Field effect transistor with improved source/drain diffusion reg

Details Field effect transistor with improved source/drain diffusion reg Field effect transistor with improved source/drain diffusion reg

1999-04-23

2000-12-19

Ngo, Ngan V.

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

257395, 257401, H01L 2976, H01L 2994, H01L 31062, H01L 31113, H01L 31119

Patent

active

061630578

ABSTRACT:
The invention provides a diffusion region structure in a semiconductor device wherein the diffusion region is applied with alternating voltages in an operation of the semiconductor device. The structure comprises at least one diffusion region being doped with an impurity of a first conductivity type at a first impurity concentration and also being provided in a semiconductor bulk region doped with an impurity of a second conductivity type at a second impurity concentration lower than the first impurity concentration, and at least a diffusion capacitance reduction layer provided under the diffusion region so as to be in contact with a bottom of the diffusion region. The diffusion capacitance reduction layer may be doped with an impurity of the second conductivity type at a third impurity concentration which is at least lower than the second impurity concentration of the semiconductor bulk region and not lower than zero or may be mode of an insulating material to thereby reduce a capacitance of the diffusion region.

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