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    • 10. 发明授权
    • Method of manufacturing semiconductor device and methods of processing,
analyzing and manufacturing its substrate
    • 半导体器件的制造方法及其衬底的加工,分析和制造方法
    • US6037270A
    • 2000-03-14
    • US496677
    • 1995-06-29
    • Mokuji KageyamaMoriya Miyashita
    • Mokuji KageyamaMoriya Miyashita
    • H01L21/316H01L21/26H01L21/306H01L21/311H01L21/66C23F1/24C23F1/10
    • H01L21/31111H01L21/02052H01L22/12
    • The gate oxide film is prevented from being thinned partially. The semiconductor substrate (wafer) can be etched (processed) under excellent conditions. The impurities on the wafer surface can be analyzed and further reduced. In the first aspect, the substrate is irradiated with ultraviolet rays in contact with an F-containing aqueous solution, so that the oxide film and the substrate can be etched at roughly the same etching speed under excellent controllability without deteriorating the planarization of the substrate. In the second aspect, the substrate is etched by irradiating ultraviolet rays during exposure to an acid aqueous solution, so that surface metallic contamination and particles can be removed without deteriorating the wafer surface roughness. Further, the impurity elements in the outermost surface layer of the wafer can be analyzed at high precision by analyzing elements contained in the acid aqueous solution used for the etching. According to the third aspect, holes and electrons are recombined in the polycrystal silicon during irradiation of the ultraviolet rays, and metallic impurities are dissolved into the aqueous solution as ions, so that metallic impurities in the polycrystal silicon can be reduced.
    • 防止栅极氧化膜部分变薄。 可以在优异的条件下对半导体衬底(晶片)进行蚀刻(处理)。 可以分析晶圆表面上的杂质并进一步减少。 在第一方面中,用与含F水溶液接触的紫外线照射基板,从而可以在优异的可控性下以大致相同的蚀刻速度蚀刻氧化膜和基板,而不会劣化基板的平坦化。 在第二方面中,通过在暴露于酸性水溶液时照射紫外线来蚀刻基板,从而可以除去表面金属污染物和颗粒,而不会降低晶片表面粗糙度。 此外,通过分析用于蚀刻的酸性水溶液中所含的元素,可以高精度地分析晶片的最外表面层中的杂质元素。 根据第三方面,在紫外线照射期间,多晶硅中的空穴和电子被重新结合,并且金属杂质作为离子溶解在水溶液中,从而可以减少多晶硅中的金属杂质。