Patent ID: 6376879
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A semiconductor device comprising:a first transistor on a semiconductor substrate having a gate electrode and a diffusion layer, transferring a first operating voltage; a second transistor on the semiconductor substrate having a gate electrode and a diffusion layer, transferring a second operating voltage for driving a memory cell higher than the first operating voltage; a dielectric film having a first contact hole reaching the diffusion layer of the first transistor and a second contact hole reaching the diffusion layer of the second transistor, said dielectric film covering the first and second transistors; first side-wall films provided on sides of the gate electrodes of the first and second transistors; and second side-wall films provided on sides of the first side-wall films of the second transistor and different in material from the first side-wall films, an etching rate for opening the contact holes of the first side-wall films being lower than an etching rate of the second side-walls; wherein the diffusion layer of the second transistor has a Lightly-Doped-Drain structure, and a width defined between an edge of the gate of the second transistor and the second contact hole being greater than a width defined between an edge of the gate of the first transistor and the first contact hole.