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    • 46. 发明授权
    • Method of device isolation using polysilicon pad LOCOS method
    • 使用多晶硅焊盘的器件隔离方法LOCOS方法
    • US5093277A
    • 1992-03-03
    • US487322
    • 1990-03-02
    • Hideaki ArimaNatsuo Ajika
    • Hideaki ArimaNatsuo Ajika
    • H01L21/76H01L21/316H01L21/32H01L21/762
    • H01L21/76227H01L21/32
    • Here is disclosed an improved polysilicon pad LOCOS method. An underlying oxide film is formed on a main surface of a semiconductor substrate. Over the underlying oxide film, polysilicon to be a field oxide film is then deposited. Subsequently, a nitride film is formed on the polysilicon. Thereafter, the nitride film is patterned to leave patterns of a predetermined configuration in an area to be a device region. Using the patterned nitride film as a mask, the polysilicon other than a portion beneath the mask is thermally oxidized to form a field oxide film on the main surface of the semiconductor substrate. The nitride film having served as a mask is then removed to expose the unoxidized polysilicon remaining under the mask. Subsequently, the unoxidized polysilicon is etched away under predetermined conditions which do not allow any etching of the underlying oxide film. According to the present method, it is possible to increase the film thickness of the field oxide film without opening any hole in the surface of the semiconductor substrate. As a result, a highly integrated semiconductor device can be obtained.
    • 这里公开了改进的多晶硅焊盘LOCOS方法。 在半导体衬底的主表面上形成下面的氧化膜。 然后在底层氧化物膜上沉积多晶硅作为场氧化物膜。 随后,在多晶硅上形成氮化物膜。 此后,对氮化膜进行图案化,以便在作为器件区域的区域中留下预定结构的图案。 使用图案化的氮化物膜作为掩模,除了掩模下面的部分之外的多晶硅被热氧化以在半导体衬底的主表面上形成场氧化膜。 用作掩模的氮化物膜然后被去除以暴露残留在掩模下面的未氧化的多晶硅。 随后,在不允许对下面的氧化膜进行任何蚀刻的预定条件下,蚀刻掉未氧化的多晶硅。 根据本方法,可以在半导体衬底的表面中没有打开任何孔的情况下增加场氧化膜的膜厚。 结果,可以获得高度集成的半导体器件。