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    • 3. 发明申请
    • Low Temperature Etching of Silicon Nitride Structures Using Phosphoric Acid Solutions
    • 使用磷酸溶液的氮化硅结构的低温蚀刻
    • US20140011367A1
    • 2014-01-09
    • US13541397
    • 2012-07-03
    • Gregory NowlingJohn Foster
    • Gregory NowlingJohn Foster
    • H01L21/306
    • H01L21/31111H01L21/67086H01L29/6653
    • Provided are methods for processing semiconductor substrates. The methods involve etching silicon nitride structures using phosphoric acid solutions maintained at low temperatures, such as between about 110° C. and 130° C. These temperatures provide adequate etching rates and do not damage surrounding metal silicide and silicon oxide structures. The etching rates of silicon nitride may be 10 Angstroms per minute and greater. Lower temperatures also allow decreasing concentrations of phosphoric acid in the etching solutions, which in some embodiments may be less than 90 weight percent. As a result, more selective etching of the silicon nitride structures may be achieved. This selectivity may be as high as hundred times relative to the silicide and silicon oxide structures. The surface conductivity of the silicide structures may remain substantially unchanged by this etching process.
    • 提供了用于处理半导体衬底的方法。 该方法包括使用保持在低温(例如约110℃至130℃)之间的磷酸溶液来蚀刻氮化硅结构。这些温度提供足够的蚀刻速率,并且不会损坏周围的金属硅化物和氧化硅结构。 氮化硅的蚀刻速率可以为每分钟10埃或更高。 较低的温度也允许蚀刻溶液中磷酸的浓度降低,在一些实施方案中磷酸的浓度可以小于90重量%。 结果,可以实现对氮化硅结构的更多的选择性蚀刻。 相对于硅化物和氧化硅结构,该选择性可高达百倍。 通过该蚀刻工艺,硅化物结构的表面电导率可以保持基本不变。
    • 4. 发明授权
    • Low temperature etching of silicon nitride structures using phosphoric acid solutions
    • 使用磷酸溶液对氮化硅结构进行低温蚀刻
    • US08716146B2
    • 2014-05-06
    • US13541397
    • 2012-07-03
    • Gregory NowlingJohn Foster
    • Gregory NowlingJohn Foster
    • H01L21/302
    • H01L21/31111H01L21/67086H01L29/6653
    • Provided are methods for processing semiconductor substrates. The methods involve etching silicon nitride structures using phosphoric acid solutions maintained at low temperatures, such as between about 110° C. and 130° C. These temperatures provide adequate etching rates and do not damage surrounding metal silicide and silicon oxide structures. The etching rates of silicon nitride may be 10 Angstroms per minute and greater. Lower temperatures also allow decreasing concentrations of phosphoric acid in the etching solutions, which in some embodiments may be less than 90 weight percent. As a result, more selective etching of the silicon nitride structures may be achieved. This selectivity may be as high as hundred times relative to the silicide and silicon oxide structures. The surface conductivity of the silicide structures may remain substantially unchanged by this etching process.
    • 提供了用于处理半导体衬底的方法。 该方法包括使用保持在低温(例如约110℃至130℃)之间的磷酸溶液来蚀刻氮化硅结构。这些温度提供足够的蚀刻速率,并且不会损坏周围的金属硅化物和氧化硅结构。 氮化硅的蚀刻速率可以为每分钟10埃或更高。 较低的温度也允许蚀刻溶液中磷酸的浓度降低,在一些实施方案中磷酸的浓度可以小于90重量%。 结果,可以实现对氮化硅结构的更多的选择性蚀刻。 相对于硅化物和氧化硅结构,该选择性可高达百倍。 通过该蚀刻工艺,硅化物结构的表面电导率可以保持基本不变。