Patent ID: 7615417
Filing Date: 2009-11-10
Classification: H01L,Y10T

Abstract:
1. A method for fabricating a silicon controlled rectifier on a substrate comprising the steps of: forming a first well region lightly doped with impurities of a first conductivity type on a surface of said substrate; forming a second well region within said first well region by lightly doping said second well region with impurities of a second conductivity type, said impurities of the second conductivity type having a polarity opposite the impurities of the first conductivity type; forming a first diffusion region within said second well by heavily doping said first diffusion region with the impurities of the first conductivity type; forming a second diffusion region within said first well region a distance from the first diffusion region by heavily doping said second diffusion region with impurities of the second conductivity type; and forming a heavily doped polycrystalline layer at the surface of said substrate and between the first and second diffusion regions and astride a junction of the first well region and the second well region to form a bounding component to prevent silicide formation at junctions of the first diffusion region and the second well region, the first well region and the second region, and the second diffusion region and the first well region during fabrication of said silicon controlled rectifier.