Method of making high speed semiconductor device having a silicon-on-insulator structure
First Claim
1. A method of fabricating a semiconductor device, comprising the steps of:
- (a) forming an insulating layer on a silicon substrate having a (110) surface plane;
(b) forming an opening in the insulating layer so as to expose a part of the substrate;
(c) depositing a silicon layer on the insulating layer and the exposed part of the substrate;
(d) dividing the deposited silicon layer into first and second islands, the first island contacting the substrate through the opening and the second island being isolated from the substrate;
(e) recrystallizing the first island to form a (110) plane and the second island to form a (100) plane;
(f) forming a p-channel field effect transistor on the recrystallized first island; and
(g) forming an n-channel field effect transistor on the recrystallized second island.
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Accused Products
Abstract
A CMOS silicon-on-insulation structure is fabricated by first forming an insulating SiO2 layer on a silicon substrate having a (110) plane. Openings are then formed in the SiO2 layer to expose a part of the substrate, and a polycrystalline or an amorphous silicon layer is deposited on the SiO2 layer and in the openings. The deposited silicon layer is divided into islands so that a first island includes one of the openings and a second island does not include any openings. A laser beam is then irradiated onto the islands so as to melt the islands, and when the laser light irradiation is discontinued, the melted islands recrystallize so that the first island forms a (110) plane and the second island forms a (100) plane. A p-channel MOSFET is fabricated on the first island, and an n-channel MOSFET is fabricated on the second island. The thus paired CMOS operates at high speeds, because the p-channel MOSFET using positive holes as the carrier is fast in a (110) crystal, and the n-channel MOSFET using electrons as the carrier is fast in a (100) crystal.
233 Citations
17 Claims
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1. A method of fabricating a semiconductor device, comprising the steps of:
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(a) forming an insulating layer on a silicon substrate having a (110) surface plane; (b) forming an opening in the insulating layer so as to expose a part of the substrate; (c) depositing a silicon layer on the insulating layer and the exposed part of the substrate; (d) dividing the deposited silicon layer into first and second islands, the first island contacting the substrate through the opening and the second island being isolated from the substrate; (e) recrystallizing the first island to form a (110) plane and the second island to form a (100) plane; (f) forming a p-channel field effect transistor on the recrystallized first island; and (g) forming an n-channel field effect transistor on the recrystallized second island. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of fabricating a semiconductor device, comprising the steps of:
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(a) forming an insulating layer on a silicon substrate having a (110) surface plane; (b) forming openings in the insulating layer to expose portions of the substrate therethrough; (c) depositing a silicon layer on the insulating layer and the exposed portions of the substrate; (d) dividing the deposited silicon layer into a plurality of first islands which include at least one of the openings and a plurality of second islands which include none of the openings; (e) melting and recrystallizing the first and second islands; (f) forming a p-channel field effect transistor on the recrystallized first islands; and (g) forming n-channel field effect transistors on the recrystallized second islands. - View Dependent Claims (9, 10, 11)
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12. A method of fabricating a semiconductor device, comprising the steps of:
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(a) forming an insulating layer on a silicon substrate having first surface plane indices; (b) forming an opening in the insulating layer so as (c) forming first and second silicon islands on the insulating layer, the first island being connected to the substrate through the opening and the second layer being isolated from the substrate; (d) recrystallizing the first island to form the first surface plane indices therein and the second island to form second surface plane indices therein; (e) forming a first-type field effect transistor on the recrystallized first island; and (f) forming a second-type field effect transistor, opposite in polarity from the first-type field effect transistor, on the recrystallized second island. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification