Charge induced energy fluctuations in thin organic films: effect on charge transport

Abstract

Effect of static charges on charge carrier transport in disordered organic materials is considered. Long range nature of Coulomb interaction requires to take into consideration a finite thickness of the transport layer. Presence of conducting electrodes significantly modifies properties of organic medium, removes a long range Coulomb divergence, and makes it possible to calculate in finite form statistical properties of organic medium (with nonzero total charge density), relevant for transport characteristics. A special attention is paid to the particular case of charge induced disorder - a disorder originated from the surface charge located at the rough surface of electrode. We present also a generalization of 1D model of charge carrier transport to the case of inhomogeneous energetic disorder that realizes in for charge induced disorder.