Control of dopant diffusion from buried layers in bipolar integrated circuits
    3.
    发明申请
    Control of dopant diffusion from buried layers in bipolar integrated circuits 审中-公开
    控制双极集成电路中埋层的掺杂剂扩散

    公开(公告)号:US20050250289A1

    公开(公告)日:2005-11-10

    申请号:US11180457

    申请日:2005-07-13

    摘要: An integrated circuit and method of fabricating the integrated circuit is disclosed. The integrated circuit includes vertical bipolar transistors (30, 50, 60), each having a buried collector region (26′). A carbon-bearing diffusion barrier (28c) is disposed over the buried collector region (26′), to inhibit the diffusion of dopant from the buried collector region (26′) into the overlying epitaxial layer (28). The diffusion barrier (28c) may be formed by incorporating a carbon source into the epitaxial formation of the overlying layer (28), or by ion implantation. In the case of ion implantation of carbon or SiGeC, masks (52, 62) may be used to define the locations of the buried collector regions (26′) that are to receive the carbon; for example, portions underlying eventual collector contacts (33, 44c) may be masked from the carbon implant so that dopant from the buried collector region (26′) can diffuse upward to meet the contact (33). MOS transistors (70, 80) including the diffusion barrier (28) are also disclosed.

    摘要翻译: 公开了一种集成电路及其制造方法。 集成电路包括垂直双极晶体管(30,50,60),每个具有一个埋设集电极区域(26')。 含碳扩散阻挡层(28c)设置在掩埋集电极区域(26')之上,以阻止掺杂剂从掩埋的集电极区域(26')扩散到上覆的外延层(28)中。 扩散阻挡层(28c)可以通过将碳源引入上覆层(28)的外延形成中,或通过离子注入来形成。 在碳或SiGeC的离子注入的情况下,可以使用掩模(52,62)来限定待接收碳的掩埋收集器区域(26')的位置; 例如,最终的集电极触点(33,44c)下面的部分可以从碳注入掩模,使得来自掩埋的集电极区域(26')的掺杂剂可向上扩散以满足触点(33)。 还公开了包括扩散阻挡层(28)的MOS晶体管(70,80)。