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    • 31. 发明授权
    • Method for dual gate oxide dual workfunction CMOS
    • 双栅氧化双功函数CMOS方法
    • US06087225A
    • 2000-07-11
    • US18939
    • 1998-02-05
    • Gary Bela BronnerBadih El-KarehStanley Everett Schuster
    • Gary Bela BronnerBadih El-KarehStanley Everett Schuster
    • H01L21/8234H01L21/8238H01L21/8242H01L27/088H01L27/10H01L27/108
    • H01L27/10873H01L21/823842
    • A method of forming integrated circuit chips including two dissimilar type NFETs and/or two dissimilar type PFETs on the same chip, such as both thick and thin gate oxide FETs. A DRAM array may be constructed of the thick oxide FETs and logic circuits may be constructed of the thin oxide FETs on the same chip. First, a gate stack including a first, thick gate SiO.sub.2 layer is formed on a wafer. The stack includes a doped polysilicon layer on the gate oxide layer, a silicide layer on the polysilicon layer and a nitride layer on the silicide layer. Part of the stack is selectively removed to re-expose the wafer where logic circuits are to be formed. A thinner gate oxide layer is formed on the re-exposed wafer. Next, gates are formed on the thinner gate oxide layer and thin oxide NFETs and PFETs are formed at the gates. After selectively siliciding thin oxide device regions, gates are etched from the stack in the thick oxide device regions. Finally, source and drain regions are implanted and diffused for the thick gate oxide devices.
    • 在同一芯片上形成包括两个不同类型的NFET和/或两个不同类型的PFET的集成电路芯片的方法,例如厚和薄栅极氧化物FET。 DRAM阵列可以由厚氧化物FET构成,并且逻辑电路可以由同一芯片上的薄氧化物FET构成。 首先,在晶片上形成包括第一厚栅极SiO 2层的栅极堆叠。 堆叠包括栅极氧化物层上的掺杂多晶硅层,多晶硅层上的硅化物层和硅化物层上的氮化物层。 选择性地去除堆叠的一部分以重新暴露将要形成逻辑电路的晶片。 在再曝光的晶片上形成更薄的栅氧化层。 接下来,在较薄的栅极氧化物层上形成栅极,并且在栅极处形成薄氧化物NFET和PFET。 在选择性硅化薄氧化物器件区域之后,在厚氧化物器件区域中从堆叠中蚀刻栅极。 最后,源极和漏极区域被注入并扩散用于厚栅极氧化物器件。