Zur elektrischen Leitf�higkeit aufgedampfter Bleiselenidschichten

Abstract

Measurements are described, which show the variation of conductance versus temperature of evaporated layers of leadselenide in presence of low partial pressures of selenium. The interaction between the selenium vapor and the leadselenide film is revealed by the reversible dependence of conductance on temperature and partial pressure of selenium. The measured relationships are quantitatively understood on the following assumptions: The reactions of lead resp. selenium vacancies with selenium particles, adsorbed from the vapor phase, are limited to the surface region of the PbSe crystallites. The interior of the crystallites remains unchanged.