Patent ID: 8614468

Claim:
A device comprising: a p-type field-effect transistor (FET) comprising: a first gate dielectric comprising a first vertical portion and a first horizontal portion, wherein an end of the first horizontal portion is connected to a lower end of the first vertical portion; a first source/drain region on a first side of the first vertical portion, wherein a bottom surface of the first source/drain region is higher than the first horizontal portion; a second source/drain region on a second side of the first vertical portion opposite the first side of the first vertical portion, wherein a portion of the second source/drain region is lower than the first horizontal portion, and wherein the first and the second source/drain regions are of opposite conductivity types; and a first gate electrode directly over the first vertical portion, wherein a sidewall of the first gate electrode contacts the first vertical portion; and an n-type FET comprising: a second gate dielectric comprising a second vertical portion and a second horizontal portion, wherein an end of the second horizontal portion is connected to a lower end of the second vertical portion, and wherein at least one of the second vertical portion and the second horizontal portion has a thickness different from a respective one of the second vertical portion and the first horizontal portion; a third source/drain region on a first side of the second vertical portion, wherein a bottom surface of the third source/drain region is higher than the second horizontal portion; a fourth source/drain region on a second side of the second vertical portion opposite the first side of the second vertical portion, wherein a portion of the fourth source/drain region is lower than the second horizontal portion, and wherein the third and the fourth source/drain regions are of opposite conductivity types; and a second gate electrode directly over the second vertical portion, wherein a sidewall of the second gate electrode contacts the second vertical portion.