Method for manufacturing a semiconductor acceleration sensor device
First Claim
1. A method for manufacturing a semiconductor device including a semiconductor wafer having a functional element formed on a surface thereof and a cap covering the functional element with a spatial portion being provided with respect to this functional element on the surface of the semiconductor wafer, comprising:
- a functional element forming step of forming a plurality of functional elements on the semiconductor wafer for the formation of the functional elements and forming pads for making wire connection between each functional element and the outside, between the functional element and a predetermined position of the semiconductor wafer at which this semiconductor wafer is to be divided;
a bonding frame forming step of forming a bonding frame surrounding each functional element in a region around each functional element on the surface of the semiconductor wafer and on a side nearer to the functional element than to the pad;
a bonding step of bonding a cap forming wafer having a leg portion at a position corresponding to the bonding frame, onto the semiconductor wafer by making bondage between the leg portion and the bonding frame; and
a cutting step of cutting the semiconductor wafer at the predetermined position thereof at which this semiconductor wafer is to be divided and also cutting the cap forming wafer at a cutting position on a side nearer to the bonding frame than to the position of the cap forming wafer that opposes the pad.
1 Assignment
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Accused Products
Abstract
On a silicon wafer there is formed a movable gate MOS transistor (sensing element: functional element). A bonding frame consisting of a silicon thin film is patterned around an element formation region on the surface of the silicon wafer. On a cap forming silicon wafer there is projectively provided a leg portion on the bottom surface of which a bonding layer consisting of a gold film is formed. The cap forming silicon wafer is disposed on the silicon wafer, whereupon heating with respect thereto is performed at a temperature equal to higher than a gold/silicon eutectic temperature to thereby make bondage between the bonding frame of the silicon wafer and the bonding layer of the cap forming silicon wafer. Thereafter, the both wafers are diced in chip units.
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Citations
20 Claims
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1. A method for manufacturing a semiconductor device including a semiconductor wafer having a functional element formed on a surface thereof and a cap covering the functional element with a spatial portion being provided with respect to this functional element on the surface of the semiconductor wafer, comprising:
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a functional element forming step of forming a plurality of functional elements on the semiconductor wafer for the formation of the functional elements and forming pads for making wire connection between each functional element and the outside, between the functional element and a predetermined position of the semiconductor wafer at which this semiconductor wafer is to be divided; a bonding frame forming step of forming a bonding frame surrounding each functional element in a region around each functional element on the surface of the semiconductor wafer and on a side nearer to the functional element than to the pad; a bonding step of bonding a cap forming wafer having a leg portion at a position corresponding to the bonding frame, onto the semiconductor wafer by making bondage between the leg portion and the bonding frame; and a cutting step of cutting the semiconductor wafer at the predetermined position thereof at which this semiconductor wafer is to be divided and also cutting the cap forming wafer at a cutting position on a side nearer to the bonding frame than to the position of the cap forming wafer that opposes the pad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for manufacturing a semiconductor device including a semiconductor wafer having a functional element formed on a surface thereof and a cap covering the functional element with a spatial portion being provided with respect to this functional element on the surface of the semiconductor wafer, comprising:
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a functional element forming step of forming a plurality of functional elements on the semiconductor wafer for the formation of the functional elements; a bonding frame forming step of forming a bonding frame in a region surrounding each functional element on the surface of the semiconductor wafer and on a side nearer by a prescribed distance to the functional element than to the predetermined position of the semiconductor wafer at which this semiconductor wafer is to be divided; a bonding step of bonding a cap forming wafer having a leg portion at a position corresponding to the bonding frame pattern, onto the semiconductor wafer by making bondage between the leg portion and the bonding frame; and a cutting step of cutting the semiconductor wafer at the predetermined position thereof at which this semiconductor wafer is to be divided and also cutting the cap forming wafer at a cutting position on a side nearer to the bonding frame than to the position of the cap forming wafer that opposes the predetermined position of the semiconductor wafer at which this semiconductor wafer is to be divided.
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13. A method for manufacturing a semiconductor device including a semiconductor wafer having a functional element formed on a surface thereof and a cap covering the functional element with a spatial portion being provided with respect to this functional element on the surface of the semiconductor wafer, comprising:
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a first step of patterning a bonding frame consisting of a silicon thin film around a region for the formation of the functional element on a surface of the semiconductor wafer for the formation of the functional element and patterning a bonding layer consisting of a gold (Au) film at a position of the cap forming wafer that corresponds to the bonding frame pattern; a second step of heating up to a temperature higher than a gold/silicon eutectic temperature in a state wherein the bonding frame of the semiconductor wafer and the bonding layer of the cap forming wafer are in contact with each other to thereby bond the bonding frame of the semiconductor wafer and the bonding layer of the cap forming wafer; and a third step of dicing the semiconductor wafer in chip units. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification