MOS heterostructure, semiconductor device with the structure, and method for fabricating the semiconductor device

摘要

An MOS heterostructure includes: a single crystal silicon substrate; an insulating film formed on the substrate; and a conductive film formed on the insulating film. The substrate includes a plurality of terraces and steps, which have been formed as a result of rearrangement of silicon atoms on the surface of the substrate. Each of the step is located in a boundary between an adjacent pair of the terraces. The insulating film contains crystalline silicon dioxide that has grown epitaxially over the steps.