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    • 1. 发明申请
    • Silicon Wafer And Production Method Thereof
    • 硅晶片及其制作方法
    • US20120032229A1
    • 2012-02-09
    • US13191532
    • 2011-07-27
    • Hiroyuki DeaiSeiji Takayama
    • Hiroyuki DeaiSeiji Takayama
    • H01L29/165H01L29/36
    • H01L21/02381H01L21/0245H01L21/02532H01L21/02576H01L21/0262
    • A silicon wafer contains: a silicon substrate; a first epitaxial layer on the silicon wafer, wherein the absolute value of the difference between donor and acceptor concentrations is ≧1×1018 atoms/cm3; a second epitaxial layer above the first epitaxial layer, whose conductivity type is the same as the first epitaxial layer, wherein the absolute value of the difference between donor and acceptor concentrations is ≦5×1017 atoms/cm3; wherein, by doping a lattice constant adjusting material into the first epitaxial layer, the variation amount ((a1-aSi)/aSi) of the lattice constant of the first epitaxial layer (a1) relative to the lattice constant of the silicon single crystal (aSi) as well as the variation amount ((a2-aSi)/aSi) of the lattice constant of the second epitaxial layer (a2) relative to the lattice constant of the silicon single crystal (aSi) are controlled to less than the critical lattice mismatch.
    • 硅晶片包含:硅衬底; 硅晶片上的第一外延层,其中供体和受主浓度之差的绝对值为≥1×1018原子/ cm3; 在第一外延层上方的第二外延层,其导电类型与第一外延层相同,其中供体和受体浓度之差的绝对值为5×1017原子/ cm3; 其中,通过将晶格常数调整材料掺杂到第一外延层中,第一外延层(a1)的晶格常数相对于硅单晶的晶格常数的变化量((a1-aSi)/ aSi) aSi)以及第二外延层(a2)的晶格常数相对于硅单晶(aSi)的晶格常数的变化量((a2-aSi)/ aSi)被控制为小于临界晶格 不匹配。