Methods of forming oxide masks with submicron openings and microstructures formed thereby
First Claim
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1. A method of processing a substrate to form a movable microstructure, comprising:
- forming a layer of oxide on a substrate;
patterning the layer of oxide to form shallow trenches therein;
depositing a layer of sacrificial polysilicon on the patterned layer of oxide;
depositing a second layer of oxide on the patterned layer of sacrificial polysilicon to fill the shallow trenches;
etching back the second layer of oxide to expose the sacrificial polysilicon;
etching the layer of sacrificial polysilicon to form submicron openings therein, andetching the substrate to form high aspect ratio trenches to form movable microstructure by undercutting.
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Abstract
Processing techniques are disclosed for batch fabrication of microstructures comprising an oxide mask on a substrate with submicron openings formed therein, and microstructures having deep-submicron, high aspect-ratio etched trenches, using conventional optical photolithography. Exemplary high aspect-ratio etched-trench microstructures that may be produced include single crystal resonators and sensors.
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2 Claims
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1. A method of processing a substrate to form a movable microstructure, comprising:
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forming a layer of oxide on a substrate; patterning the layer of oxide to form shallow trenches therein; depositing a layer of sacrificial polysilicon on the patterned layer of oxide; depositing a second layer of oxide on the patterned layer of sacrificial polysilicon to fill the shallow trenches; etching back the second layer of oxide to expose the sacrificial polysilicon; etching the layer of sacrificial polysilicon to form submicron openings therein, and etching the substrate to form high aspect ratio trenches to form movable microstructure by undercutting. - View Dependent Claims (2)
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Specification