Sheppard Mullin Richter & Hampton LLP
Methods of planarizing structures on wafers and substrates by polishing
Methods of planarizing structures formed on the surfaces of substrates and wafers are disclosed. The methods form a planarizing layer over the surface and the structures, or the locations where the structures are to be formed, such that the top surface of the layer has low areas between the locations of the structures, and such that the low areas lie substantially within a plane which is below the tops of the structures. A polish-stop layer is thee formed over the low areas of the planarizing layer, the polish-stop layer being more resistant to polishing than the planarizing layer and, preferably, the structures. The resulting surface is then polished. The polishing may be accomplished by, for example, standard mechanical polishing, and chemical-mechanical polishing.
Fujitsu Limited
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Solomon I. Michael G. William T. Larry Louis Wen-chou Vincent
Beilin Lee Chou Moresco Wang