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Field effect transistors having a fin

專利號
US10096696B2
公開日期
2018-10-09
申請人
MICRON TECHNOLOGY, INC.(US ID Boise)
發(fā)明人
Toru Tanzawa
IPC分類
H01L27/00; H01L29/66; H01L29/78; H01L29/06; H01L27/112
技術(shù)領(lǐng)域
dielectric,fin,drains,uppermost,vertical,may,fins,be,e.g,in
地域: ID ID Boise

摘要

An embodiment of a transistor has a semiconductor fin, a dielectric over the semiconductor fin, a control gate over the dielectric, and source/drains in the semiconductor fin and having upper surfaces below an uppermost surface of the semiconductor fin. Another embodiment of a transistor has first and second semiconductor fins, a first source/drain region in the first semiconductor fin and extending downward from an uppermost surface of the first semiconductor fin, a second source/drain region in the second semiconductor fin and extending downward from an uppermost surface of the second semiconductor fin, a dielectric between the first and second semiconductor fins and adjacent to sidewalls of the first and second semiconductor fins, and a control gate over the dielectric and between the first and second semiconductor fins and extending to a level below upper surfaces of the first and second source/drain regions.

說明書

In FIG. 11E, a control gate 820 is formed over dielectric 810 from a conductor 1150. For example, 1150 may be formed over the exposed upper surface of dielectric 710 and the exposed surfaces of dielectric 810. Conductor 1150 may then be subsequently removed so that control gate 820 is over a portion of the upper surface of dielectric 710, over dielectric 810, and thus over the uppermost (e.g., the top) surface of semiconductor fin 720 at vertical level Z0, as shown in FIG. 11E. In an alternative example, the portions of dielectric 810 and the portions of dielectric 710 uncovered by control gate 820 in FIG. 11E may be covered, e.g., by a mask, while conductor 1150 is deposited to form control gate 820.

Subsequently, for some embodiments, source/drain 615 and source/drain 617 may be formed in semiconductor fin 720 so that the upper (e.g., the uppermost) surfaces of source/drain 615 and source/drain 617 are at the vertical level Z1 below the uppermost surface of semiconductor fin 720 at the vertical level Z0. For example, the upper surfaces of source/drain 615 and source/drain 617 may be coincident with surfaces of semiconductor fin 720 that are at the vertical level Z1 such that source/drain 615 and source/drain 617 do not extend above those surfaces of semiconductor fin 720.

權(quán)利要求

1
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