Patent ID: 8101486

Claim:
A method of fabricating a semiconductor device, the method comprising: providing a bulk substrate formed from a bulk semiconductor material; forming a layer of a first semiconductor material overlying the bulk semiconductor material, the first semiconductor material having a first oxidation rate; forming a layer of a second semiconductor material overlying the layer of the first semiconductor material, the second semiconductor material having a second oxidation rate, the second oxidation rate being less than the first oxidation rate; creating a fin pattern mask on the layer of the second semiconductor material; anisotropically etching the layer of the second semiconductor material using the fin pattern mask as an etch mask, resulting in a fin formed from the second semiconductor material; anisotropically etching the layer of the first semiconductor material using the fin pattern mask as an etch mask to remove portions of the first semiconductor material, resulting in an exposed region of first semiconductor material underlying the fin; and oxidizing the exposed region of first semiconductor material underlying the fin, such that the fin is electrically isolated from the bulk semiconductor material.