Patent ID: 6064088
Filing Date: 2000-05-16
Classification: H01L

Abstract:
A lateral RF MOS transistor having a plug connective structure comprising:a semiconductor material of a first conductivity type, said semiconductor material having a first dopant concentration and a top surface;a conductive gate overlying and insulated from said top surface of said semiconductor material, said gate further comprising:a first gate region;a second gate region; anda third gate region;a first region formed completely within said semiconductor material of said first conductivity type, said first region being of a second conductivity type and having a second dopant concentration to form an enhanced drain drift region of said RF MOS transistor structure, said enhanced drain drift region underlying said first gate region;a second region formed in said semiconductor material, said second region being of said second conductivity type and having a third dopant concentration greater than said second dopant concentration to form a drain region of said RF MOS transistor, said second region contacting said first region;a third region formed in said semiconductor material, said third region being of said first conductivity type and having a fourth dopant concentration to form a body region of said RF MOS transistor structure, said fourth dopant concentration being equal or greater than said first dopant concentration, said body region further including:a channel region formed in said body region when a voltage is applied to said gate, said channel region underlying said third gate region;a fourth region formed in said semiconductor material, said fourth region being of said second conductivity type and having a fifth dopant concentration to form a source region of said RF MOS transistor structure, said fourth region being located within said third region;a fifth region formed in said semiconductor material, said fifth region being of said first conductivity type and having a sixth dopant concentration to form a contact enhancement region of said RF MOS transistor structure, said sixth dopant concentration being greater than said fourth dopant concentration of said third region, said fifth region being located within said third region; anda conductive plug region formed in said source region and said body region of said semiconductor material;wherein a remaining portion of said epitaxial layer underlying said second gate region is of said first conductivity type; andwherein said enhanced drain drift region and said channel region are separated by said remaining portion of said epitaxial layer.