Masked sidewall implant for image sensor
    13.
    发明授权
    Masked sidewall implant for image sensor 有权
    用于图像传感器的蒙版侧植入物

    公开(公告)号:US07098067B2

    公开(公告)日:2006-08-29

    申请号:US10905043

    申请日:2004-12-13

    IPC分类号: H01L21/00

    摘要: A novel image sensor structure formed on a substrate of a first conductivity type includes a photosensitive device of a second conductivity type and a surface pinning layer of the first conductivity type. A trench isolation region is formed adjacent to the photosensitive device pinning layer. The structure includes a dopant region comprising material of the first conductivity type formed along a sidewall of the isolation region that is adapted to electrically couple the pinning layer to the substrate. The corresponding method facilitates an angled ion implantation of dopant material in the isolation region sidewall by first fabricating the photoresist layer and reducing its size by removing a corner, or a corner portion thereof, which may block the angled implant material. To facilitate the angled implant to the sidewall edge past resist block masks, two methods are proposed: 1) a spacer type etch of the imaged photoresist; or, 2) a corner sputter process of the imaged photoresist.

    摘要翻译: 形成在第一导电类型的衬底上的新型图像传感器结构包括第二导电类型的光敏器件和第一导电类型的表面钉扎层。 在光敏器件钉扎层附近形成沟槽隔离区。 该结构包括掺杂区域,该掺杂剂区域包括沿着隔离区域的侧壁形成的第一导电类型的材料,其适于将钉扎层电耦合到衬底。 相应的方法通过首先制造光致抗蚀剂层并且通过去除可能阻挡成角度的植入材料的角部或其角部来减小其尺寸来促进掺杂剂材料在隔离区域侧壁中的成角度的离子注入。 为了促进通过抗蚀剂阻挡掩模的侧壁边缘的成角度注入,提出了两种方法:1)成像光致抗蚀剂的间隔物型蚀刻; 或2)成像光致抗蚀剂的角溅射工艺。