Abstract
We have investigated the influence of carrier injection on the characteristics of an organic field effect transistor (OFET) using a rubrene single crystal. The mobility estimated from the transfer characteristic of the OFET depended strongly on the channel length and the thickness of the rubrene single crystal although the mobility is intrinsically independent of the dimensions of an OFET. On the other hand, the temperature dependence of the saturation drain current was in good agreement with the thermal-field emission theory. These suggest that OFETs are controlled not only by the carrier accumulation at the channel but also by the carrier injection.
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