B-N Park et al 2007 J. Phys. D: Appl. Phys. 40 3506 doi:10.1088/0022-3727/40/11/037
B-N Park1, Soonjoo Seo1 and Paul G Evans1,2
Show affiliationsThe geometrical arrangement of single-molecule-high islands and the contact between them have large roles in determining the electrical properties of field effect transistors (FETs) based on monolayer-scale pentacene thin films. As the pentacene coverage increases through the submonolayer regime there is a percolation transition where islands come into contact and a simultaneous rapid onset of current. At coverages just above the percolation threshold, the electrical properties vary with geometrical changes in the contacts between the pentacene islands. At higher coverages, the FET mobility is much lower than the mobility measured by the van der Pauw method because of high contact resistances in monolayer-scale pentacene film devices. An increase in the van der Pauw mobility of holes as a function of pentacene coverage shows that second layer islands take part in charge transport.
Issue 11 (7 June 2007)
Received 8 October 2006, in final form 16 February 2007
Published 18 May 2007
B-N Park et al 2007 J. Phys. D: Appl. Phys. 40 3506
J Miró et al 1997 J. Phys.: Condens. Matter 9 9555
S F J Cox et al 2001 J. Phys.: Condens. Matter 13 2169
C D Latham et al 2008 J. Phys.: Condens. Matter 20 395220
M I Heggie et al 2002 J. Phys.: Condens. Matter 14 12689
A A El-Barbary et al 2006 J. Phys.: Conf. Ser. 26 149
Kazuhiro Yokota et al 2009 New J. Phys. 11 033011
Varghese Mathai et al JHEP11(2003)053
Varghese Mathai and Hisham Sati JHEP03(2004)016
Peter Bouwknegt et al JHEP03(2004)018