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    • 82. 发明授权
    • Method for a controlled bottle trench for a dram storage node
    • 一种用于剧烈储存节点的受控瓶沟的方法
    • US06190988B1
    • 2001-02-20
    • US09086174
    • 1998-05-28
    • Toshiharu FurukawaMark C. HakeySteven J. HolmesDavid HorakWilliam H. MaJames M. Never
    • Toshiharu FurukawaMark C. HakeySteven J. HolmesDavid HorakWilliam H. MaJames M. Never
    • H01L2120
    • H01L27/1087
    • A bottle-shaped trench capacitor with a buried plate is formed in a controlled etch process. The bottle-shape is fabricated by etching deep trenches from a layered substrate, using the layers as a mask, and covering the side walls of the substrate with protective oxide and nitride layers. With the side walls covered, deep trench etching is then resumed, and a lower trench portion, below the protective layers of the side wall are formed. By diffusing a first dopant in the lower portion of the deep trench region, using the side wall protective layers as a mask, an etch stop is established for a wet etch process at the p/n junction established by the first dopant. The width of the lower trench portion is regulated by the time and temperature of the diffusion. Removing the doped material and applying a second dopant to the lower trench portion establishes a continuous buried plate region between trenches. A capacitor is formed by applying an insulating layer to the trench and filling with a conductor.
    • 在受控蚀刻工艺中形成具有掩埋板的瓶形沟槽电容器。 通过使用这些层作为掩模蚀刻来自分层衬底的深沟槽,并用保护的氧化物和氮化物层覆盖衬底的侧壁来制造瓶形。 在侧壁被覆盖的情况下,然后恢复深沟槽蚀刻,并且形成在侧壁的保护层下方的下沟槽部分。 通过在深沟槽区域的下部扩散第一掺杂剂,使用侧壁保护层作为掩模,建立了在由第一掺杂剂建立的p / n结处的湿蚀刻工艺的蚀刻停止。 下沟槽部分的宽度由扩散的时间和温度来调节。 去除掺杂材料并向下沟槽部分施加第二掺杂剂在沟槽之间建立连续的掩埋板区域。 通过向沟槽施加绝缘层并填充导体来形成电容器。