Time of flight of carriers in simple aromatic hydro-carbon layers I: Theory

Abstract

It has been found that the drift velocity of carriers in polycrystalline layers of simple aromatic hydrocarbons increases proportionally to the electric field and saturates at a field of 2×10 6 V m −>1. In addition it has been inferred that the predominant conduction mechanism in polycrystalline simple aromatic hydro-carbon layers is a hopping process between localized states within the “impurity” band at the Fermi level. A simple model to explain the phenomenon was put forward earlier. In this paper the problem is discussed more exactly, using the assumption that so-called “difficult” jumps of carriers play a significant role in the transport of carriers in polycrystalline simple aromatic hydrocarbon layers.