Thin capping for MEMS devices
First Claim
1. A method of making a micro-device with a capping structure, comprising:
- providing a base substrate on which there is a micro-electronic and/or micro-mechanic component attached or integrated;
providing a cap substrate of a glass material that exhibits a glass transition when heated towards the liquid state, selected from the group consisting of borofloat glasses, quartz, metallic alloys, AlOx, and polymers;
making micro-depressions in said cap substrate to a predetermined depth;
metallizing only walls of the micro-depressions in the cap substrate;
providing an electrical connection through the cap substrate by thinning the cap substrate on an opposite side from where the micro-depressions are made and exposing the metal in the micro-depressions;
stopping the thinning before the metal is exposed;
making openings to expose the metal;
metallizing the openings to provide contact and to hermetically seal the electrical connection; and
bonding together the base substrate and the cap substrate, such that there is an electrical contact between the component on the base substrate and the metallized micro-depressions in the cap substrate.
1 Assignment
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Accused Products
Abstract
A device includes a base substrate (700) with a micro component (702) attached thereto. Suitably it is provided with routing elements (704) for conducting signals to and from the component (702). It also includes spacer members (706) which also can act as conducting structures for routing signals vertically. There is a capping structure (708) of a glass material, provided above the base substrate (700), bonded via the spacer members (706), preferably by eutectic bonding, wherein the capping structure (708) includes vias (710) including metal for providing electrical connection through the capping structure. The vias can be made by a stamping/pressing method entailing pressing needles under heating to soften the glass and applying pressure, to a predetermined depth in the glass. However, other methods are possible, e-g- drilling, etching, blasting.
13 Citations
10 Claims
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1. A method of making a micro-device with a capping structure, comprising:
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providing a base substrate on which there is a micro-electronic and/or micro-mechanic component attached or integrated; providing a cap substrate of a glass material that exhibits a glass transition when heated towards the liquid state, selected from the group consisting of borofloat glasses, quartz, metallic alloys, AlOx, and polymers; making micro-depressions in said cap substrate to a predetermined depth; metallizing only walls of the micro-depressions in the cap substrate; providing an electrical connection through the cap substrate by thinning the cap substrate on an opposite side from where the micro-depressions are made and exposing the metal in the micro-depressions; stopping the thinning before the metal is exposed; making openings to expose the metal; metallizing the openings to provide contact and to hermetically seal the electrical connection; and bonding together the base substrate and the cap substrate, such that there is an electrical contact between the component on the base substrate and the metallized micro-depressions in the cap substrate. - View Dependent Claims (2, 3, 7, 8, 9)
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4. A method of making a micro-device with a capping structure, comprising:
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providing a base substrate on which there is a micro-electronic and/or micro-mechanic component attached or integrated; providing a cap substrate of a glass material that exhibits a glass transition when heated towards the liquid state, selected from the group consisting of borofloat glasses, quartz, metallic alloys, AlOx, and polymers; making micro-depressions in said cap substrate to a predetermined depth by stamping or pressing a plurality of needles protruding from a support substrate, into the cap substrate under heating and pressure; metallizing only walls of the micro-depressions in the cap substrate; providing an electrical connection through the cap substrate; and bonding together the base substrate and the cap substrate, such that there is an electrical contact between the component on the base substrate and the metallized micro-depressions in the cap substrate. - View Dependent Claims (5, 6)
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10. A method of making a micro-device with a capping structure, comprising:
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providing a base substrate on which there is a microelectronic and/or micro-mechanic component attached or integrated; providing a cap substrate of a glass material, a non-crystalline or amorphous material and that exhibits a glass transition when heated towards the liquid state, selected from the group consisting of borofloat glasses, quartz, metallic alloys, AlOx, and polymers; making micro-depressions in said cap substrate to a predetermined depth by stamping or pressing a plurality of needles protruding from a support substrate, into the cap substrate under heating and pressure; wherein the needles are left in the cap substrate after the depressions and only the support substrate is removed so as to leave metal filled holes in the cap substrate material; providing electrical connection through the cap substrate; and bonding together the base substrate and the cap substrate, such that there is an electrical contact between the component on the base substrate and the metallized depressions in the cap substrate.
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Specification