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    • 4. 发明申请
    • METHOD FOR FABRICATING MOS TRANSISTOR WITH RECESS CHANNEL
    • 用于制作带有通道的MOS晶体管的方法
    • US20080318388A1
    • 2008-12-25
    • US11955405
    • 2007-12-13
    • Shian-Jyh LinYu-Pi LeeJar-Ming HoShun-Fu ChenTse-Chuan Kuo
    • Shian-Jyh LinYu-Pi LeeJar-Ming HoShun-Fu ChenTse-Chuan Kuo
    • H01L21/20
    • H01L29/66621H01L27/10876H01L27/10879H01L29/66795H01L29/7854
    • A method for fabricating a MOS transistor with a recess channel, including: providing a substrate with a plurality of trench capacitors therein, wherein a trench top oxide is positioned on top of each trench capacitor and extended away from the substrate surface; forming a first spacer on side walls of the trench top oxide; forming a second spacer on the first spacer; defining a plurality of active areas, wherein each of the active areas is parallel with each other and comprises at least two of the trench capacitors; forming an isolation area between each of the active area; etching the substrate of the active area by using the second spacer as a mask to form a trench in the active area; removing the second spacer to expose a portion of the substrate, and etching the exposed substrate to enlarge the trench; and forming a gate structure in the trench.
    • 一种用于制造具有凹槽通道的MOS晶体管的方法,包括:在其中为衬底提供多个沟槽电容器,其中沟槽顶部氧化物位于每个沟槽电容器的顶部并且远离衬底表面延伸; 在所述沟槽顶部氧化物的侧壁上形成第一间隔物; 在所述第一间隔物上形成第二间隔物; 限定多个有效区域,其中每个有源区域彼此平行并且包括至少两个沟槽电容器; 在每个所述活动区域之间形成隔离区域; 通过使用第二间隔件作为掩模蚀刻有源区的衬底,以在有源区中形成沟槽; 去除所述第二间隔物以暴露所述衬底的一部分,并蚀刻所述暴露的衬底以扩大所述沟槽; 并在沟槽中形成栅极结构。