Field effect semiconductor devices and method of making same

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357 233, 357 2311, 357 90, 357 49, 357 239, 357 55, 357 50, 357 56, H01L 2978

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045367825

ABSTRACT:
A transistor is formed about a recess in the planar surface of a substrate of silicon. A pair of insulating spacers is provided in the recess, each abutting a respective side of the recess. Gate oxide is formed in the recess between the insulating spacers. A gate electrode is provided having one base overlying the gate oxide and the other base substantially coplanar with the planar surface. A source region extends from one side of the channel underlying the gate oxide to the planar surface. A drain region extends from the other side of the channel underlying the gate oxide to the planar surface.

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patent: 4186408 (1980-01-01), Esch et al.
patent: 4212100 (1980-07-01), Paivinen et al.
patent: 4243997 (1981-01-01), Natori et al.
patent: 4282647 (1981-08-01), Richman
patent: 4324038 (1982-04-01), Chang et al.

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