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    • 3. 发明申请
    • POLYCRYSTALLINE SILICON MASS AND PROCESS FOR PRODUCING POLYCRYSTALLINE SILICON MASS
    • 用于生产多晶硅质量的多晶硅质量和工艺
    • US20120175613A1
    • 2012-07-12
    • US13496693
    • 2010-07-21
    • Shigeyoshi NetsuJunichi OkadaFumitaka Kume
    • Shigeyoshi NetsuJunichi OkadaFumitaka Kume
    • H01L29/04H01L21/205
    • C01B33/035C01B33/037
    • The present invention provides a clean and high-purity polycrystalline silicon mass having a small content of chromium, iron, nickel, copper, and cobalt in total, which are heavy metal impurities that reduce the quality of single-crystal silicon. In the vicinity of an electrode side end of a polycrystalline silicon rod obtained by the Siemens method, the total of the chromium, iron, nickel, copper, and cobalt concentrations is high. Accordingly, before a crushing step of a polycrystalline silicon rod 100, a removing step of removing at least 70 mm of a polycrystalline silicon portion from the electrode side end of the polycrystalline silicon rod 100 extracted to the outside of a reactor is provided. Thereby, the polycrystalline silicon portion in which the total of the chromium, iron, nickel, copper, and cobalt concentrations in a bulk is not less than 150 ppta can be removed.
    • 本发明提供了一种清洁,高纯度的多晶硅质量体,它们总共含有少量的铬,铁,镍,铜和钴,这是降低单晶硅质量的重金属杂质。 在通过西门子方法获得的多晶硅棒的电极侧端附近,铬,铁,镍,铜和钴的总量高。 因此,在多晶硅棒100的破碎步骤之前,提供从提取到反应器外部的多晶硅棒100的电极侧端部去除至少70mm的多晶硅部分的去除步骤。 因此,可以除去其中大体积中铬,铁,镍,铜和钴的总浓度不低于150ppta的多晶硅部分。