Free-standing tetracene single crystal field effect transistor

Abstract We have fabricated and studied field effect transistors (FETs) on the optically transparent free-standing organic single crystals of tetracene. These FETs exhibit effective hole channel mobility μ eff up to 0.15 cm 2 /Vs and on–off ratios up to 2×10 7 . Using measured values of μ eff , thermal activation energy, and a simple model, we deduce an intrinsic free carrier mobility in the range of tens of cm 2 /Vs, similar to that found in pentacene crystals. These values should be considered only as a rough indication of achievable mobilities in samples much purer than those presently studied. The obtained results show the possibility of FET behavior in transparent crystals with low intrinsic carrier density.

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