Aluminim nitride thin film substrate and process for producing same

摘要

An aluminum nitride film substrate comprising a single crystal diamond having, on its (111) plane, (1) a C-axis oriented aluminum nitride film or (2) an aluminum nitride single crystal film, the C-plane of the aluminum nitride single crystal being parallel to the (111) plane of said single crystal diamond; an aluminum nitride film substrate comprising a substrate having thereon a (111) direction oriented diamond polycrystalline film, and further having thereon a C-axis oriented aluminum nitride film; and a process for producing these aluminum nitride film substrate.