Patent ID: 7592678

Claim:
A semiconductor device, comprising: a first transistor formed in a first region of a workpiece, the first transistor comprising a first gate dielectric including a first element, wherein the first element comprises a first material, wherein the first gate dielectric includes a second material, wherein the first element comprises Sc, Y, Lu, Pr, La, Ce, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb, wherein the second material comprises Hf, Zr, Ta, Ti, Al, or Si, and wherein the first gate dielectric comprises a third material, wherein the third material comprises Ti, Sr, or Sc; and a second transistor formed in a second region of the workpiece, the second region adjacent to the first region and separated by an isolation region, wherein the second transistor comprises a second gate dielectric including a second element, wherein the second element comprises a first material, wherein the second gate dielectric includes a second material, wherein the second element comprises Sc, Y, Lu, Pr, La, Ce, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb, wherein the second material comprises Hf, Zr, Ta, Ti, Al, or Si; and wherein the second element is different than the first element, and wherein the second gate dielectric does not comprise the first element.