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    • 6. 发明授权
    • Method for forming a trench in a layer or a layer stack on a semiconductor wafer
    • 在半导体晶片上的层或层叠中形成沟槽的方法
    • US07049241B2
    • 2006-05-23
    • US10937099
    • 2004-09-08
    • Uwe Paul SchroederMatthias GoldbachTobias Mono
    • Uwe Paul SchroederMatthias GoldbachTobias Mono
    • H01L21/302H01L21/461
    • H01L27/11568H01L21/0274H01L21/0337H01L21/3086Y10S438/924
    • Preferably using a positive resist, a resist ridge (20) is formed in a photosensitive resist (16) applied on a semiconductor wafer (1) above a hard mask layer (12). The resist ridge (20) serves as a mask for a subsequent implantation step (46). This makes use of an effect whereby the material of the hard mask layer (12), in a part (122) shaded by the resist ridge (20), can be etched out selectively with respect to the implanted part (121). The consequently patterned hard mask layer is used as an etching mask with respect to an underlying layer or layer stack (102–104) that is actually to be patterned. From the resist ridge (10) that has been formed as a line in the photosensitive resist (16), in a type of tone reversal, an opening (24) has been formed in the hard mask layer and a trench (26) has been formed in the layer/layer stack (102–104). According to the invention, the width (51, 52) of the resist ridge (20) is reduced by exposing the resist ridge (20) to an oxygen plasma (42). As a result, it is possible to form a trench (26) in the hard mask layer (12) and in the layer/layer stack (102–104) the width (52) of which trench is smaller than the lithographic resolution limit during the lithographic patterning of the resist (16).
    • 优选使用正性抗蚀剂,在施加在硬掩模层(12)上方的半导体晶片(1)上的光敏抗蚀剂(16)中形成抗蚀剂脊(20)。 抗蚀剂脊(20)用作随后的注入步骤(46)的掩模。 这利用了可以相对于植入部分(121)选择性地蚀刻出由抗蚀剂脊(20)遮蔽的部分(122)中的硬掩模层(12)的材料的效果。 因此,图案化的硬掩模层相对于实际上被图案化的下层或层叠(102-104)用作蚀刻掩模。 从形成为光敏抗蚀剂(16)中的线的抗蚀剂脊(10)以一种音调反转形式,在硬掩模层中形成有开口(24),并且已经形成了沟槽(26) 形成在层/层堆叠(102-104)中。 根据本发明,通过将抗蚀剂脊(20)暴露于氧等离子体(42)来减小抗蚀剂脊(20)的宽度(51,52)。 结果,可以在硬掩模层(12)和层/层堆叠(102-104)中形成沟槽(26),其中沟槽的宽度(52)小于光刻分辨率极限 抗蚀剂(16)的平版印刷图案化。
    • 7. 发明申请
    • Method for forming a trench in a layer or a layer stack on a semiconductor wafer
    • 在半导体晶片上的层或层叠中形成沟槽的方法
    • US20050106890A1
    • 2005-05-19
    • US10937099
    • 2004-09-08
    • Uwe SchroederMatthias GoldbachTobias Mono
    • Uwe SchroederMatthias GoldbachTobias Mono
    • H01L21/027H01L21/033H01L21/302H01L21/308H01L21/461H01L21/8236H01L21/8246H01L21/8247
    • H01L27/11568H01L21/0274H01L21/0337H01L21/3086Y10S438/924
    • Preferably using a positive resist, a resist ridge (20) is formed in a photosensitive resist (16) applied on a semiconductor wafer (1) above a hard mask layer (12). The resist ridge (20) serves as a mask for a subsequent implantation step (46). This makes use of an effect whereby the material of the hard mask layer (12), in a part (122) shaded by the resist ridge (20), can be etched out selectively with respect to the implanted part (121). The consequently patterned hard mask layer is used as an etching mask with respect to an underlying layer or layer stack (102-104) that is actually to be patterned. From the resist ridge (10) that has been formed as a line in the photosensitive resist (16), in a type of tone reversal, an opening (24) has been formed in the hard mask layer and a trench (26) has been formed in the layer/layer stack (102-104). According to the invention, the width (51, 52) of the resist ridge (20) is reduced by exposing the resist ridge (20) to an oxygen plasma (42). As a result, it is possible to form a trench (26) in the hard mask layer (12) and in the layer/layer stack (102-104) the width (52) of which trench is smaller than the lithographic resolution limit during the lithographic patterning of the resist (16).
    • 优选使用正性抗蚀剂,在施加在硬掩模层(12)上方的半导体晶片(1)上的光敏抗蚀剂(16)中形成抗蚀剂脊(20)。 抗蚀剂脊(20)用作随后的注入步骤(46)的掩模。 这利用了可以相对于植入部分(121)选择性地蚀刻出由抗蚀剂脊(20)遮蔽的部分(122)中的硬掩模层(12)的材料的效果。 因此,图案化的硬掩模层相对于实际上被图案化的下层或多层叠层(102-104)用作蚀刻掩模。 从形成为光敏抗蚀剂(16)中的线的抗蚀剂脊(10)以一种音调反转形式,在硬掩模层中形成有开口(24),并且已经形成了沟槽(26) 形成在层/层堆叠(102-104)中。 根据本发明,通过将抗蚀剂脊(20)暴露于氧等离子体(42)来减小抗蚀剂脊(20)的宽度(51,52)。 结果,可以在硬掩模层(12)和层/层堆叠(102-104)中形成沟槽(26),其中沟槽的宽度(52)小于光刻分辨率极限 抗蚀剂(16)的平版印刷图案化。