Feasibility of static induction transistor with organic semiconductors

We have fabricated and studied static induction transistors (SITs) with various organic semiconductor materials, such as pentacene, perylene, tris(quinoline-8-hydroxylate)aluminum (Alq), and N,N′-di(4-methylphenyl)-N,N′-diphenylbenzidine (TPD), used as the active element. The former two resulted in unsuccessful operation due to a short caused by pinholes formed in the films. Modification of the deposition rates did not change the outcome. The latter two provided successful operation. No fatal pinholes were observed in the thin films of the latter two. It is thus shown that the morphology has crucial effect in the operation of SITs. A transition from linear to nonlinear behavior has been observed in the drain-source I–V characteristics of Alq and TPD.