Patent ID: 6350636
Filing Date: 2002-02-26
Classification: H01L

Abstract:
A test device for evaluating the quality of a junction after the formation of a silicide layer comprising:(a) a region on a silicon wafer of a first conductivity type; (b) a field isolation layer with a first opening in said region; (c) a planar region of a second conductivity type in said region of said first conductivity type defined by the lateral extent of said first opening; (d) a polysilicon gate stack band on said field isolation layer surrounding and concentric with said first opening; (e) a band of silicon oxide surrounding and concentric with said first opening and extending over both said polysilicon gate stack band and inward beyond the edge of said opening thereby having an inner perimeter which defines a second opening, smaller than and concentric with said first opening; (f) a silicide layer on and limited to the extent of said planar region within said second opening; and (g) probe pads electrically connected to said region of said first conductivity type and to said silicide layer.