Integrated circuit copper metallization process using a lift-off seed
layer and a thick-plated conductor layer
    1.
    发明授权
    Integrated circuit copper metallization process using a lift-off seed layer and a thick-plated conductor layer 失效
    集成电路铜金属化工艺使用剥离种子层和厚镀层导体层

    公开(公告)号:US5316974A

    公开(公告)日:1994-05-31

    申请号:US516637

    申请日:1990-04-30

    Applicant: Sue E. Crank

    Inventor: Sue E. Crank

    CPC classification number: H01L21/4846 H01L21/76838 Y10S438/963

    Abstract: An improved metallized structure (10) is formed from a copper seed layer (46) and a copper structure (48). Semiconductor devices to be connected (16-18) are covered by a conductive barrier layer (20). An oxide layer (28) is then deposited over the barrier layer (20) and patterned using standard photolithographic techniques and an anisotropic plasma etch. Vertical sidewalls (36-38) are formed by the etch and an HF deglaze. A seed layer (44-46) is then sputtered onto a photoresist layer (30) and the exposed barrier layer (20). After stripping the photoresist (30) and the seed layer (44) thereon, the copper structure (48) is electroplated over the remaining seed layer (46). The structure (48) thus formed has approximately vertical sidewalls (24-26) for improved contact with subsequent layers.

    Abstract translation: 改进的金属化结构(10)由铜籽晶层(46)和铜结构(48)形成。 要连接的半导体器件(16-18)被导电阻挡层(20)覆盖。 然后将氧化物层(28)沉积在阻挡层(20)上,并使用标准光刻技术和各向异性等离子体蚀刻进行图案化。 垂直侧壁(36-38)通过蚀刻和HF去潮形成。 然后将种子层(44-46)溅射到光致抗蚀剂层(30)和暴露的阻挡层(20)上。 在剥离光致抗蚀剂(30)和种子层(44)之后,将铜结构(48)电镀在剩余的种子层(46)上。 由此形成的结构(48)具有大致垂直的侧壁(24-26),用于改进与后续层的接触。

    Selective etching of tungsten by remote and in situ plasma generation
    2.
    发明授权
    Selective etching of tungsten by remote and in situ plasma generation 失效
    通过远程和原位等离子体生成选择性蚀刻钨

    公开(公告)号:US4874723A

    公开(公告)日:1989-10-17

    申请号:US74375

    申请日:1987-07-16

    CPC classification number: H01L21/32136 Y10S148/051 Y10S438/963

    Abstract: A thin film etching process, wherein the rate of deposition of a robust sidewall passivant is controlled so that passivants can be continually deposited on the sidewalls of the resist pattern to change the geometry of the resist pattern during the processing step. That is, the existing pattern is modified as if a sidewall filament has been deposited on it, which can be advantageous for many purposes, without the added process complexity required by a sidewall filament process.

    Abstract translation: 薄膜蚀刻工艺,其中控制坚固的侧壁钝化剂的沉积速率,使得钝化剂可以连续沉积在抗蚀剂图案的侧壁上,以在加工步骤期间改变抗蚀剂图案的几何形状。 也就是说,现有的图案被修改,好像侧壁细丝已经沉积在其上,这对于许多目的而言是有利的,而不需要由侧壁细丝工艺所需的附加工艺复杂性。

    Method for etching tungsten
    4.
    发明授权
    Method for etching tungsten 失效
    蚀刻钨的方法

    公开(公告)号:US4849067A

    公开(公告)日:1989-07-18

    申请号:US74411

    申请日:1987-07-16

    CPC classification number: C23F4/00 H01L21/32136

    Abstract: A fluorine based metal etch chemistry, wherein an admixture of etch products (or species which are closely related to etch products) is added during the post etch stage, i.e. during the stage when the pattern has partially cleared by overetch is not yet completed, to maintain the balance of chemistries which provides selectivity and anisotropy. In a tungsten etch, WF.sub.6 is usefully added during the post etch period to provide this loading.

    Abstract translation: 一种氟基金属蚀刻化学,其中在后蚀刻阶段,即在通过过蚀刻部分清除图案尚未完成的阶段期间添加蚀刻产物(或与蚀刻产物密切相关的物质)的混合物,至 维持提供选择性和各向异性的化学物质的平衡。 在钨蚀刻中,在后蚀刻期间有用地加入WF6以提供该负载。

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