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    • 10. 发明授权
    • Process for fabricating a semiconductor device having deep trench structures
    • 制造具有深沟槽结构的半导体器件的工艺
    • US07402487B2
    • 2008-07-22
    • US10967465
    • 2004-10-18
    • Michael RennieStephen Rusinko
    • Michael RennieStephen Rusinko
    • H01L21/8242
    • H01L27/1087H01L27/10829H01L29/66181
    • A process for fabricating a semiconductor device having deep trench structures includes forming a first portion of the trench in a semiconductor substrate and a second portion of the trench in a selectively-formed upper layer. After etching the substrate to form the first portion of the trench, a protective layer is deposited over the inner surface of the trench in the semiconductor substrate and the upper layer is selectively formed on a principal surface of the semiconductor substrate. During formation of the upper layer, a wall surface is formed in the upper layer that is continuous with the wall surface of the trench in the semiconductor substrate. By forming a second portion of the trench in the selectively-formed upper layer, a deep trench is produced having a high aspect ratio and well defined geometric characteristics.
    • 用于制造具有深沟槽结构的半导体器件的工艺包括在半导体衬底中形成沟槽的第一部分和在选择性形成的上层中形成沟槽的第二部分。 在蚀刻衬底以形成沟槽的第一部分之后,在半导体衬底中的沟槽的内表面上沉积保护层,并且上层选择性地形成在半导体衬底的主表面上。 在形成上层期间,在与半导体衬底中的沟槽的壁表面连续的上层中形成壁表面。 通过在选择性形成的上层中形成沟槽的第二部分,产生具有高纵横比和明确定义的几何特征的深沟槽。