Authors

Abstract

Bi foils with 9-40 µm thicknesses were obtained by a melt spinning method. The microstructure and resistivity in Bi foils at cryothermal treatment have been studied. The foil samples were characterized using XRD to identify the plane orientations and SEM to observe the morphology. The resistivity of Bi foils was measured by two-point probe method at temperatures of 77-300 K using a laboratory cryostat. The formation of Bi polycrystalline foils with a specific orientation allowed us to discover SMSC (Semimetal-Semiconductor Transition) in Bi foils with a 9 µm and 11 µm thicknesses at temperatures of 180-220 K. It was observed that cryogenic cycling increases the resistivity in Bi foils by a factor of 6-19. The experimental results showed that cryothermal treatment provided exfoliation of Bi bilayers with appearance charge carriers and surface conductivity in Bi foils that can be used for real applications in microelectronic components.

Keywords