High mobility n-type charge carriers in large single crystals of anatase (TiO2)

Abstract

Resistivity, thermopower, and Hall‐effect measurements on large single crystals of the anatase form of TiO₂ all indicate high mobility n‐type carriers that are produced by thermal excitation from a density of ∼10¹⁸ cm⁻³ putatively present shallow donor states. The decrease of the mobility with increasing temperature is consistent with the scattering of carriers by the optical phonons of TiO₂.