An Investigation of Surface Conduction Mechanisms in Semi-Insulating Gallium Arsenide

This is a study of surface and bulk currents between contacts fabricated on semi-insulating (SI) GaAs substrates. This includes a study of bulk and surface electrical conduction behavior. An annulus shaped electrode structure was used. To separate the bulk and surface conductance effects, the samples were exposed to a variety of surface treatments. Current measurements were taken over a range of voltages and the results compared by use of current-voltage plots.