Patent ID: 7554139

Claim:
A production method for a semiconductor device, comprising: step (A) of providing a substrate including a semiconductor layer having a principal face, the substrate having a device isolation structure formed in an isolation region for partitioning the principal face into a plurality of device active regions; step (B) of growing an epitaxial layer containing Si and Ge, or Si and C, on selected device active regions among the plurality of device active regions of the principal face of the semiconductor layer; and step (C) of forming a field-effect transistor in, among the plurality of device active regions, each of the device active regions, wherein, step (A) comprises step (a1) of forming, in the isolation region, a plurality of dummy regions surrounded by the device isolation structure; step (B) comprises step (b1) of forming a selective-growth mask; step (b2) of growing a layer of the same material as that of the epitaxial layer on selected regions among the plurality of dummy regions; and step (b3) of removing the selective-growth mask; wherein the selective-growth mask has apertures over the selected device active regions among the plurality of device active regions and over the selected regions among the plurality of dummy regions, and completely covers at least some of the plurality of device active regions; and the plurality of device active regions, the plurality of dummy regions, and the selective-growth mask are formed in such a manner that a ratio of a total area of the plurality of device active regions and the plurality of dummy regions relative to a chip area is in a predetermined range and that an aperture ratio of the selective-growth mask for growing the epitaxial layer relative to the chip area is in a predetermined range.