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    • 6. 发明授权
    • Method to reduce MOL damage on NiSi
    • 减少NiSi上MOL损伤的方法
    • US07994038B2
    • 2011-08-09
    • US12366378
    • 2009-02-05
    • Karthik RamaniPaul R. Besser
    • Karthik RamaniPaul R. Besser
    • H01L21/3205
    • H01L21/823807H01L21/28052H01L21/823814H01L21/823835H01L29/458H01L29/665H01L29/6653H01L29/7843
    • Transistor devices are formed with nickel silicide layers formulated to prevent degradation upon removal of overlying stress liners. Embodiments include transistors with nickel silicide layers having a platinum composition gradient increasing in platinum content toward the upper surfaces thereof, i.e., increasing in platinum in a direction away from the gate electrode and source/drain regions. Embodiments include forming a first layer of nickel having a first amount of platinum and forming, on the first layer of nickel, a second layer of nickel having a second amount of platinum, the second weight percent of platinum being greater than the first weight percent. The layers of nickel are then annealed to form a nickel silicide layer having the platinum composition gradient increasing in platinum toward the upper surface. The platinum concentration gradient protects the nickel silicide layer during subsequent processing, as during etching to remove overlying stress liners, thereby avoiding a decrease in device performance.
    • 晶体管器件形成有硅化镍层,配制成防止去除上覆应力衬垫时的退化。 实施方案包括具有镍化硅层的晶体管,其铂组分梯度朝向其上表面增加铂含量,即铂在远离栅电极和源/漏区的方向上增加。 实施例包括形成具有第一量的铂的第一镍层,并在第一层镍上形成具有第二量铂的第二层镍,第二重量百分比的铂大于第一重量百分数。 然后将镍层退火以形成铂化合物梯度朝向上表面逐渐增加的铂硅化镍层。 铂浓度梯度在后续处理期间保护硅化镍层,如在蚀刻期间去除上覆的应力衬垫,从而避免器件性能的降低。