A study of high-quality freestanding diamond films grown by MPCVD

摘要

The fabrication process of high-quality freestanding diamond films grown by Microwave Plasma Chemical Vapor Deposition (MPCVD) was studied. Under the optimal condition, freestanding diamond films 55 mm in diameter with a thickness up to 1 mm were fabricated, showing an excellent crystalline structure as examined from Raman and X-Ray Diffraction (XRD) spectra. For most processing conditions, including substrate temperatures varied from 800 to 1050 ℃, the films were found in a [111] preferential texture, whereas [220] and [001] film textures occurred in some special cases. Optical measurements of one side polished diamond films showed a cutoff wavelength 225 nm, and a transmission ≥70% at λ≥2.5 μm.