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    • 4. 发明授权
    • LDD CMOS process
    • LDD CMOS工艺
    • US4753898A
    • 1988-06-28
    • US71002
    • 1987-07-09
    • Louis C. ParrilloStephen S. Poon
    • Louis C. ParrilloStephen S. Poon
    • H01L21/8238H01L27/092H01L21/265
    • H01L21/823864H01L27/0928
    • A process is disclosed for fabricating LDD CMOS structures having a reduced mask count and improved manufacturability. In one embodiment of the invention a CMOS structure is formed having gate insulators overlying N and P type surface regions. Gate electrodes are formed on each of the surface regions and a spacer forming material is deposited over the electrodes and the surface regions. The spacer material is anisotropically etched from one of the surface regions to form spacers at the edge of the first gate electrode while retaining the spacer forming material over the second surface region. Source and drain regions of the first MOS transistor are implanted using the spacers as an implantation mask. The spacers are removed and a lightly doped source and drain is implanted using the gate electrode as a mask. The implanted source and drain regions are oxidized using the remaining spacer forming material as an oxidation mask to prevent oxidation of the second surface region. Devices are then fabricated in that second surface region by implanting devices of opposite conductivity type either with or without the formation of spacers and an LDD structure on the devices of second conductivity type.
    • 公开了一种用于制造具有减小的掩模计数和改进的可制造性的LDD CMOS结构的工艺。 在本发明的一个实施例中,形成了具有覆盖N和P型表面区域的栅极绝缘体的CMOS结构。 在每个表面区域上形成栅电极,并且在电极和表面区域上沉积间隔物形成材料。 间隔物材料从一个表面区域被各向异性地蚀刻,以在第一栅电极的边缘处形成间隔物,同时将间隔物形成材料保持在第二表面区域上。 使用间隔物作为注入掩模注入第一MOS晶体管的源极和漏极区域。 去除间隔物,并使用栅电极作为掩模注入轻掺杂的源极和漏极。 使用剩余的间隔物形成材料作为氧化掩模来氧化注入的源区和漏区,以防止第二表面区的氧化。 然后通过在具有第二导电类型的器件上形成间隔物和LDD结构的情况下注入相反导电类型的器件,在该第二表面区域中制造器件。