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    • 94. 发明授权
    • Method and structure for reduction of contact resistance of metal silicides using a metal-germanium alloy
    • 使用金属锗合金降低金属硅化物的接触电阻的方法和结构
    • US06753606B2
    • 2004-06-22
    • US09994954
    • 2001-11-27
    • Cyril Cabral, Jr.Roy Arthur CarruthersJames McKell Edwin HarperChristian LavoieRonnen Andrew RoyYun Yu Wang
    • Cyril Cabral, Jr.Roy Arthur CarruthersJames McKell Edwin HarperChristian LavoieRonnen Andrew RoyYun Yu Wang
    • H01L2348
    • H01L21/28518
    • A method of reducing the contact resistance of metal silicides to the p+ silicon area or the n+ silicon area of the substrate comprising: (a) forming a metal germanium (Ge) layer over a silicon-containing substrate, wherein said metal is selected from the group consisting of Co, Ti, Ni and mixtures thereof; (b) optionally forming an oxygen barrier layer over said metal germanium layer; (c) annealing said metal germanium layer at a temperature which is effective in converting at least a portion thereof into a substantially non-etchable metal silicide layer, while forming a Si—Ge interlayer between said silicon-containing substrate and said substantially non-etchable metal silicide layer; and (d) removing said optional oxygen barrier layer and any remaining alloy layer. When a Co or Ti alloy is employed, e.g., Co—Ge or Ti—Ge, two annealing steps are required to provide the lowest resistance phase of those metals, whereas, when Ni is employed, a single annealing step forms the lowest resistance phase of Ni silicide.
    • 一种降低金属硅化物与衬底的p +硅区域或n +硅区域的接触电阻的方法,包括:(a)在含硅衬底上形成金属锗(Ge)层,其中所述金属选自 由Co,Ti,Ni及其混合物组成的组; (b)任选地在所述金属锗层上形成氧阻隔层; (c)在有效地将其至少一部分转化成基本上不可蚀刻的金属硅化物层的温度下退火所述金属锗层,同时在所述含硅衬底和所述基本上不可蚀刻的衬底之间形成Si-Ge中间层 金属硅化物层; 和(d)去除所述任选的氧气阻挡层和任何剩余的合金层。 当使用Co或Ti合金时,例如Co-Ge或Ti-Ge,需要两个退火步骤来提供这些金属的最低电阻相,而在使用Ni时,单个退火步骤形成最低的电阻相 的Ni硅化物。