Field-effect transistor-type semiconductor sensor
First Claim
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1. A field-effect transistor-type semiconductor sensor comprising:
- a first semiconductor substrate;
a second semiconductor substrate bonded directly to said first semiconductor substrate interposing an oxide film therebetween;
a source region, a channel region and a drain region, each being provided in said first semiconductor substrate;
a first insulating film on said first semiconductor substrate;
a second insulating film on said first insulating film, said second insulating film being sensitive to a specified ion; and
a source electrode and a drain electrode, each being connected to a corresponding one of said source and drain regions through said second semiconductor substrate.
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Abstract
A field-effect transistor-type semiconductor sensor is provided which comprises first and second semiconductor substrates bonded strongly to each other interposing a silicon oxide film therebetween by the use of a direct-bonding technique. The first semiconductor substrate is formed into an island-shape, and incorporates a source region, a drain region and a gate region. The island-shaped substrate constitutes an ion-sensitive portion, and is immersed in a solution when in use. The second semiconductor substrate has openings in which source and drain electrodes are formed.
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Citations
30 Claims
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1. A field-effect transistor-type semiconductor sensor comprising:
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a first semiconductor substrate; a second semiconductor substrate bonded directly to said first semiconductor substrate interposing an oxide film therebetween; a source region, a channel region and a drain region, each being provided in said first semiconductor substrate; a first insulating film on said first semiconductor substrate; a second insulating film on said first insulating film, said second insulating film being sensitive to a specified ion; and a source electrode and a drain electrode, each being connected to a corresponding one of said source and drain regions through said second semiconductor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A field-effect transistor-type semiconductor sensor comprising:
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a first semiconductor substrate; a second semiconductor substrate bonded directly to said first semiconductor substrate interposing an oxide film therebetween; a source region, a channel region and a drain region, each being provided in said first semiconductor substrate; a first insulating film on said first semiconductor substrate; a second insulating film on said first insulating film, said second insulating film being sensitive to a specified ion; and a source electrode and a drain electrode, each being connected to a corresponding one of said source and drain regions; wherein there are two openings in the second substrate, one opening having a source electrode therein and the other opening having a drain electrode therein, each electrode being connected to a corresponding one of said source and drain regions.
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29. A field-effect transistor-type semiconductor sensor comprising:
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a first semiconductor substrate; a second semiconductor substrate bonded directly to said first semiconductor substrate interposing an oxide film therebetween; a source region, a channel region and a drain region, each being provided in said first semiconductor substrate; a first insulating film on said first semiconductor substrate; a second insulating film on said first insulating film, said second insulating film being sensitive to a specified ion; and a source electrode and a drain electrode, each being connected to a corresponding one of said source and drain regions; wherein a single opening in the second substrate having both source and drain electrodes therein, each electrode being connected to a corresponding one of said source and drain regions.
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30. A field-effect transistor-type semiconductor sensor comprising:
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a first semiconductor substrate; a second semiconductor substrate bonded directly to said first semiconductor substrate interposing an oxide film therebetween; a source region, a channel region and a drain region, each being provided in said first semiconductor substrate; a first insulating film on said first semiconductor substrate; a second insulating film on said first insulating film, said second insulating film being sensitive to a specified ion; and a source electrode and a drain electrode, each being connected to a corresponding one of said source and drain regions; wherein a temperature-compensating diode in said first semiconductor substrate at a position adjoining one of said source region and said drain region.
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Specification