Patent ID: 9482863
Filing Date: 2016-11-01
CPC Classification: B81B,B81C,G02B,H01L

Claim Text:
1. A method for fabrication of a device from a wafer of semiconductor material having first and second sides, the method comprising: depositing a dielectric layer on at least the first side of the wafer; etching, using a first etching process, a pattern of features of the device through the dielectric layer into the semiconductor material on the first side of the wafer; after etching the pattern, removing the dielectric layer to expose the semiconductor material over at least an area of the wafer that contains the pattern; after removing the dielectric layer, locally thinning the entire exposed area of the wafer that contains the pattern and from which the dielectric layer was removed to a predefined thickness by removing the semiconductor material from at least the first side of the wafer using a second, wet etching process, while preserving the pattern in the area, wherein removing the dielectric layer comprises leaving the dielectric layer in place only around a perimeter of the device thereby preventing thinning of the perimeter during the wet etching process; and etching through the thinned wafer in the area of the device so as to release a moving part of the device.