Methods of reducing CD loss in a microelectromechanical device
First Claim
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1. A method of fabricating an electromechanical systems device, comprising:
- providing a sacrificial material;
forming a first metal layer over the sacrificial material;
etching the first metal layer to form at least one first opening in the first metal layer to thereby expose a first surface of the sacrificial material;
forming a second layer over the first surface of the sacrificial material, wherein the second layer has a smaller thickness dimension than the first metal layer; and
etching the second layer to form at least one second opening in the second layer to thereby expose at least a portion of the first surface of the sacrificial material, wherein the second opening has a smaller dimension than the first opening.
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Abstract
Methods of fabricating an electromechanical systems device that minimize critical dimension (CD) loss in the device are described. The methods provide electromechanical systems devices with improved properties, including high reflectivity.
231 Citations
26 Claims
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1. A method of fabricating an electromechanical systems device, comprising:
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providing a sacrificial material; forming a first metal layer over the sacrificial material; etching the first metal layer to form at least one first opening in the first metal layer to thereby expose a first surface of the sacrificial material; forming a second layer over the first surface of the sacrificial material, wherein the second layer has a smaller thickness dimension than the first metal layer; and etching the second layer to form at least one second opening in the second layer to thereby expose at least a portion of the first surface of the sacrificial material, wherein the second opening has a smaller dimension than the first opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for fabricating an electromechanical systems device, comprising:
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providing a sacrificial material; forming a first metal layer over the sacrificial material; etching the first metal layer to form at least one opening in the first metal layer to thereby expose a first surface area of the sacrificial material; forming a second layer over the first surface area of the sacrificial material, the second layer having a smaller thickness dimension than the first metal layer; forming a first masking layer over the second layer and over a portion of the first surface area of the sacrificial material to thereby form an unmasked portion of the second layer over the first surface area; and etching the unmasked portion of the second layer to form at least one opening in the second layer to thereby expose a second surface area of the sacrificial material, wherein the resulting exposed second surface area of the sacrificial material is smaller than the first surface area of the sacrificial material. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification