Integrated circuit including power diode
First Claim
1. A method of fabricating an integrated circuit including a power diode in a semiconductor body comprising the steps of:
- a) providing a semiconductor substrate including a surface layer of a first conductivity type.b) forming a dielectric material in a surface of the semiconductor substrate around a first region in which a power diode is to be fabricated and separated from a second region in which an integrated circuit is to be fabricated,c) forming semiconductor material of a second conductivity type in the first region,d) fabricating an integrated circuit in the second region,e) fabricating a plurality of MOS source/drain elements and associated gate elements in a surface of a device region and in the semiconductor material of a second conductivity type,f) forming a first diode electrode contacting the plurality of MOS source/drain elements and associated gate elements, andg) forming a conductive via front the surface of the device region to the semiconductor material of the second conductivity type as a second diode electrode.
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Accused Products
Abstract
A method of fabricating a semiconductor integrated circuit including a power diode includes providing a semiconductor substrate of first conductivity type, fabricating a integrated circuit such as a CMOS transistor circuit in a first region of the substrate, and fabricating a power diode in a second region in the semiconductor substrate. Dielectric material is formed between the first region and the second regions thereby providing electrical isolation between the integrated circuit in the first region and the power diode in the second region. The power diode can comprise a plurality of MOS source/drain elements and associated gate elements all connected together by one electrode of the diode, and a semiconductor layer in the second region can function as another source/drain of the power diode.
26 Citations
17 Claims
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1. A method of fabricating an integrated circuit including a power diode in a semiconductor body comprising the steps of:
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a) providing a semiconductor substrate including a surface layer of a first conductivity type. b) forming a dielectric material in a surface of the semiconductor substrate around a first region in which a power diode is to be fabricated and separated from a second region in which an integrated circuit is to be fabricated, c) forming semiconductor material of a second conductivity type in the first region, d) fabricating an integrated circuit in the second region, e) fabricating a plurality of MOS source/drain elements and associated gate elements in a surface of a device region and in the semiconductor material of a second conductivity type, f) forming a first diode electrode contacting the plurality of MOS source/drain elements and associated gate elements, and g) forming a conductive via front the surface of the device region to the semiconductor material of the second conductivity type as a second diode electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor integrated circuit comprising:
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a semiconductor substrate having material of a first conductivity type; a first region in the substrate in which an integrates circuit is fabricated; a second region in the substrate having semiconductor material of a second conductivity type in which a power diode is fabricated; dielectric material between the first region and the second region providing electrical isolation between the first region and the second region wherein the second region includes epitaxial semiconductor material grown in a trench in one surface of the substrate, and the dielectric material comprises spacers fanned on sidewalls of the trench; and wherein the power diode includes a conductive layer on a surface of the substrate functioning as a first electrode, and a conductive via extending from the surface into the substrate and contacting semiconductor material of the second conductivity type which functions as a second electrode. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification