Patent ID: 6114234
Filing Date: 2000-09-05
Classification: H01L

Abstract:
A method of making a semiconductor with a passivating film for copper interconnects comprising the steps of:depositing a first oxide layer over a semiconductor substrate;forming an etch stop layer over the first oxide layer;forming a second oxide layer over the etch stop layer;etching a first set of openings within the second oxide layer and then through the etch stop layer;etching at least a second set of openings in the first oxide layer within the bounds defined by the first set of openings;depositing a copper layer at least over selected portions of the second oxide layer such that copper is deposited within the first and second sets of openings and over at least portions of the second oxide layer adjacent the first set of openings;forming a passivating film on top of the deposited copper layer by depositing a chromite and forming a respective copper chromite composition; andchemically mechanically polishing the passivating film with a slurry containing a nitric acid.