Patent ID: 9481572
Filing Date: 2016-11-01
CPC Classification: B81B,B81C,G02B,H01L

Claim Text:
1. A method of fabricating an optical electronic device, comprising: forming a dielectric layer over a bottom surface of a semiconductor substrate of a first wafer; forming an anti-reflective coating over a first surface of a transparent substrate of a second wafer; forming a first oxide layer over the anti-reflective coating; directly bonding the first oxide layer of the second wafer to a top surface of the first wafer; selectively etching portions of the dielectric layer down to the semiconductor substrate to define a first end of a cavity; selectively etching portions of the semiconductor substrate down to the first oxide layer to define the cavity through the semiconductor substrate; and selectively etching portions of the first oxide layer down to the anti-reflective coating to define a second end of the cavity, the anti-reflective coating serving as an etch stop relative to an etchant used to etch the first oxide layer.