SEMICONDUCTOR DEVICE WITH OXYGEN-DIFFUSION BARRIER LAYER AND METHOD FOR FABRICATING SAME

摘要

Methods and apparatus are provided for fabricating a transistor. The transistor comprises a gate stack (142, 144, 146) overlying a semiconductor material (104, 106, 108, 110). The gate stack comprises a deposited oxide layer (126) overlying the semiconductor material, an oxygen-diffusion barrier layer (128) overlying the deposited oxide layer, a high-k dielectric layer (134) overlying the oxygen-diffusion barrier layer, and an oxygen-gettering conductive layer (138) overlying the high-k dielectric layer. The oxygen-diffusion barrier layer prevents diffusion of oxygen from the deposited oxide layer to the oxygen-gettering conductive layer.