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    • 5. 发明授权
    • Method of manufacturing a DRAM and logic device
    • 制造DRAM和逻辑器件的方法
    • US06218235B1
    • 2001-04-17
    • US09542876
    • 2000-04-04
    • Atsushi HachisukaHiroyasu NohsohShinya Soeda
    • Atsushi HachisukaHiroyasu NohsohShinya Soeda
    • H01L218242
    • H01L27/10873H01L27/10894
    • A method of manufacturing a semiconductor device having a memory device and a logic device on the same semiconductor substrate is provided without reducing reliability of the semiconductor device and making a manufacturing process unnecessarily complicated. A silicon oxide film which serves as a salicide protection film in the logic device formation region is subjected to wet isotropic etching. The process completely removes the silicon oxide film in the memory device formation region. Thus, the silicon oxide film is left only in a prescribed portion in the logic device formation region. As a result, the silicon oxide film is not left on an inner wall of a recess formed by a silicon nitride film between gate electrodes. Consequently, a good self alignment contact opening is formed toward a source/drain region in the memory device formation region.
    • 在不降低半导体器件的可靠性并使制造工艺不必要地复杂的情况下,提供具有在同一半导体衬底上的存储器件和逻辑器件的半导体器件的制造方法。 在逻辑器件形成区域中用作硅化物保护膜的氧化硅膜经受湿均匀蚀刻。 该过程完全去除存储器件形成区域中的氧化硅膜。 因此,氧化硅膜仅留在逻辑器件形成区域中的规定部分。 结果,氧化硅膜不留在由栅电极之间的氮化硅膜形成的凹部的内壁上。 因此,存储器件形成区域中的源极/漏极区域形成良好的自对准接触开口。