Silicon wafer including both bulk and SOI regions and method for forming same on a bulk silicon wafer
First Claim
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1. A semiconductor device comprising:
- a) a substrate having 1) a silicon-on-insulator region including an insulating layer of buried oxide at least partially separating a thin semiconductor device layer at a top surface of the substrate from a bulk silicon layer, and 2) a bulk region, wherein the bulk silicon layer extends to the top surface of the substrate; and
b) a logic circuit comprising an silicon-on-insulator circuit portion formed from silicon-on-insulator devices in the silicon-on-insulator region and a bulk circuit portion formed from bulk semiconductor structures formed in the bulk region;
wherein the silicon-on-insulator portion is operatively coupled to the bulk circuit portion.
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Abstract
A silicon substrate comprises a silicon-on-insulator (SOI) portion which includes an insulating silicon dioxide layer beneath a device layer. SOI circuit structures, including SOI field effect transistors, are formed in the device layer. The substrate also comprises a bulk portion. Bulk semiconductor circuit structures are formed in wells in the bulk portion. The bulk circuit structures may be coupled to the SOI circuit structures.
99 Citations
20 Claims
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1. A semiconductor device comprising:
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a) a substrate having 1) a silicon-on-insulator region including an insulating layer of buried oxide at least partially separating a thin semiconductor device layer at a top surface of the substrate from a bulk silicon layer, and 2) a bulk region, wherein the bulk silicon layer extends to the top surface of the substrate; and
b) a logic circuit comprising an silicon-on-insulator circuit portion formed from silicon-on-insulator devices in the silicon-on-insulator region and a bulk circuit portion formed from bulk semiconductor structures formed in the bulk region;
wherein the silicon-on-insulator portion is operatively coupled to the bulk circuit portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 16, 17, 18)
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9. A method of forming a silicon logic circuit comprising the steps of:
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a) masking a portion of a top surface of a silicon substrate to form a masked region corresponding to a bulk circuit portion in which a bulk silicon layer of the substrate extends to the top surface of the substrate, and an unmasked region corresponding to at least part of a silicon-on-insulator circuit portion;
b) performing an oxygen implant to oxidize the silicon substrate to form an insulating layer of silicon dioxide beneath the unmasked region; and
c) forming silicon-on-insulator circuit structures in the silicon-on-insulator circuit portion and bulk circuit structures in the bulk circuit portion. - View Dependent Claims (10, 11, 12, 13, 14, 15, 19, 20)
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Specification