Solid-Phase Reactions and Phase Transformations in a Nanoscale Bismuth/Selenium Film Structure

Experimental results of a study concerned with solid-phase reactions and phase transformations in a Bi/Se nanoscale film structure under heat treatment in vacuum are presented. Nanocrystalline Bi2Se3, BiSe, and Bi 4 Se 3 films are obtained for the first time by solid-phase synthesis at various ratios between the Bi and Se layer thicknesses. The phase-transformation temperatures at which Se, BiSe, and Bi4Se3 crystalline phases are formed are determined. The average crystallite sizes in the Bi 2 Se 3 , BiSe, and Bi 4 Se 3 films are found to be 21, 23, and 33 nm, respectively.