Galvanomagnetic properties of Bi$_{85}$Sb$_{15}$ thin films on different substrates

The results of studying the galvanomagnetic properties of Bi$_{85}$Sb$_{15}$ thin films on substrates with various thermal-expansion coefficients are presented. The significant effect of the difference between the thermal expansions of film and substrate materials on the galvanomagnetic properties of the films is revealed. An analysis of the film properties within the two-band model shows that the difference in the properties of films on different substrates is associated with changes in the charge-carrier concentration and mobility. It is shown that a decrease in the thermal-expansion coefficient of the substrate material results in a decrease in the carrier concentration in the film composition under study, which indicates a significant difference in changes in the film band structure in comparison with changes occurring with increasing antimony concentration.