TITLE

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

AUTHOR(S)
Worne, J. H.; Anthony, J. E.; Natelson, D.
PUB. DATE
February 2010
SOURCE
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p053308
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
47929023

 

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