SOI by oxidation of porous silicon
    1.
    发明授权
    SOI by oxidation of porous silicon 失效
    SOI通过多孔硅的氧化

    公开(公告)号:US07566482B2

    公开(公告)日:2009-07-28

    申请号:US10674648

    申请日:2003-09-30

    CPC分类号: H01L21/76245 C25F3/04

    摘要: A method in which a SOI substrate structure is fabricated by oxidation of graded porous Si is provided. The graded porous Si is formed by first implanting a dopant (p- or n-type) into a Si-containing substrate, activating the dopant using an activation anneal step and then anodizing the implanted and activated dopant region in a HF-containing solution. The graded porous Si has a relatively coarse top layer and a fine porous layer that is buried beneath the top layer. Upon a subsequent oxidation step, the fine buried porous layer is converted into a buried oxide, while the coarse top layer coalesces into a solid Si-containing over-layer by surface migration of Si atoms.

    摘要翻译: 提供了通过分级多孔Si的氧化制造SOI衬底结构的方法。 通过首先将掺杂剂(p型或n型)注入到含Si衬底中,使用激活退火步骤激活掺杂剂,然后对含HF溶液中的注入和活化的掺杂剂区进行阳极化,形成渐变多孔Si。 分级多孔Si具有相对粗糙的顶层和埋在顶层下方的细多孔层。 在随后的氧化步骤中,精细埋入的多孔层被转化为掩埋氧化物,而粗顶层通过Si原子的表面迁移而结合成固体含Si的超层。