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    • 7. 发明授权
    • Method of increasing the etch selectivity of a contact sidewall to a preclean etchant
    • 将接触侧壁的蚀刻选择性增加到预清洗蚀刻剂的方法
    • US06677247B2
    • 2004-01-13
    • US10041550
    • 2002-01-07
    • Zheng YuanSteve GhanayemRandhir P. S. Thakur
    • Zheng YuanSteve GhanayemRandhir P. S. Thakur
    • H01L2100
    • H01L21/76814C03C15/00H01L21/02043H01L21/02046H01L21/02063H01L21/31116H01L21/76826H01L21/76831
    • A method of forming a contact in an integrated circuit between a first metalization layer and a silicon substrate. In one embodiment the method comprises forming a premetal dielectric layer over the silicon substrate, etching a contact hole through the premetal dielectric layer and then forming a thin silicon nitride layer on an outer surface of the contact hole. The silicon nitride layer reduces overetching that may otherwise occur when oxidation build-up is removed from the silicon interface within the contact hole by a preclean process. After the preclean process, the contact hole is then filled with one or more conductive materials. In various embodiments the silicon nitride layer is formed by exposing the contact hole to a nitrogen plasma, depositing the layer by a chemical vapor deposition process and depositing the layer by an atomic layer deposition process. In other embodiments, the method is applicable to the formation of vias through intermetal dielectric layers.
    • 一种在第一金属化层和硅衬底之间的集成电路中形成接触的方法。 在一个实施例中,该方法包括在硅衬底上形成前金属介电层,蚀刻通过前金属介电层的接触孔,然后在接触孔的外表面上形成薄的氮化硅层。 氮化硅层减少过蚀刻,否则当通过预清洗工艺从接触孔中的硅界面除去氧化积聚时,可能会发生过蚀刻。 在预清洗工艺之后,接触孔然后用一种或多种导电材料填充。 在各种实施例中,通过将接触孔暴露于氮等离子体,通过化学气相沉积工艺沉积该层并通过原子层沉积工艺沉积该层来形成氮化硅层。 在其它实施例中,该方法适用于通过金属间电介质层形成通孔。