Modelling of electrical conductivity of some quasi-one-dimensional organic crystals

Abstract

Organic crystals attract more and more attention as materials with much more diverse and often unusual properties. Among such crystals the quasi-one-dimensional ones present a particular interest due to sophisticated structure determined by the chainlike stacking of molecules. In this paper we propose another interpretation of the temperature dependence of electrical conductivity, based on the crystal model. On consider that the overlap of electronic wave functions along the chains is great, determining a band-like transport mechanism. Between the chains the wave function overlap is small and the transport mechanism in the transversal to chains direction is hopping-like. In the first approximation on neglect the small contribution to electrical conductivity from the hopping carriers motion and obtain a one-dimensional crystal model.