DRAM trench capacitor and method of fabricating the same
    1.
    发明公开
    DRAM trench capacitor and method of fabricating the same 审中-公开
    Graben-KondensatorfürDRAM und Verfahren zur Herstellung desselben

    公开(公告)号:EP0962972A1

    公开(公告)日:1999-12-08

    申请号:EP99304168.0

    申请日:1999-05-28

    IPC分类号: H01L21/8242

    CPC分类号: H01L27/10861

    摘要: A storage node for deep trench-based storage capacitor is formed by etching a trench (11) in a surface of a semiconductor substrate (10), forming a layer of dielectric (14) on a sidewall of the trench, partially removing the layer of dielectric material in order to expose an upper portion of the sidewall, growing a layer of oxide (16) on the upper portion of the sidewall, removing the remainder of the layer of dielectric material, doping to form a buried plate (17), forming a node dielectric (18), and forming an inner electrode (19) within the trench. The oxide layer at the upper portion of the trench is preferably formed by a LOCOS technique.

    摘要翻译: 通过在半导体衬底(10)的表面上蚀刻沟槽(11)形成用于深沟槽存储电容器的存储节点,在沟槽的侧壁上形成电介质层(14),部分地去除 电介质材料以暴露侧壁的上部,在侧壁的上部生长一层氧化物(16),去除电介质材料层的其余部分,掺杂以形成掩埋板(17),形成 节点电介质(18),并且在所述沟槽内形成内部电极(19)。 沟槽上部的氧化物层优选通过LOCOS技术形成。