Patent ID: 7871873

Claim:
A method of fabricating a fin structure for a semiconductor device, the method comprising: providing a bulk substrate formed from a first semiconductor material; forming a layer of etch stop/marker material overlying the bulk substrate; forming a layer of second semiconductor material overlying the layer of etch stop/marker material, wherein the etch stop/marker material serves as an indicator layer during etching of the second semiconductor material; creating a fin pattern mask on the layer of second semiconductor material; anisotropically etching the layer of second semiconductor material, using the fin pattern mask as an etch mask, resulting in a fin formed from the second semiconductor material, wherein the layer of etch stop/marker material remains substantially intact following etching; forming spacers adjacent sidewalls of the fin; and selectively etching the layer of etch stop/marker material, using the fin pattern mask and the spacers as a second etch mask, to form a neck region underlying the fin.