TRANSPORT PROPERTIES OF AMORPHOUS FILMS OF TUNGSTIC OXIDE, SUBLIMED UNDER DIFFERENT CONDITIONS

In this paper we describe the sublimation of amorphous tungstic oxide films and the conditions for the preparation of films exhibiting electrochromic behaviour. Compositional analysis by Rutherford backscattering suggests that the films are nearly stoichiometric WO3 but with inclusions of molybdenum and probably also water. In situ measurements of the electrical conductivity and thermoelectric power show that irreversible changes occur at temperatures related to the annealing temperature of the film. Below this transition temperature the conductivity is activated and the thermoelectric power is linearly dependent on temperature; this behaviour suggests carrier motion by hopping in states near the Fermi energy. © 1979.