Ultra thin surface mount wafer sensor structures and methods for fabricating same
First Claim
1. A method in which a semiconductor sensor device is made comprising:
- coating a semiconductor diaphragm with an oxide layer;
fusion bonding P+ sensor elements to said oxide layer at a relatively central area of said diaphragm;
fusion bonding P+ finger elements to said oxide layer extending from said sensors to an outer contact location outside of the active portion of said diaphragm for each finger;
fusion bonding an external rim of P+ material to said oxide layer and surrounding said sensors and said fingers;
electrostatically bonding a first glass wafer to said fingers and said rim to hermetically seal said sensors and said fingers of said diaphragm member at a top surface, said glass member made with a depression above said sensors and having a plurality of apertures, each aperture associated with a separate finger wherein the apertures are made smaller than the width of such fingers and being aligned with said fingers wherein each aperture associated with a separate finger at said contact location can be accessed via said associated aperture in said glass member;
sealingly coupling a second glass wafer member to a top surface of said first glass wafer and having a plurality of apertures aligned with said plurality of apertures of said first glass wafer member and containing a group of hermetically sealed pins for coupling to said contact locations.
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Abstract
There is disclosed a semiconductor sensor device comprising a semiconductor diaphragm member having a top surface coated with an oxide layer; P+ sensor elements fusion bonded to the oxide layer at a relatively central area of the diaphragm; P+ finger elements fusion bonded to the oxide layer extending from the sensors to an outer contact location of the diaphragm for each finger; and an external rim of P+ material fusion bonded to the oxide layer and surrounding the sensors and fingers. A first glass wafer member is electrostatically bonded at a bottom surface to the fingers and rim to hermetically seal the sensors and fingers of the diaphragm member. The first glass wafer includes a depression above the sensors and has a plurality of apertures, where each aperture is associated with a separate finger at the contact location and each aperture being smaller than the associated finger lining up with the contact location wherein each contact location can be accessed via the associated aperture in the first glass wafer member. A second glass wafer member is sealingly coupled to a top surface of the first glass wafer and has a plurality of apertures aligned with the plurality of apertures of the first glass wafer member and containing a group of hermetically sealed pins for coupling to the contact locations.
68 Citations
12 Claims
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1. A method in which a semiconductor sensor device is made comprising:
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coating a semiconductor diaphragm with an oxide layer;
fusion bonding P+ sensor elements to said oxide layer at a relatively central area of said diaphragm;
fusion bonding P+ finger elements to said oxide layer extending from said sensors to an outer contact location outside of the active portion of said diaphragm for each finger;
fusion bonding an external rim of P+ material to said oxide layer and surrounding said sensors and said fingers;
electrostatically bonding a first glass wafer to said fingers and said rim to hermetically seal said sensors and said fingers of said diaphragm member at a top surface, said glass member made with a depression above said sensors and having a plurality of apertures, each aperture associated with a separate finger wherein the apertures are made smaller than the width of such fingers and being aligned with said fingers wherein each aperture associated with a separate finger at said contact location can be accessed via said associated aperture in said glass member;
sealingly coupling a second glass wafer member to a top surface of said first glass wafer and having a plurality of apertures aligned with said plurality of apertures of said first glass wafer member and containing a group of hermetically sealed pins for coupling to said contact locations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for making a semiconductor sensor device comprising:
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coating a semiconductor diaphragm with an oxide layer;
fusion bonding P+ sensor elements to said oxide layer at a relatively central area of said diaphragm;
fusion bonding P+ finger elements to said oxide layer extending from said sensors to an outer contact location outside of the active portion of said diaphragm for each finger;
fusion bonding an external rim of P+ material to said oxide layer and surrounding said sensors and said fingers;
electrostatically bonding a first glass wafer to said fingers and said rim to hermetically seal said sensors and said fingers of said diaphragm member at a top surface, said glass wafer having a plurality of apertures, each aperture associated with a separate finger, wherein the apertures are tapered and made smaller than the width of such fingers; and
sealingly coupling a second glass wafer member to a top surface of said first glass wafer and having a plurality of apertures aligned with said plurality of apertures of said first glass wafer member and containing a group of hermetically sealed pins for coupling to said contact locations, wherein such apertures are filled almost to a top surface with an unfired metal glass frit and wherein metal spheres are inserted into said frit such that a portion of said sphere protrudes past the top surface of said wafer and firing said semiconductor device to make an electrical contact between said spheres and said metalized regions on said fingers, wherein said metal spheres are hermetically isolated from said diaphragm structure. - View Dependent Claims (12)
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Specification