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    • 4. 发明授权
    • Method of forming a dopant outdiffusion control structure including
selectively grown silicon nitride in a trench capacitor of a DRAM cell
    • 在DRAM单元的沟槽电容器中形成包括选择性地生长的氮化硅的掺杂剂扩散扩散控制结构的方法
    • US5998253A
    • 1999-12-07
    • US993743
    • 1997-12-19
    • Stephen K. LohChristine DehmChristopher C. Parks
    • Stephen K. LohChristine DehmChristopher C. Parks
    • H01L29/78H01L21/28H01L21/8234H01L21/8238H01L27/088H01L29/49H01L21/70
    • H01L21/8238H01L21/28061H01L29/4916H01L29/4933
    • A method for controlling dopant outdiffusion within an integrated circuit is disclosed. The method includes providing a substrate, forming a trench in the substrate, and forming a first doped layer in the trench. The first doped layer has a first dopant concentration. The method further includes forming a dopant diffusion control structure above the first doped layer. The dopant diffusion control structure includes silicon nitride (Si.sub.x N.sub.y) disposed in grain boundaries of the first doped layer. The method also includes forming a second layer above the dopant diffusion control structure. The second layer has a second dopant concentration lower than the first dopant concentration. Forming the dopant diffusion control structure includes, in one example, forming a first oxide layer over the first doped silicon layer, nitridizing the first oxide layer, thereby forming an oxynitride (SiO.sub.x N.sub.y) layer and causing the silicon nitride to migrate into the grain boundaries, and removing the oxynitride layer, thereby exposing the silicon nitride at the grain boundaries at an interface of the first doped layer.
    • 公开了一种用于控制集成电路内的掺杂物扩散扩散的方法。 该方法包括提供衬底,在衬底中形成沟槽,以及在沟槽中形成第一掺杂层。 第一掺杂层具有第一掺杂浓度。 该方法还包括在第一掺杂层之上形成掺杂剂扩散控制结构。 掺杂剂扩散控制结构包括设置在第一掺杂层的晶界中的氮化硅(SixNy)。 该方法还包括在掺杂剂扩散控制结构上方形成第二层。 第二层具有低于第一掺杂剂浓度的第二掺杂剂浓度。 在一个示例中,形成掺杂剂扩散控制结构包括在第一掺杂硅层上形成第一氧化物层,对第一氧化物层进行氮化,从而形成氧氮化物(SiO x N y)层并使氮化硅迁移到晶界, 并去除氧氮化物层,从而在第一掺杂层的界面处的晶界暴露氮化硅。