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2012
Journal Article
Title
Room temperature MBE deposition of Bi2Te3 and Sb2Te3 thin films with low charge carrier densities
Abstract
Sb2Te3 and Bi2Te3 thin films were grown at room temperature on SiO2 substrates using MBE and were subsequently annealed at 250°C. The films were stoichiometric, polycrystalline, textured, and yielded strikingly low charge carrier densities of about 2.7 × 10(exp 19) cm-3. The in-plane transport properties were measured at room temperature, the thermopower was 130 µVK(exp -1) for Sb2Te3 and -153 µVK(-1) for Bi2Te3 thin films. The small charge carrier densities are explained by a reduced antisite defect density due to the low temperatures to which the thin films were exposed during annealing.
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