Bipolar junction transistors (BJTS) with second shallow trench isolation (STI) regions, and methods for forming same
    6.
    发明授权
    Bipolar junction transistors (BJTS) with second shallow trench isolation (STI) regions, and methods for forming same 失效
    具有第二浅沟槽隔离(STI)区域的双极结晶体管(BJTS)及其形成方法

    公开(公告)号:US07342293B2

    公开(公告)日:2008-03-11

    申请号:US11164757

    申请日:2005-12-05

    摘要: The present invention relates to bipolar junction transistors (BJTS). The collector region of each BJT is located in a semiconductor substrate surface and adjacent to a first shallow trench isolation (STI) region. A second STI region is provided, which extends between the first STI region and the collection region and undercuts a portion of the active base region with an undercut angle of not more than about 90°. For example, the second STI region may a substantially triangular cross-section with an undercut angle of less than about 90°, or a substantially rectangular cross-section with an undercut angle of about 90°. Such a second STI region can be fabricated using a porous surface section formed in an upper surface of the collector region.

    摘要翻译: 本发明涉及双极结型晶体管(BJTS)。 每个BJT的集电极区域位于半导体衬底表面中并且邻近第一浅沟槽隔离(STI)区域。 提供了第二STI区域,其在第一STI区域和收集区域之间延伸,并且底切角度不大于约90°的一部分活性基底区域。 例如,第二STI区域可以具有小于约90°的底切角的基本上为三角形的横截面,或者具有约90°的底切角的基本上矩形的横截面。 可以使用形成在集电区域的上表面中的多孔表面部分来制造这样的第二STI区域。