Conductive etch stop for etching a sacrificial layer
First Claim
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1. A method of forming a micro device, the method comprising:
- forming an isolation layer over a substrate;
forming a first metallic electrode over the isolation layer;
forming a sacrificial layer over the first metallic electrode;
forming a moveable structure over the sacrificial layer; and
etching the sacrificial layer between the moveable structure and the first metallic electrode using the first metallic electrode as an etch stop protecting the isolation layer, the etching of the sacrificial layer forming an air gap between the first metallic electrode and the moveable structure.
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Abstract
In one embodiment, a micro device is formed by depositing a sacrificial layer over a metallic electrode, forming a moveable structure over the sacrificial layer, and then etching the sacrificial layer with a noble gas fluoride. Because the metallic electrode is comprised of a metallic material that also serves as an etch stop in the sacrificial layer etch, charge does not appreciably build up in the metallic electrode. This helps stabilize the driving characteristic of the moveable structure. In one embodiment, the moveable structure is a ribbon in a light modulator.
6 Citations
15 Claims
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1. A method of forming a micro device, the method comprising:
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forming an isolation layer over a substrate;
forming a first metallic electrode over the isolation layer;
forming a sacrificial layer over the first metallic electrode;
forming a moveable structure over the sacrificial layer; and
etching the sacrificial layer between the moveable structure and the first metallic electrode using the first metallic electrode as an etch stop protecting the isolation layer, the etching of the sacrificial layer forming an air gap between the first metallic electrode and the moveable structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of forming a micro device, the method comprising:
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forming an isolation layer over a substrate;
forming a bottom metallic electrode over the isolation layer;
forming a sacrificial layer over the bottom metallic electrode;
forming a resilient structure over the sacrificial layer;
forming a top metallic electrode over the resilient structure; and
etching the sacrificial layer between the resilient structure and the first metallic electrode using the first metallic electrode as an etch stop protecting the isolation layer, the etching of the sacrificial layer forming an air gap between the first metallic electrode and the resilient structure. - View Dependent Claims (12, 13, 14, 15)
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Specification