Abstract:
PROBLEM TO BE SOLVED: To provide an epitaxial diamond film underlaying substrate and its manufacturing method in which a diamond of high quality having a large area of ≥1 inch (2.5 cm) in diameter on an iridium substrate can be subjected to the epitaxial growth by using the CVD method, and an epitaxial diamond film manufactured by the epitaxial diamond film underlaying substrate and its manufacturing method. SOLUTION: An iridium (Ir) film is deposited by the epitaxial growth by the vacuum vapor deposition method or the sputtering method on a substrate of a single crystal magnesium oxide (MgO) or a single crystal sapphire (α-Al 2 O 3 ). The bias nucleus generation of forming an epitaxial diamond nucleus is performed by exposing DC plasma containing ions to a surface of the film-deposited iridium (Ir) substrate. COPYRIGHT: (C)2008,JPO&INPIT