Patent ID: 6472328
Filing Date: 2002-10-29
Classification: H01L,Y10S

Abstract:
A method of forming an electrical contact to semiconductive material comprising:forming an insulative layer over a contact area of semiconductive material; etching a contact opening through the insulative layer to the semiconductive material contact area, said contact etching changing an outer portion of the semiconductive material exposed by the contact etching; first implanting a conductivity enhancing impurity into the changed outer portion through the contact opening; after the first implanting, etching the changed outer portion of the semiconductive material through the contact opening substantially selective relative to semiconductive material therebeneath which is unchanged; after etching the changed outer portion, second implanting a conductivity enhancing impurity into the semiconductive material through the contact opening; and after the second implanting, forming conductively doped semiconductive material within the contact opening in contact with semiconductive material which is unchanged from said contact opening etching.