Patent ID: 6051482
Filing Date: 2000-04-18
Classification: H01L

Abstract:
A method for manufacturing a buried-channel pMOSFET device, comprising:providing an N-type silicon substrate, wherein field oxide layers for defining the active region are already formed on the substrate;forming a sacrificial oxide layer over the substrate;forming a very shallow P-type layer over the substrate rising a plasma doping method including applying boron plasma having an energy level of about 100 eV to 1000 eV and a dosage level of about 1.times.10.sup.12 to 1.times.10.sup.14 cm.sup.-2 for a sufficient period to form a P-type layer having a thickness of about 10 nm to 200 nm;removing the sacrificial oxide layer;forming a gate oxide layer and a polysilicon layer over the substrate, and then doping the polysilicon layer;patterning the polysilicon layer to form a polysilicon gate layer over the substrate; andforming source/drain regions in the substrate.