Patent ID: 8241970
Filing Date: 2012-08-14
Classification: H01L

Abstract:
1. A method for fabricating an integrated circuit having at least one p-FinFET device and at least one n-FinFET device, the method comprising: bonding a first layer having a first crystalline orientation to a second layer having a second crystalline orientation that is different from the first crystalline orientation; forming a masking layer over the first layer, wherein a bottom surface of the masking layer contacts an upper surface of the first layer; selectively etching the masking layer and the first layer, the selectively etching exposing a first vertical portion and a second vertical portion of the first layer and a portion of the second layer; forming a set of sidewall spacers on the first vertical portion and the second vertical portion of the first layer; epitaxially forming, in an empty region of a surface between the set of sidewall spacers, a volume of material extending through the first layer from the second layer up to the surface of first layer, wherein the material has a crystalline orientation that substantially matches the crystalline orientation of the second layer, and wherein a plane of the material is substantially parallel to a plane of the first layer; selectively etching areas of the surface of the first layer that are outside of the region to create a first plurality of fins and areas inside the region to create a second plurality of fins, wherein the first and second plurality of fins are parallel to each other; etching a portion of the second layer forming a base from the second layer under each fin in the first plurality and second plurality of fins, wherein the base comprises a width that is greater than a width of each fin; and oxidizing the base and a corresponding portion of the second layer under each fin in the first plurality and second plurality of fins, and also a set of exposed regions between each fin, the oxidizing forming an isolation layer between each fin in the first plurality and second plurality of fins, where oxide formed under each fin is thicker than oxide formed in the set of exposed regions.