Patent ID: 7582935

Claim:
A SOI structure made by the method comprising: providing a first substrate with a first device region containing a first lightly doped impurity region containing a first highly doped impurity region and a second device region containing a second lightly doped impurity region containing a second highly doped impurity region therein; forming two substantially similar first trenches between the first and second device regions in the first substrate, wherein the depth of the first trenches is deeper than the highly doped impurity regions and shallower than the lightly doped impurity regions; forming two substantially similar second trenches in the first trenches by forming an insulating layer on the surfaces of the first trenches; providing a second substrate on the insulating layer; removing a portion of the first substrate sufficient to expose the first trenches; and forming a first device in the first device region and forming a second device in the second region, wherein the first device and the second device are adjacent each other and comprise complimentary bipolar transistors.