Abstract
Physical and chemical vapor deposition approaches of growing thick
cubic boron nitride (cBN) films needed for practical applications
are reviewed. The interfacial soft hexagonal/amorphous boron nitride
(hBN/aBN) layers and large stress associated with cBN deposition
are suppressed through: (1) reduction of ion energy, (2) deposition
at elevated temperatures, (3) post-deposition treatment, (4) use
of buffer layers and (5) introduction of halogen chemistry. The most
striking recent application of fluorine chemistry on diamond interlayers
in our laboratory yielded thick, epitaxial cBN films with well-resolved
Raman cBN spectra. This opens the road for growing adherent and thick
large area poly- and single crystalline cBN with no soft interlayer
and the quality sufficient for mechanical and electronic applications.
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