Patent ID: 11929411
Assignee: MICRON TECHNOLOGY, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A recessed access device comprising:
a conductive gate in a trench in semiconductor material;
a gate insulator extending along sidewalls and around a bottom of the conductive gate between the conductive gate and the semiconductor material;
a pair of source/drain regions in upper portions of the semiconductor material on opposing lateral sides of the trench;
a channel region in the semiconductor material below the pair of source/drain regions extending along sidewalls and around a bottom of the trench;
the gate insulator comprising a low-k material and a high-k material, the low-k material being characterized by its dielectric constant k being no greater than 4.0, the high-k material being characterized by its dielectric constant k being greater than 4.0, the low-k material extending completely along all of the sidewalls of and directly under the bottom of the conductive gate, the high-k material being laterally-inward of the low-k material and at least one of (a) and (b), where:
(a): extending less-than-completely along all of the sidewalls of the conductive gate; and
(b): not being directly under the bottom of the conductive gate;

comprising the (a); and
the high-k material is aside a top of the conductive gate at an elevation of the top of the conductive gate.