Effect of Ambient Gases on the Electrical Properties of Thin PbSe Epitaxial Films

摘要

The report investigates the effect of various ambient gases on the electrical properties of PbSe epitaxial films evaporated onto NaCl substrate. Hall coefficient, electrical conductivity, and magnetoresistance measurements were made as a function of film temperature and ambient gas uptake by the film. Ambient gas uptake kinetic measurements were also made. The nature and relative amount of ambients could be determined via a residual gas analyzer. Atomic hydrogen (H) was produced by interacting a hot filament with hydrogen gas, hydrocarbon diffusion pump oil, or alcohol, and was found to make freshly-evaporated films with 'clean' surfaces and air-exposed films n-type. H uptake by the films is inadequately described by the surface model.