HCS – Hall coefficient – Bismuth-Antimony alloy
Inorganics/semiconductors – Hall coefficient – resistivity – mobility
Bismuth-antimony alloys, (Bi1−xSbx) are binary alloys of bismuth and antimony in various ratios. Some, in particular Bi0.9Sb0.1, were the first experimentally-observed three-dimensional topological insulators, materials that have conducting surface states but have an insulating interior. Various BiSb alloys are also used in low temperature thermoelectric devices.
The presented measurement has been conducted on a thermally evaporated Bi87Sb13 thin film. The thermal resistivity (blue curve) is decreasing by temperature which is contrary to a full metal conductor behavior but typical for a semiconductor. The hall coefficient and charge carrier mobility is slightly decreasing over temperature (green and orange curves).