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    • 31. 发明申请
    • DUAL EXPOSURE TRACK ONLY PITCH SPLIT PROCESS
    • 双重接触跟踪只能分离分离过程
    • US20110049680A1
    • 2011-03-03
    • US12551801
    • 2009-09-01
    • Sean D. BurnsMatthew E. ColburnSteven J. Holmes
    • Sean D. BurnsMatthew E. ColburnSteven J. Holmes
    • H01L29/06G03F7/20H01L21/461
    • H01L21/31144G03F7/0035H01L21/0271H01L21/0338
    • An integrated circuit is formed with structures spaced more closely together than a transverse dimension of such structures, such as for making contacts to electronic elements formed at minimum lithographically resolvable dimensions by dark field split pitch techniques. Acceptable overlay accuracy and process efficiency and throughput for the split pitch process that requires etching of a hard mark for each of a plurality of sequentially applied and patterned resist layers is supported by performing the etching of the hard mask entirely within a lithography track through using an acid sensitive hard mark material and an acidic overcoat which contacts areas of the hard mask through patterned apertures in the resist. The contacted areas of the hard mask are activated for development by baking of the acidic overcoat.
    • 集成电路形成为具有比这种结构的横向尺寸更紧密地在一起的结构,例如用于通过暗场分割俯仰技术以最小可光滑分辨尺寸形成的电子元件的接触。 对于需要蚀刻多个顺序施加的和图案化的抗蚀剂层中的每一个的硬标记的分割间距处理的可接受的覆盖精度和处理效率和处理量通过使用 酸敏感的硬标记材料和通过抗蚀剂中的图案化孔接触硬掩模的区域的酸性外涂层。 通过烘烤酸性外涂层来激活硬掩模的接触区域以进行显影。
    • 32. 发明授权
    • Lithography for pitch reduction
    • 减光平版印刷
    • US07883829B2
    • 2011-02-08
    • US12184438
    • 2008-08-01
    • Steven J. HolmesXuefeng HuaWillard E. Conley
    • Steven J. HolmesXuefeng HuaWillard E. Conley
    • G03F7/00G03F7/20G03F7/40
    • H01L21/0337H01L21/0338
    • In one embodiment, a photoresist is lithographically patterned to form an array of patterned photoresist portions having a pitch near twice a minimum feature size. Fluorine-containing polymer spacers are formed on sidewalls of the patterned photoresist portions. The pattern of the fluorine-containing polymer spacers is transferred into an underlying layer to form a pattern having a sublithographic pitch. In another embodiment, a first pattern in a first photoresist is transferred into a first ARC layer underneath to form first ARC portions. A planarizing second optically dense layer, a second ARC layer, and a second photoresist are applied over the first ARC portions. A second pattern in the second photoresist is transferred into the second ARC layer to form second ARC portions. The combination of the first ARC portions and second ARC portions function as an etch mask to pattern an underlying layer with a composite pattern having a sublithographic pitch.
    • 在一个实施例中,光刻胶被图案化以形成具有接近两倍最小特征尺寸的间距的图案化光致抗蚀剂部分的阵列。 含氟聚合物间隔物形成在图案化的光致抗蚀剂部分的侧壁上。 将含氟聚合物间隔物的图案转移到下层中以形成具有亚光刻间距的图案。 在另一个实施例中,将第一光致抗蚀剂中的第一图案转移到下面的第一ARC层中以形成第一ARC部分。 在第一ARC部分上施加平坦化的第二光致密层,第二ARC层和第二光致抗蚀剂。 将第二光致抗蚀剂中的第二图案转移到第二ARC层中以形成第二ARC部分。 第一ARC部分和第二ARC部分的组合用作蚀刻掩模,以用具有亚光刻间距的复合图案来图案化下面的层。