Abstract
Charge transport properties of vapor grown C60 single crystals are investigated in the temperature range from 5–300 K by field-effect transistor and space charge limited current measurements in vacuum. Room temperature mobilities of 2.1 and 1.8 cm2/Vs are observed for holes and electrons, respectively. Moreover, the mobilities increase with decreasing temperature following a power law behavior (∝T—1.6). Values as high as 60 (electrons) and 95 cm2/Vs (holes) are achieved at low temperatures. The discontinuity around 255 K is ascribed to the first-order phase transition of C60. The pronounced electric field dependence can be explained by acoustic phonon scattering. Hence, we conclude, that band-like charge transport in delocalized states rather than hopping motion can be assumed as intrinsic charge transport mechanism in undoped C60.
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