Electronic Properties of Liquid Selenium Containing Alkali and Halogen Impurities

Abstract

The electronic properties of liquid Se containing Na, K, Cl, Br and I have been measured. The addition of alkali impurities causes a substantial increase in the electrical conductivity σ and changes the thermoelectric power S from positive to large negative. When halogen impurities are added to liquid Se, σ increases remarkably and S remains positive. No appreciable change in paramagnetic susceptibity is induced by alkali or halogen doping. The alkali doping produces a new optical absorption band near the absorption edge of pure liquid Se, while no appreciable change in the absorption curves can be detected for the halogen doping. It is pointed out that the Fermi level is shifted owing to the charge transfer from the dopant element to Se chains.