CHEMICAL MECHANICAL FLATTENING OF BARRIER OR LINER FOR COPPER METALLURGY

    公开(公告)号:JP2001015464A

    公开(公告)日:2001-01-19

    申请号:JP2000131737

    申请日:2000-04-28

    Applicant: IBM

    Abstract: PROBLEM TO BE SOLVED: To obtain a CMP process which increases the removing speed of a liner for copper metallurgy composed of a metal having a high melting point, its alloy or compound, or both the metal and alloy or compound and, at the same time, can minimize the formation of recesses and erosion by removing the liner with slurry containing an oxidizing agent, a corrosion inhibitor, and a surface active agent. SOLUTION: The polishing speeds of a liner 20 and an insulator 10 are controlled so as to make the speeds faster than the polishing speed of copper 22. Namely, in order to make the condition for removing a Ta/TaN liner composed mainly of Ta from a semiconductor substrate which is passivated with silicon dioxide, the liner 20 is removed by CIVIP in acidic slurry containing an oxidizing agent, such as the hydrogen peroxide, a corrosion inhibitor, such as the demineralized water, BTA, etc., and a surface active agent, such as the Duponol SP, etc. Consequently, a CMP process which can increase the removing speed of the liner and, at the same time, can minimize the formation of recesses and erosion can be obtained.

    METHOD FOR PREPARING ELECTRICALLY CONNECTING CONDUCTIVE PAD AND FORMED CONDUCTIVE PAD

    公开(公告)号:JP2001267356A

    公开(公告)日:2001-09-28

    申请号:JP2001032285

    申请日:2001-02-08

    Applicant: IBM

    Abstract: PROBLEM TO BE SOLVED: TO provide a method for preparing an electrically connected copper pad having superior diffusing barrier characteristics and bonding characteristic. SOLUTION: The method for preparing an electrically connecting conductive pad comprises the steps of first preparing a copper pad surface 14 cleaned by an acid solution, than adhering a protective layer of a phosphorus or a boron-containing metal alloy to the surface of the pad, and then adhering an adhesive layer 18 of a noble metal onto the protective layer. In this case, a suitable thickness of the protective layer is in the range of 1,000 to about 10,000 Åor preferably about 3,000 to about 7,000 Å. The adhesive layer is formed of the noble metal, such as Au, Pt, Pd, Ag or the like and can be formed into a thickness of about 500 to about 4,000 Å or preferably about 1,000 to about 2,000 Å. Or before electrolessly adhering of the protective layer, a Pd nucleating layer may be adhered between the surface of the copper conductive pad and the protective layer.

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