Transducer having a resonating silicon beam and method for...

Details Transducer having a resonating silicon beam and method for... Transducer having a resonating silicon beam and method for...

G - Physics

01

L

G01L 9/00 (2006.01) G01L 1/10 (2006.01) G01L 1/18 (2006.01) G01L 9/06 (2006.01) G01P 15/08 (2006.01)

Patent

CA 2176052

A method of forming apparatus including a force transducer on a silicon substrate having an upper surface, the silicon substrate including a dopant of one of the n-type or the p-type, the force transducer including a cavity having spaced end walls and a beam supported in the cavity, the beam extending between the end walls of the cavity, the method including the steps of: (a) implanting in the substrate a layer of a dopant of said one of the n-type or the p-type; (b) depositing an epitaxial layer on the upper surface of the substrate, the epitaxial layer including a dopant of the other of the n-type or the p-type; (c) implanting a pair of spaced sinkers through the epitaxial layer and into electrical connection with said layer, each of the sinkers including a dopant of the one of the n-type or the p-type; (d) anodizing the substrate to form porous silicon of the sinkers and the layer; (e) oxidizing the porous silicon to form silicon dioxide; and (f) etching the silicon dioxide to form the cavity and beam.

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