Patent ID: 9115443
Filing Date: 2015-08-25
Classification: C01B,C30B,Y10T

Abstract:
1. A method of producing a coloured single crystal diamond layer comprising: selecting a single crystal diamond substrate material which has a low level of intrinsic defects; processing the single crystal diamond substrate material to form a single crystal diamond substrate having a growth surface on which the CVD single crystal diamond material is to be homoepitaxially grown, wherein the growth surface of the single crystal diamond substrate has a density of defects below 5×10 etching the growth surface of the single crystal diamond substrate to remove surface damage introduced during processing of the single crystal diamond substrate material; and providing a source of gas, dissociating the source gas to produce a synthesis atmosphere which contains 300 ppb to 500 ppm nitrogen, calculated as molecular nitrogen, and allowing homoepitaxial diamond growth on the growth surface of the single crystal diamond substrate to produce the single crystal CVD diamond material, wherein the single crystal CVD diamond material is coloured and has a low ramp as set out in the table below: and wherein the single crystal CVD diamond material contains one or more defect and impurity related colour centres that contribute to an absorption spectrum as set out in the absorption coefficient column of the table below: