We have grown Bi and BiSb alloy thin films on (211)CdTe substrates by molecular beam epitaxy. Growth proceeds with the Bi or BiSb (00.1) axis oriented along the CdTe direction, which is tilted by 19o with respect to the substrate normal. Measurements of the Seebeck coefficient reveal a strong dependence on angle within the plane, due to the anisotropic electronic structure. The coefficient measured along the [1̄11] axis, which includes a trigonal contribution from the Seebeck tensor, is considerably higher than the value along the [011̄] axis. The magneto-Seebeck coefficient was also studied, for magnetic fields of 0-0.7 T. We observe a strong dependence on both crystal-axis and magnetic field direction, the so-called "umkehr" effect.
ASJC Scopus subject areas
- Physics and Astronomy(all)