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    • 4. 发明授权
    • Method of reducing the effect of implantation damage to shallow trench isolation regions during the formation of variable thickness gate layers
    • 在形成可变厚度栅极层期间减少对浅沟槽隔离区的注入损伤的影响的方法
    • US06569739B1
    • 2003-05-27
    • US10216425
    • 2002-08-08
    • Arvind KamathVenkatesh P. Gopinath
    • Arvind KamathVenkatesh P. Gopinath
    • H01L21336
    • H01L21/823462H01L21/26506H01L21/76237H01L21/823481
    • Embodiments of the invention include a method for blanket ion implanting a semiconductor substrate surface to induce uniform damage over desired portions of the surface thereby reducing non-uniform etch effects caused by the varying etch rates of surface materials and conditions during surface cleaning. The invention includes providing a semiconductor substrate having gate oxide regions and a sacrificial oxide layer of a predetermined thickness formed thereon. The surface of the substrate is pattern masked to reveal openings in the gate oxide regions and ion implanted through the openings in the pattern mask to form gate oxide regions. The pattern mask is removed from the substrate and a blanket implantation of the sacrificial oxide layer is performed. The substrate is then cleaned to remove the sacrificial oxide layer leaving the substrate in readiness for further processing.
    • 本发明的实施例包括用于覆盖离子注入半导体衬底表面以在表面的所需部分上引起均匀损伤的方法,从而减少由表面材料的变化蚀刻速率和表面清洁期间的条件引起的不均匀的蚀刻效应。 本发明包括提供具有形成在其上的预定厚度的栅极氧化物区域和牺牲氧化物层的半导体衬底。 衬底的表面被图案掩模以露出栅极氧化物区域中的开口,并且通过图案掩模中的开口注入离子以形成栅极氧化物区域。 从衬底去除图案掩模,并执行牺牲氧化物层的覆盖注入。 然后清洁衬底以除去离开衬底的牺牲氧化物层以备进一步处理。