MEMS pressure sensor and manufacturing method therefor
First Claim
1. A Micro Electromechanical System (MEMS) pressure sensor comprising:
- a first substrate provided with a sensitive diaphragm of a piezoresistive pressure sensing unit, an electrical connecting diffusion layer and a first bonding layer on a surface of the first substrate;
a second substrate provided with an inter-conductor dielectric layer, a conductor connecting layer in the inter-conductor dielectric layer and/or a second bonding layer on a surface of the second substrate; and
a reference pressure cavity which is disposed between the sensitive diaphragm and the second substrate, wherein the reference pressure cavity is a single cavity surrounded by a wall, the wall comprising at least one element selected from a group consisting of the first bonding layer and the second bonding layer;
wherein the second substrate is arranged opposite to the first substrate, and the second substrate is fixedly coupled to the first substrate via the first bonding layer and the second bonding layer;
the pattern of the first bonding layer is corresponding to the pattern of the second bonding layer, and both the first bonding layer and the second bonding layer are formed of a conductive material.
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Abstract
A Micro Electromechanical System (MEMS) pressure sensor may include a first substrate provided with a sensitive diaphragm of a piezoresistive pressure sensing unit, an electrical connecting diffusion layer and a first bonding layer on a surface of the first substrate; and a second substrate provided with an inter-conductor dielectric layer, a conductor connecting layer in the inter-conductor dielectric layer and/or a second bonding layer on a surface of the second substrate. The second substrate may be arranged opposite to the first substrate, and the second substrate may be fixedly coupled to the first substrate via the first bonding layer and the second bonding layer; the pattern of the first bonding layer is corresponding to the pattern of the second bonding layer, and both the first bonding layer and the second bonding layer may be formed of a conductive material.
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Citations
19 Claims
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1. A Micro Electromechanical System (MEMS) pressure sensor comprising:
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a first substrate provided with a sensitive diaphragm of a piezoresistive pressure sensing unit, an electrical connecting diffusion layer and a first bonding layer on a surface of the first substrate; a second substrate provided with an inter-conductor dielectric layer, a conductor connecting layer in the inter-conductor dielectric layer and/or a second bonding layer on a surface of the second substrate; and a reference pressure cavity which is disposed between the sensitive diaphragm and the second substrate, wherein the reference pressure cavity is a single cavity surrounded by a wall, the wall comprising at least one element selected from a group consisting of the first bonding layer and the second bonding layer; wherein the second substrate is arranged opposite to the first substrate, and the second substrate is fixedly coupled to the first substrate via the first bonding layer and the second bonding layer;
the pattern of the first bonding layer is corresponding to the pattern of the second bonding layer, and both the first bonding layer and the second bonding layer are formed of a conductive material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A manufacturing method for a MEMS pressure sensor comprising:
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providing a first substrate, and forming, in the first substrate, a piezoresistive pressure sensing unit with a sensitive diaphragm, an electrical connecting diffusion layer and a first bonding layer on a surface of the first substrate; providing a second substrate, and forming, in the second substrate, an inter-conductor dielectric layer, a conductor connecting layer in the inter-conductor dielectric layer and/or a second bonding layer on a surface of the second substrate; and arranging the first bonding layer to be opposite to the second bonding layer, and bonding the first bonding layer to the second bonding layer according to a pattern correspondence so as to fixedly and electrically couple the first substrate to the second substrate, and to form, between the sensitive diaphragm and the second substrate, a reference pressure cavity, wherein the reference pressure cavity is a single cavity surrounded by a wall, the wall comprises at least one element selected from a group consisting of the first bonding layer and the second bonding layer; with a sidewall comprising at least one element selected from a group consisting of the first bonding layer and the second bonding layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification