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    • 7. 发明授权
    • Metal oxide field effect transistor with a sharp halo and a method of forming the transistor
    • 具有尖锐光晕的金属氧化物场效应晶体管和形成晶体管的方法
    • US07384835B2
    • 2008-06-10
    • US11420318
    • 2006-05-25
    • Huajie ChenJudson R HoltRangarajan JagannathanWesley C NatzleMichael R SieversRichard S Wise
    • Huajie ChenJudson R HoltRangarajan JagannathanWesley C NatzleMichael R SieversRichard S Wise
    • H01L21/335
    • H01L29/66636H01L29/6659H01L29/7833
    • Disclosed are embodiments of a MOSFET with defined halos that are bound to defined source/drain extensions and a method of forming the MOSFET. A semiconductor layer is etched to form recesses that undercut a gate dielectric layer. A low energy implant forms halos. Then, a COR pre-clean is performed and the recesses are filled by epitaxial deposition. The epi can be in-situ doped or subsequently implanted to form source/drain extensions. Alternatively, the etch is immediately followed by the COR pre-clean, which is followed by epitaxial deposition to fill the recesses. During the epitaxial deposition process, the deposited material is doped to form in-situ doped halos and, then, the dopant is switched to form in-situ doped source/drain extensions adjacent to the halos. Alternatively, after the in-situ doped halos are formed the deposition process is performed without dopants and an implant is used to form source/drain extensions.
    • 公开了具有限定的限定的卤素的MOSFET的实施例,其限定的源极/漏极扩展部分以及形成MOSFET的方法。 蚀刻半导体层以形成切割栅极介电层的凹部。 低能量植入物形成晕轮。 然后,执行COR预清洁,并且通过外延沉积填充凹部。 外延可以被原位掺杂或随后植入以形成源/漏扩展。 或者,蚀刻之后紧接着是COR预清洁,随后进行外延沉积以填充凹部。 在外延沉积工艺期间,沉积的材料被掺杂以形成原位掺杂的光晕,然后切换掺杂剂以形成邻近光晕的原位掺杂的源极/漏极延伸。 或者,在形成原位掺杂的光晕之后,进行沉积工艺而没有掺杂剂,并且使用注入来形成源极/漏极延伸部。