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    • 37. 发明授权
    • Selective removal of tantalum-containing barrier layer during metal CMP
    • 在金属CMP期间选择性去除含钽阻挡层
    • US06858540B2
    • 2005-02-22
    • US10215521
    • 2002-08-08
    • Lizhong SunStan TsaiShijian LiFred C. Redeker
    • Lizhong SunStan TsaiShijian LiFred C. Redeker
    • B24B1/00C09K13/00C11D1/00H01L21/285H01L21/302H01L21/321H01L21/768
    • H01L21/3212H01L21/28568H01L21/7684
    • A method for performing chemical-mechanical polishing/planarization providing highly selective, rapid removal of a Ta-containing barrier layer from a workpiece surface, such as a semiconductor wafer including a damascene-type Cu-based metallization pattern in-laid in a dielectric layer and including a Ta-containing metal diffusion barrier layer, comprises applying an aqueous liquid composition to the workpiece surface during CMP or to the polishing pad utilized for performing the CMP, the composition comprising at least one reducing agent for reducing transition metal ions to a lower valence state, at least one pH adjusting agent, at least one metal corrosion inhibitor, and water, and optionally includes ions of at least one transition metal, e.g., Cu and Fe ions. According to another embodiment, the aqueous liquid composition contains Ag ions and the at least one reducing agent is omitted.
    • 一种用于进行化学机械抛光/平面化的方法,其提供从工件表面高度选择性地快速去除含Ta阻挡层,例如包括嵌入在介电层中的镶嵌型Cu基金属化图案的半导体晶片 并且包括含Ta的金属扩散阻挡层,包括在CMP期间将水性液体组合物施加到工件表面或用于执行CMP的抛光垫,所述组合物包含至少一种还原剂以将过渡金属离子还原成低级 价态,至少一种pH调节剂,至少一种金属腐蚀抑制剂和水,并且任选地包括至少一种过渡金属(例如Cu和Fe离子)的离子。 根据另一个实施方案,含水液体组合物含有Ag离子,并且省略了至少一种还原剂。