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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

FIGS. 6-10 illustrate cross-sectional views of various embodiments of a fin of the FinFET device 100 of FIG. 5, in accordance with various embodiments.

FIGS. 11-14, 15A, 15B, 16A, 16B, 17A, 17B, 17C, 17D, 18A, 18B, 19A, 19B, 20A, 20B, 21A, 21B, 22A, 22B, 23A, and 23B are cross-sectional views of intermediate stages in the manufacturing of the FinFET device 100 following the processing of FIG. 5, in accordance with an embodiment.

FIGS. 24A and 24B illustrate the concentrations of boron and germanium, respectively, in the channel region of a FinFET device, in an embodiment.

FIG. 25A illustrates the threshold voltage of a FinFET device with boron diffused into the channel region, in an embodiment.

FIG. 25B illustrates the concentration of germanium in the channel region of a FinFET device, in an embodiment.

FIG. 25C illustrates the threshold voltage of a FinFET device with boron diffusion as illustrated in FIG. 25A and with germanium doped into the channel region as illustrated in FIG. 25B, in an embodiment.

FIG. 26 illustrates a flow chart of a method for forming a semiconductor device, in accordance with some embodiments.

DETAILED DESCRIPTION

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