Patent ID: 11913136
Assignee: CRYSTAL IS, INC.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 8:
9. A single-crystalline AlN boule having a length of approximately 15 mm or larger, wherein a diameter of at least a portion of the AlN boule is approximately 50 mm or larger, and wherein:
an ultraviolet (UV) absorption coefficient of the AlN boule is less than 60 cm−1 for a wavelength range of approximately 220 nm to approximately 480 nm;
an oxygen concentration of the AlN boule is less than 4×1017 cm−3;
a carbon concentration of the AlN boule is less than 4×1017 cm−3; and
a ratio of the carbon concentration of the AlN boule to the oxygen concentration of the AlN boule is less than 1.0.