Structure and fabricating method with self-aligned bit line...

Details Structure and fabricating method with self-aligned bit line... Structure and fabricating method with self-aligned bit line...

2005-11-15

2005-11-15

Sarkar, Asok Kumar (Department: 2891)

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

C438S257000

Reexamination Certificate

active

06965144

ABSTRACT:
A new structure is disclosed for semiconductor devices in which contact regions are self-aligned to conductive lines. Openings to a gate oxide layer, in partially fabricated devices on a silicon substrate, have insulating sidewalls. First polysilicon lines disposed against the insulating sidewalls extend from below the top of the openings to the gate oxide layer. Oxide layers are grown over the top and exposed sides of the first polysilicon lines serving to insulate the first polysilicon lines. Polysilicon contact regions are disposed directly over and connect to silicon substrate regions through openings in the gate oxide layer and fill the available volume of the openings. Second polysilicon lines connect to the contact regions and are disposed over the oxide layers grown on the first polysilicon lines.

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