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    • 1. 发明申请
    • シリコンエピタキシャルウェーハの製造方法
    • 制造硅外延层的方法
    • WO2006022127A1
    • 2006-03-02
    • PCT/JP2005/014175
    • 2005-08-03
    • 信越半導体株式会社久米 史高吉田 知佐相原 健星 亮二戸部 敏視戸田 尚久田原 史夫
    • 久米 史高吉田 知佐相原 健星 亮二戸部 敏視戸田 尚久田原 史夫
    • H01L21/322H01L21/308
    • H01L21/02052H01L21/3225
    • A silicon single crystal substrate (1) is manufactured by CZ method and is doped with boron to have a resistivity of 0.02 O·cm or less. On the silicon single crystal substrate, a silicon epitaxial layer (2) is vapor-phase grown, and low-temperature heat treatment is performed in an oxidizing atmosphere at a temperature of 450°C or higher but not higher than 750°C for a time that permits the thickness (t1) of a silicon oxide film (3) formed on the silicon epitaxial layer (2) to be 2nm or less, and an oxygen precipitation nucleus (11) is formed in the silicon single crystal substrate (1). Then, the silicon oxide film (3) formed by first cleaning after the low-temperature heat treatment is etched by a cleaning solution composed of a mixed solution of ammonia, hydrogen peroxide and water. Thus, the final thickness of the remaining silicon oxide film formed during heat treatment in the oxidizing atmosphere for forming the oxygen precipitation nucleus can be kept at a level of a native oxide even without employing fluorinated acid cleaning, and furthermore, particle increase after the cleaning can be suppressed.
    • 硅单晶衬底(1)通过CZ法制造,并掺杂有电阻率为0.02O·cm以下的硼。 在硅单晶衬底上,气相生长硅衬底(2),在氧化气氛中,在450℃以上但不高于750℃的温度下进行低温热处理 在硅单晶衬底(1)中形成允许形成在硅外延层(2)上的氧化硅膜(3)的厚度(t1)为2nm以下的氧析出核(11)的时间, 。 然后,通过由氨,过氧化氢和水的混合溶液构成的清洗溶液来蚀刻在低温热处理之后通过第一次清洗形成的氧化硅膜(3)。 因此,即使不使用氟化酸清洗,在用于形成氧沉淀核的氧化气氛中的热处理期间形成的剩余氧化硅膜的最终厚度也可以保持在天然氧化物的水平,此外,清洁后颗粒增加 可以抑制。