Patent ID: 6365523
Filing Date: 2002-04-02
Classification: H01L

Abstract:
A method for forming a series of patterned planarized aperture fill layers within a series of apertures within a topographic substrate layer employed within a microelectronics fabrication comprising:providing a topographic substrate layer employed within a microelectronics fabrication, the topographic substrate layer comprising a series of mesas of substantially equivalent height but of differing widths, the series of mesas being separated by a series of apertures; forming upon the topographic substrate layer a blanket first aperture fill layer, the blanket first aperture fill layer being formed employing a first simultaneous deposition and sputter method, the blanket first aperture fill layer filling the series of apertures to a planarizing thickness at least as high as the height of the mesas while simultaneously forming a series of protrusions of the blanket first aperture fill layer corresponding with the series of mesas, where the thickness of a protrusion of the blanket first aperture fill layer over a narrow mesa is less than the thickness of a protrusion of the blanket first aperture fill layer over a wide mesa, and where the first simultaneous deposition and sputter method employs a first deposition rate:sputter rate ratio which provides sufficient thickness of the blanket first aperture fill layer over the narrow mesa such that upon chemical mechanical polish (CMP) planarizing the blanket first aperture fill layer to form a series of patterned planarized first aperture fill layers within the series of apertures erosion of the narrow mesa is attenuated; forming a patterned photoresist layer upon the blanket first aperture fill layer, the patterned photoresist layer overlying the apertures leaving exposed the protrusions within the blanket fill aperture fill layer over at least the narrow and wide mesas; etching at least partially the protrusions within the blanket first aperture fill layer over the mesas left exposed by the patterned photoresist layer; and chemical mechanical polish (CMP) planarizing the blanket first aperture fill layer to form the series of patterned planarized first aperture fill layers within the series of apertures.