Microelectromechanical device and method utilizing a porous surface
First Claim
1. A method of making a microelectromechanical systems device, comprising:
- forming a fixed electrode;
forming a sacrificial layer over the fixed electrode;
forming a movable electrode; and
forming a porous dielectric layer after forming the fixed electrode and before forming the movable electrode such that the porous layer has a porous surface facing one of the electrodes, wherein the porous surface is substantially continuous while including a plurality of pores formed therethrough;
wherein forming the porous dielectric layer comprises forming a porous dielectric layer prior to forming the sacrificial layer and a second porous dielectric layer after forming the sacrificial layer.
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Abstract
A microelectromechanical device (MEMS) utilizing a porous electrode surface for reducing stiction is disclosed. In one embodiment, a microelectromechanical device is an interferometric modulator that includes a transparent electrode having a first surface; and a movable reflective electrode with a second surface facing the first surface. The movable reflective electrode is movable between a relaxed and actuated (collapsed) position. An aluminum layer is provided on either the first or second surface. The aluminum layer is then anodized to provide an aluminum oxide layer which has a porous surface. The porous surface, in the actuated position, decreases contact area between the electrodes, thus reducing stiction.
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Citations
17 Claims
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1. A method of making a microelectromechanical systems device, comprising:
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forming a fixed electrode; forming a sacrificial layer over the fixed electrode; forming a movable electrode; and forming a porous dielectric layer after forming the fixed electrode and before forming the movable electrode such that the porous layer has a porous surface facing one of the electrodes, wherein the porous surface is substantially continuous while including a plurality of pores formed therethrough;
wherein forming the porous dielectric layer comprises forming a porous dielectric layer prior to forming the sacrificial layer and a second porous dielectric layer after forming the sacrificial layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of making a microelectromechanical systems device, comprising:
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forming a fixed electrode; forming a sacrificial layer over the fixed electrode; forming a movable electrode; forming a porous layer after forming the fixed electrode and before forming the movable electrode such that the porous layer has a porous surface facing one of the electrodes, wherein the porous surface is substantially continuous while including a plurality of pores formed therethrough, wherein the movable electrode comprises an aluminum reflective layer, and wherein the porous layer is formed directly on the reflective layer such that the porous layer faces the fixed electrode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification