Patent ID: 8354310
Filing Date: 2013-01-15
Classification: H01L

Abstract:
1. A manufacturing method of SOI MOS device having a source/body ohmic contact comprising steps of: (A) forming a shallow trench isolation structure on a buried insulation layer on Si substrate to isolate an active region and creating a gate region on the active region; (B) forming a lightly doped N type source region with high dopant concentration and a lightly doped N type drain region with high dopant concentration via high dose source light doping process and drain light doping process respectively, wherein the dose of the source light doping process and drain light doping process could reach a volume level of 1e15/cm (C) forming an insulation spacer around the gate region, forming a N type Si source region and a N type drain region via source and drain ion implantation, a body region formed between the N type Si source region and the N type drain region; (D) performing large tilt heavily-doped P ion implantation in an inclined direction via a mask with an opening at the position of the N type Si source region and implanting P ions into the space between the N type Si source region and the N type drain region to form a heavily-doped P-type region; wherein the angle between a longitudinal line of the N type Si source region and the inclined direction is ranging from 15 to 45 degrees; (E) forming a metal layer on the N type Si source region, then allowing the reaction between the metal layer and the remained Si material underneath to form silicide by heat treatment and proceeding the reaction until the silicide formed being contact with the buried insulation layer; the left Si material which has not been react with the metal layer becoming N-type Si region, and a N-type source region being formed by the silicide and the N-type Si region; the heavily-doped P-type region being contact with the buried insulation layer, the body region, the N-type Si region of the N-type source region and the silicide respectively, and an ohmic contact formed between the heavily-doped P-type region and the silicide.