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    • 6. 发明授权
    • Forming minimal size spaces in integrated circuit conductive lines
    • 在集成电路导线中形成最小尺寸空间
    • US5930659A
    • 1999-07-27
    • US986098
    • 1997-12-05
    • Richard K. KleinAsim A. SelcukNicholas J. KeplerChristopher A. SpenceRaymond T. LeeJohn C. HolstStephen C. Horne
    • Richard K. KleinAsim A. SelcukNicholas J. KeplerChristopher A. SpenceRaymond T. LeeJohn C. HolstStephen C. Horne
    • H01L21/321H01L21/768H01L21/3205H01L21/324
    • H01L21/76888H01L21/32105H01L21/76838
    • A method of forming minimal gaps or spaces in a polysilicon conductive lines pattern for increasing the density of integrated circuits by converting an area of the size of the desired gap or space in the polysilicon to silicon oxide, followed by removing the silicon oxide. The preferred method is to selectively ion implant oxygen into the polysilicon and annealing to convert the oxygen implanted polysilicon to silicon oxide. As an alternative method, an opening in an insulating layer overlying the conductive line is first formed by conventional optical lithography, followed by forming sidewalls in the opening to create a reduced opening and using the sidewalls as a mask to blanket implant oxygen through the reduced opening and into the exposed polysilicon conductive line. After annealing, the implanted polysilicon converted to silicon oxide and removed to form a gap or space in the polysilicon conductive line pattern substantially equal in size to the reduced opening. Instead of blanket implanting with oxygen, thermal oxidation can be used to convert the exposed polysilicon to silicon oxide.
    • 通过将多晶硅中期望的间隙或空间的大小的面积转换为氧化硅,然后除去氧化硅,形成多晶硅导电线图形中的最小间隙或间隔的方法,以增加集成电路的密度。 优选的方法是选择性地将氧注入到多晶硅中并进行退火以将氧注入的多晶硅转化为氧化硅。 作为替代方法,首先通过常规光学光刻形成覆盖在导电线上的绝缘层中的开口,随后在开口中形成侧壁以形成减小的开口,并且使用侧壁作为掩模,以通过缩小开口来覆盖氧气注入氧气 并进入暴露的多晶硅导电线。 在退火之后,注入的多晶硅转变成氧化硅并去除,以在多晶硅导电线图案中形成与缩小的开口大致相等的间隙或空间。 代替用氧气进行全面注入,可以使用热氧化来将暴露的多晶硅转化为氧化硅。