Patent ID: 7141495

Claim:
A method of forming a structure, comprising: forming a dielectric layer on a substrate, a metal structure with metal oxide thereon in the dielectric layer, and enhancing solubility of the metal oxide by using H2O with a temperature higher than about 10° C. or a liquid or vapor of a chemical with a temperature higher than about 15° C., wherein the chemical comprises a pure polar solution or a polar solution with H2O, wherein the step of forming the metal structure in the dielectric layer comprises: forming a hole in the dielectric layer; forming a metal layer in the hole and over the dielectric layer; and removing a portion of the metal layer above a surface of the dielectric layer, wherein the step of removing the portion of the metal layer comprises a chemical-mechanical polishing (CMP) process; and performing a CMP oxide buffing process after the CMP process, the step of enhancing the solubility of the metal oxide being performed after the CMP oxide buffing process.