TIPS) pentacene with short channels, from room temperature down to 4.2 K. Near 300 K transport in both systems is well described by thermally assisted hopping with Poole–Frenkel-type enhancement of the mobility. At low temperatures and large gate voltages, transport in both materials becomes nearly temperature independent, crossing over into field-driven tunneling. These data, particularly in TIPS-pentacene, show that great caution must be exercised when considering more exotic (e.g., Tomonaga–Luttinger liquid) interpretations of transport.


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