Patent ID: 9023307
Filing Date: 2015-05-05
Classification: C30B

Abstract:
1. In a method of producing single crystal diamond by microwave plasma chemical vapor deposition which comprises providing a substrate with a crystal orientation and establishing a microwave plasma ball in an atmosphere comprising hydrogen and a carbon source at a pressure and temperature sufficient to cause deposition of diamond on said substrate, the improvement wherein the crystal orientation of the substrate is 5-10 degrees off {100}, wherein the nitrogen content in the atmosphere is less than 1 ppm, wherein the growth temperature of the diamond is from about 1250° C. to about 1350 degrees ° C., wherein the Raman/Photoluminescence spectra of the as-made diamond measured at room temperature has no photoluminescence at 575 nm and 637 nm caused by NV 0 and NV − centers, and wherein the growth rate of single crystal diamond is about 200 μm/hr.