Gap states in organic semiconductors play a crucial role in determining Energy-Level Alignment and in many cases
they act as charge trapping centers to result in serious lowering of charge mobility. Thus origin of gap states has gained
increasing attention in order to realize higher mobility organic devises [1-4]. Bussolotti et al. have demonstrated recently
that gap states in a pentacene thin film increase even by exposing the film to inert gas and confirmed that the gas
exposure mediates structural defects in the film thus gap states [4]. The results have also indicated that preparation of
highly-ordered organic thin film is necessary to improve the device performance, namely to decrease trapping states. To
improve the ordering of molecule in the film, deposition of a template molecular underlayer is one of the simplest
methods to increase the domain size of overlayer film and its crystallinity, and thus we expect improvement of the charge
mobility [5]. Hinderhofer et al. reported recently that diindenoperylene (DIP; Figure 1a) could be used as a template
layer to grow highly ordered and oriented C60 film with its (111) plane parallel to the SiO2 substrate [6]. Considering the
hole mobility of DIP single crystal, which is quite low (~0.005 cm2 V-1S-1 at room temperature [7]), it is expected for the
DIP template C60 thin film system that lower drain current would be achieved to improve the on/off ratios based on n
type C60 transistor and its electron mobility (especially on the negative Vgs region, compared to PEN modified C60
transistors [8]).
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