Patent ID: 6630712
Filing Date: 2003-10-07
Classification: H01L

Abstract:
A transistor with dynamic source/drain extensions, the transistor comprising:a source; a drain; and a gate structure disposed between the source and the drain, the gate structure having a T-shaped gate electrode, a first dielectric structure, a second dielectric structure, and a third dielectric structure, the T-shaped gate electrode having a first wing, a center portion and a second wing, wherein the first dielectric structure and the third dielectric structure include high-k dielectric material having a dielectric constant greater than 20 and are disposed under the first wing and under the second wing, respectively, and not under the center portion, the second dielectric structure being below the center portion, the second dielectric structure being a non-high-k dielectric material whereby deep inversion layers are formed under the first wing and the second wing when a signal is applied to the T-shaped gate electrode, the deep inversion layers acting as dynamic source/drain extensions wherein formation of the dynamic source/drain extensions is achieved through a difference in dielectric constants of the high-k dielectric material and the non-high-k dielectric material.