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    • 1. 发明授权
    • Method for achieving very small feature size in semiconductor device by undertaking silicide sidewall growth and etching
    • 通过进行硅化物侧壁生长和蚀刻在半导体器件中实现非常小的特征尺寸的方法
    • US09236448B2
    • 2016-01-12
    • US12231369
    • 2008-09-02
    • Eunha KimMinh-Van Ngo
    • Eunha KimMinh-Van Ngo
    • H01L21/302H01L29/66H01L21/28H01L21/8234
    • H01L29/66659H01L21/2815H01L21/823418H01L21/823437H01L29/6653
    • In the present method of fabricating a semiconductor device, initially, a semiconductor substrate is provided. An oxide layer is provided on and in contact with the substrate, and a polysilicon layer is provided on and in contact with the oxide layer. A layer of photoresist is provided on the polysilicon layer, and the photoresist is patterned to provide a photoresist body, which is used as a mask to etch away polysilicon and oxide, forming a polysilicon element thereunder. The photoresist body is then removed. A nickel layer is provided on the resulting structure, and a reaction step is undertaken to provide that nickel diffuses into the exposed top and side portions of the polysilicon body, forming nickel silicide. After the reaction step, the remaining nickel is removed, and a chemical-mechanical polishing step is undertaken to remove nickel silicide so that a pair of nickel silicide bodies remain, separated by polysilicon. Using the nickel silicide bodies as masks, the polysilicon and oxide thereunder are etched away.
    • 在本发明的制造半导体器件的方法中,首先提供半导体衬底。 氧化物层设置在衬底上并与衬底接触,并且多晶硅层设置在氧化物层上并与氧化物层接触。 在多晶硅层上提供一层光致抗蚀剂,并且将光致抗蚀剂图案化以提供光致抗蚀剂体,其用作掩模以去除多晶硅和氧化物,从而形成其下的多晶硅元件。 然后去除光致抗蚀剂体。 在所得结构上提供镍层,并且进行反应步骤以使镍扩散到多晶硅体的暴露的顶部和侧部,形成硅化镍。 在反应步骤之后,除去剩余的镍,并进行化学机械抛光步骤以除去硅化镍,使得一对硅化镍体保留,被多晶硅分离。 使用硅化镍体作为掩模,其后的多晶硅和氧化物被蚀刻掉。