LOCAL BURIED LAYER FORMING METHOD AND SEMICONDUCTOR DEVICE HAVING SUCH A LAYER
    2.
    发明申请
    LOCAL BURIED LAYER FORMING METHOD AND SEMICONDUCTOR DEVICE HAVING SUCH A LAYER 审中-公开
    具有这种层的局部凸起层形成方法和半导体器件

    公开(公告)号:US20110084356A1

    公开(公告)日:2011-04-14

    申请号:US12995764

    申请日:2009-05-20

    IPC分类号: H01L29/06 H01L21/762

    摘要: The present invention discloses a method of forming a local buried layer (32) in a silicon substrate (10), comprising forming a plurality of trenches (12, 22) in the substrate, including a first trench (22) having a width preventing sealing of the first trench in a silicon migration anneal step and at least one further trench (12) connected to the first trench; exposing the substrate (10) to said anneal step, thereby converting the at least one further trench (12) by means of silicon migration into at least one tunnel (16) accessible via the first trench (22); and forming the local buried layer (32) by filling the at least one tunnel (16) with a material (26, 28, 46) via the first trench (22). Preferably, the method is used to form a semiconductor device having a local buried layer (32) comprising a doped epitaxial silicon plug (26), said plug and the first trench (22) being filled with a material (28) having a higher conductivity than the doped epitaxial silicon (26).

    摘要翻译: 本发明公开了一种在硅衬底(10)中形成局部掩埋层(32)的方法,包括在衬底中形成多个沟槽(12,22),其包括具有宽度防止密封的第一沟槽(22) 的硅迁移退火步骤中的第一沟槽和连接到第一沟槽的至少一个另外的沟槽(12); 将所述衬底(10)暴露于所述退火步骤,由此通过硅迁移将所述至少一个另外的沟槽(12)转换成可经由所述第一沟槽(22)访问的至少一个隧道(16)。 以及通过经由所述第一沟槽(22)用材料(26,28,46)填充所述至少一个隧道(16)来形成所述局部埋层(32)。 优选地,该方法用于形成具有包括掺杂的外延硅插头(26)的局部掩埋层(32)的半导体器件,所述插头和第一沟槽(22)填充有具有较高导电性的材料(28) 比掺杂的外延硅(26)。