Patent ID: 6333217
Filing Date: 2001-12-25
Classification: H01L

Abstract:
A method of fabricating a semiconductor device, the method comprising the steps of:ion implanting a first-conductivity-type impurity into a surface portion of a semiconductor substrate to form a first-conductivity-type semiconductor layer as a channel region;forming a gate electrode on the semiconductor substrate with a gate insulating film interposed therebetween;ion implanting a second-conductivity-type impurity into the semiconductor layer by using the gate electrode as a mask to form first second-conductivity-type impurity layers in upper portions of the semiconductor layer;implanting indium ions into the semiconductor layer by using the gate electrode as a mask to form first-conductivity-type impurity layers in lower portions of the semiconductor layer;performing a short-time heat treatment with respect to the semiconductor substrate at a temperature of about 950.degree. C. to 1050.degree. C.;forming sidewalls on side surfaces of the gate electrode; andion implanting a second-conductivity-type impurity into the first second-conductivity-type impurity layers and into the first-conductivity-type impurity layers by using the gate electrode and the sidewalls as a mask to form source/drain regions each composed of a second second-conductivity-type impurity layer in respective regions of the first second-conductivity-type impurity layers and the first-conductivity-type impurity layers located on both sides of the gate electrode, form second-conductivity-type extension regions inwardly of respective upper portions of the source/drain regions in the respective first second-conductivity-type impurity layers, and form first-conductivity-type pocket regions inwardly of respective lower portions of the source/drain regions in the respective first-conductivity-type impurity layers.