Patent ID: 6093629
Filing Date: 2000-07-25
Classification: H01L

Abstract:
A method for forming contacts to semiconductive elements on a silicon wafer comprising:(a) providing a silicon wafer having n- and p-type semiconductive elements;(b) depositing an insulative layer over said semiconductive elements;(c) depositing a first photoresist layer on said insulative layer;(d) patterning said first photoresist layer to define p-type contacts to said p-type semiconductive elements;(e) etching said insulative layer thereby forming p-contact openings;(f) implanting p-type impurity into said p-contact openings;(g) stripping said first photoresist layer;(h) depositing a second photoresist layer on said insulative layer;(i) patterning said second photoresist layer to define n-type contacts to said n-type semiconductive elements while covering said p-contact openings;(j) etching said insulative layer thereby forming n-contact openings;(k) implanting n-type impurity ions into said n-contact openings;(l) stripping said second photoresist layer; and(m) forming conductive plugs in said n-contact openings and said p-contact openings.