	US 12,234,570 B2
	Single crystal composite synthetic diamond material
Andrew Mark Edmonds, Didcot (GB); Pierre-Olivier Francois Marc Colard, Didcot (GB); and Matthew Lee Markham, Didcot (GB)
Assigned to ELEMENT SIX (UK) LIMITED, Didcot (GB)
Appl. No. 17/593,201
Filed by ELEMENT SIX TECHNOLOGIES LIMITED, Didcot (GB)
PCT Filed Mar. 30, 2020, PCT No. PCT/EP2020/058949 § 371(c)(1), (2) Date Sep. 10, 2021, PCT Pub. No. WO2020/201211, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 1904435 (GB), filed on Mar. 29, 2019.
Prior Publication US 2022/0154368 A1, May 19, 2022
Int. Cl. C30B 25/20 (2006.01); C23C 16/00 (2006.01); C23C 16/02 (2006.01); C23C 16/27 (2006.01); C23C 16/56 (2006.01); C30B 25/16 (2006.01); C30B 25/18 (2006.01); C30B 29/04 (2006.01); C30B 29/68 (2006.01); C30B 33/00 (2006.01)

CPC C30B 25/20 (2013.01) [C23C 16/006 (2013.01); C23C 16/02 (2013.01); C23C 16/27 (2013.01); C23C 16/56 (2013.01); C30B 25/16 (2013.01); C30B 25/186 (2013.01); C30B 25/205 (2013.01); C30B 29/04 (2013.01); C30B 29/68 (2013.01); C30B 33/00 (2013.01)]

17 Claims

1. A diamond composite body comprising:

a first single crystal diamond layer, the first single crystal diamond layer having an NV⁻ concentration of at least 0.3 ppm and a uniform strain, such that over an area of at least 1×1 mm, at least 90 percent of points display a modulus of strain-induced shift of NV resonance of less than 200 kHz, wherein each point in the area is a resolved region of 50 μm²; and

a second single crystal diamond layer having an NV⁻ concentration less than or equal to 10 times lower than the NV⁻ concentration in the first diamond layer.