Field-enhanced conductivity in polyacetylene-construction of a field-effect transistor

Abstract

The authors have fabricated field-effect transistors (FET) using 'Durham' route polyacetylene as the active semiconductor. The devices are constructed as MIS structures, with silicon dioxide as the insulator layer between the gate and the polyacetylene. The device behaves as a p-channel enhancement (normally off) FET. For the device geometry presented, the channel conductivity may be modulated by a factor of greater than 2000. The carrier channel mobility and the device transconductance have been determined to be 9*10-6 cm2 V-1 s-1 and 2.5 nS respectively.

Organic Thin Film Transistors for Large Area Electronics

“…In fact, one of the first reported transistors based on organic polymer channels used precursor-route polyacetylene as the semiconducting layer. [113,114] Another polymeric semiconductor that has been processed from a soluble precursor polymer is PTV. [16,30,86,111] …”

Organic Field-Effect Transistors

“…Unfortunately, a great number of CPs are not soluble. The problem may be overcome either by grafting solubilizing groups to the polymer backbone, [19,20] or by the use of a soluble precursor polymer, [21,22] which is then converted to the CP by an appropriate physical or chemical treatment.…”

Interfaces in Organic Field-Effect Transistors

“…[16] This phenomenon occurs through a Poole±Frenkel mechanism, [17] in which the coulombic potential near the localized levels is modified by the applied field in such a way as to increase the tunnel transfer rate between sites. The general dependence of the mobility is given by Equation 21. Here, m(0) is the mobility at zero field, b = (e/pee 0 ) 1/2 the Poole± Frenkel factor, and F the magnitude of the electric field.…”

“…Unfortunately, a great number of CPs are not sol-uble. The problem may be overcome either by grafting solubilizing groups to the polymer backbone, [19,20] or by the use of a soluble precursor polymer, [21,22] which is then converted to the CP by an appropriate physical or chemical treatment.…”