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    • 3. 发明授权
    • Method for forming trenches having different widths and the same depth
    • 用于形成具有不同宽度和相同深度的沟槽的方法
    • US08138093B2
    • 2012-03-20
    • US12539930
    • 2009-08-12
    • Hakeem B. S. Akinmade-YusuffSamuel S. Choi
    • Hakeem B. S. Akinmade-YusuffSamuel S. Choi
    • H01L21/311
    • H01L21/31144H01L21/0335H01L21/3085H01L21/31138
    • A lithographic material stack including a photo-resist and an organic planarizing layer is combined with an etch process that generates etch residues over a wide region from sidewalls of etched regions. By selecting the etch chemistry that produces deposition of etch residues from the organic planarizing layer over a wide region, the etch residue generated at the sidewalls of the wide trench is deposited over the entire bottom surface of the wide trench. An etch residue portion remains at the bottom surface of the wide trench when the organic planarizing layer is etched through in the first trench region. The etch residue portion is employed in the next step of the etch process to retard the etch rate in the wide trench, thereby producing the same depth for all trenches in the material layer into which the pattern of the lithographic material stack is transferred.
    • 包括光致抗蚀剂和有机平坦化层的平版印刷材料堆叠与在蚀刻区域的侧壁的宽区域上产生蚀刻残留物的蚀刻工艺组合。 通过选择在宽的区域上产生来自有机平坦化层的蚀刻残留物沉积的蚀刻化学物质,在宽沟槽的侧壁处产生的蚀刻残留物沉积在宽沟槽的整个底表面上。 当在第一沟槽区域中蚀刻有机平坦化层时,蚀刻残留部分保留在宽沟槽的底表面。 蚀刻残留部分用于蚀刻工艺的下一步骤以延迟宽沟槽中的蚀刻速率,从而为材料层中所有的平版印刷材料堆叠的图案被转移到其中的所有沟槽产生相同的深度。