Patent ID: 11908678
Assignee: APPLIED MATERIALS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 0:
1. A method of forming a filled contact hole in a mirror layer of a semiconductor substrate, the method comprising:
forming a contact hole through a mirror layer of the semiconductor substrate by an etch process;
filling the contact hole with a fill material, wherein a portion of the fill material overlies the mirror layer and the mirror layer is electrically isolated from a metal layer below the mirror layer;
removing a portion of the fill material external to the contact hole by chemical mechanical polishing landing on the mirror layer; and
forming an optical stack overlying the mirror layer and the fill material, wherein the optical stack comprises a distributed Bragg reflector (DBR) that forms an interface with the mirror layer and the fill material, and the DBR is characterized by a reflectance exceeding 95% across a wavelength range of 450 nm-650 nm.