Patent ID: 6137142
Filing Date: 2000-10-24
Classification: H01L

Abstract:
A semiconductor device comprising:a semiconductor substrate formed of a bulk material of a first conductivity type and having a first dopant concentration, said semiconductor substrate having a substrate top surface and a substrate bottom surface, opposite said substrate top surface;a semiconductor well of a second conductivity type contained in said semiconductor substrate, said well having a well top surface coextensive with a first portion of said substrate top surface, a well bottom surface, opposite said well top surface, a first well side surface and a second well side surface, opposite said first well side surface; anda buried semiconductor region of said first conductivity type, said buried semiconductor region having a buried semiconductor region top surface, said buried semiconductor region being situated in said semiconductor substrate below said well bottom surface and interposed between said well bottom surface and said semiconductor substrate bulk material such that said buried semiconductor region top surface abuts said well bottom surface and said buried semiconductor region does not contact both said first and second well side surfaces, said buried semiconductor region having a second dopant concentration of said first conductivity type which is greater than said first dopant concentration of said first conductivity type;wherein, said buried semiconductor region is positioned between said well bottom surface and said semiconductor substrate bulk material to reduce leakage across a junction between said semiconductor well and said semiconductor substrate bulk material.