CMOS-MEMS integrated device including multiple cavities at different controlled pressures and methods of manufacture
First Claim
1. A method of preparing a substrate, comprising:
- depositing and patterning an outgassing source layer and a first outgassing barrier layer on the substrate, resulting in two cross-sections;
depositing conformally a second outgassing barrier layer, wherein in one of the two cross-sections a top surface of the outgassing source layer is not covered by the first and second outgassing barrier layers and in the other of the two cross-sections the outgassing source layer is encapsulated in the first and second outgassing barrier layers;
etching the second outgassing barrier layer such that a spacer of the second outgassing barrier layer is left on at least one sidewall of the outgassing source layer; and
bonding a second substrate to a first substrate comprising the substrate to create bonded substrates and to provide at least one of a first sealed enclosure or a second sealed enclosure, wherein the first sealed enclosure includes one of the two cross-sections, and wherein the second sealed enclosure includes the other of the two cross-sections.
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Abstract
An integrated MEMS device comprises two substrates where the first and second substrates are coupled together and have two enclosures there between. One of the first and second substrates includes an outgassing source layer and an outgassing barrier layer to adjust pressure within the two enclosures. The method includes depositing and patterning an outgassing source layer and a first outgassing barrier layer on the substrate, resulting in two cross-sections. In one of the two cross-sections a top surface of the outgassing source layer is not covered by the outgassing barrier layer and in the other of the two cross-sections the outgassing source layer is encapsulated in the outgassing barrier layer. The method also includes depositing conformally a second outgassing barrier layer and etching the second outgassing barrier layer such that a spacer of the second outgassing barrier layer is left on sidewalls of the outgassing source layer.
28 Citations
15 Claims
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1. A method of preparing a substrate, comprising:
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depositing and patterning an outgassing source layer and a first outgassing barrier layer on the substrate, resulting in two cross-sections; depositing conformally a second outgassing barrier layer, wherein in one of the two cross-sections a top surface of the outgassing source layer is not covered by the first and second outgassing barrier layers and in the other of the two cross-sections the outgassing source layer is encapsulated in the first and second outgassing barrier layers; etching the second outgassing barrier layer such that a spacer of the second outgassing barrier layer is left on at least one sidewall of the outgassing source layer; and bonding a second substrate to a first substrate comprising the substrate to create bonded substrates and to provide at least one of a first sealed enclosure or a second sealed enclosure, wherein the first sealed enclosure includes one of the two cross-sections, and wherein the second sealed enclosure includes the other of the two cross-sections. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification