  We have obtained a hole mobility for the organic conductor pentacene of 35
cm2/Vs at room temperature increasing to 58 cm2/Vs at 225K. These high
mobilities result from a purification process in which 6,13-pentacenequinone
was removed by vacuum sublimation. The number of traps is reduced by two orders
of magnitude compared with conventional methods. The temperature depandence of
the mobility is consistent with the band model for electronic transport.
