Patent ID: 7863117
Filing Date: 2011-01-04
Classification: H01L,Y10S

Abstract:
1. A method of forming a circuit, comprising the steps of: forming a lower semiconductor device having a first active region comprising a semiconductor with a first crystal orientation; forming, separately, an upper semiconductor device having a second active region comprising a semiconductor with a second crystal orientation; and in a separate step after the forming the upper semiconductor device, superimposing the formed upper semiconductor device on the lower semiconductor device, wherein: the forming the lower semiconductor device comprises: the forming the upper semiconductor device comprises forming: the superimposing comprises forming a bonding layer between a top of the lower semiconductor device and a bottom of the upper semiconductor device, wherein the bonding layer contacts a bottom portion of the second substrate and bonds the upper semiconductor device to the lower semiconductor device; and the first crystal orientation is different from the second crystal orientation.