Patent ID: 7645703
Filing Date: 2010-01-12
Classification: G02F

Abstract:
1. A method for chemical mechanical polishing of mirror structures, the method comprising: providing a semiconductor substrate; forming a first dielectric layer overlying the semiconductor substrate; forming an aluminum layer overlying the dielectric layer, the aluminum layer having an upper surface with a predetermined roughness of greater than 20 Angstroms in RMS; patterning the aluminum layer to expose portions of the dielectric layer, the exposed portions forming borders surrounding one of a plurality of patterns of the patterned aluminum layer, the one of the plurality of patterns corresponding to a pixel element; forming a second dielectric layer overlying the patterned aluminum layer and exposed portions of the dielectric layer; removing a portion of the second dielectric layer to a region within a vicinity of the upper surface of the patterned aluminum layer; processing regions overlying the patterned aluminum layer using a touch-up polishing process to reduce a surface roughness of the upper surface of the patterned aluminum to less than 5 Angstroms to form a mirror surface on the upper surface of the patterned aluminum, the mirror surface corresponding to the pixel element, wherein the processing includes processing the upper surface of the patterned aluminum; and depositing a protective layer overlying the upper surface of the patterned aluminum to protect the mirror surface.