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FinFET device and methods of forming the same

專利號(hào)
US10868183B2
公開日期
2020-12-15
申請(qǐng)人
Taiwan Semiconductor Manufacturing Company, Ltd.(TW Hsinchu)
發(fā)明人
Shahaji B. More; Shih-Chieh Chang; Cheng-Han Lee
IPC分類
H01L29/78; H01L29/66; H01L29/10; H01L29/08; H01L27/092; H01L29/423; H01L21/768; H01L21/8238; H01L21/225; H01L29/161
技術(shù)領(lǐng)域
germanium,dopant,fin,in,region,finfet,layer,epitaxial,segment,silicon
地域: Hsinchu

摘要

A semiconductor device includes a substrate; a fin protruding above the substrate, the fin including a compound semiconductor material that includes a semiconductor material and a first dopant, the first dopant having a different lattice constant than the semiconductor material, where a concentration of the first dopant in the fin changes along a first direction from an upper surface of the fin toward the substrate; a gate structure over the fin; a channel region in the fin and directly under the gate structure; and source/drain regions on opposing sides of the gate structure, the source/drain regions including a second dopant, where a concentration of the second dopant at a first location within the channel region is higher than that at a second location within the channel region, where the concentration of the first dopant at the first location is lower than that at the second location.

說明書

In FIG. 14, a dummy dielectric layer 60 is formed on the fins 58. In embodiments where the capping layer 55 (see FIG. 13) is formed, the dummy dielectric layer 60 is formed on the capping layer 55. The dummy dielectric layer 60 may be, for example, silicon oxide, silicon nitride, a combination thereof, or the like, and may be deposited or thermally grown according to acceptable techniques. The dummy dielectric layer 60 is illustrated in FIG. 14 as being formed over the upper surface and the sidewalls of the fins 58. This is merely a non-limiting example. The dummy dielectric layer 60 may also be formed over the STI regions 56. For example, the dummy dielectric layer 60 may extend continuously from a fin 58 to a neighboring fin 58, and may cover the upper surface of the STI regions 56.

權(quán)利要求

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