Patent ID: 9263528
Filing Date: 2016-02-16
CPC Classification: H01L

Claim Text:
1. A method comprising: providing a substrate that defines an upper surface and comprising at least two fin-shaped areas separated by an isolation region; forming trenches in the substrate in the at least two fin-shaped areas, wherein the trenches are about 300 nm deep; growing a semiconductor alloy material at least in the trenches using a technique that allows aspect ratio trapping of dislocations in the trenches, thereby forming at least two elongated structures separated by the isolation region, wherein, for each of the at least two elongated structures: (i) the elongated structure comprises the semiconductor alloy material of a first semiconductor material and a second semiconductor material, and (ii) a relaxed portion of the elongated structure below the upper surface of the substrate comprises the semiconductor alloy material in a relaxed and substantially defect-free condition, wherein the substantially defect-free condition is achieved when there are substantially no defects appearing as a consequence of propagating dislocations in the semiconductor alloy material; subjecting the substrate to a condensation-oxidation, such that, for each of the at least two elongated structures, the elongated structure forms a fin and an oxide layer, wherein (i) the fin comprises a fin base portion formed of the semiconductor alloy material and a fin top portion of the first semiconductor material in a strained condition, the fin top portion being formed by condensation of the first semiconductor material, and (ii) the oxide layer comprises an oxide of the second semiconductor material, the oxide layer being formed by oxidation of the second semiconductor material; and removing at least some of the oxide layer.