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    • 1. 发明授权
    • Process for fabricating a buried, laterally insulated zone of increased conductivity in a semiconductor substrate
    • 用于制造半导体衬底中具有增加的导电性的掩埋横向绝缘区的方法
    • US06551902B1
    • 2003-04-22
    • US09237174
    • 1999-01-25
    • Norbert ElbelZvonimir GabricBernhard Neureither
    • Norbert ElbelZvonimir GabricBernhard Neureither
    • H01L2176
    • H01L21/76224
    • A laterally insulated buried zone of increased conductivity is fabricated in a semiconductor substrate. First, a reference layer is formed on a substrate with a buried zone of increased conductivity. Then the reference layer is patterned. A trench is produced in the substrate, and the insulation material used for filling the trench is applied to the structure thus produced. A planar surface is thereby formed in that the growth rate in the trench is faster than the growth rate on the reference layer adjacent the trench. Here, the reference layer is chosen such that the growth rate of the insulation material on the reference layer is at least a factor of two less than the growth rate of the insulation material on the surface of the trench which is to covered. This trench surface to be covered will usually be composed of substrate material. However, intermediate layers may also be provided.
    • 在半导体衬底中制造增加导电性的横向绝缘掩埋区。 首先,在具有增加的导电性的掩埋区的衬底上形成参考层。 然后将参考层图案化。 在衬底中产生沟槽,并且用于填充沟槽的绝缘材料被施加到由此产生的结构上。 由此形成平坦的表面,因为沟槽中的生长速度快于与沟槽相邻的参考层上的生长速率。 这里,参考层被选择为使得参考层上的绝缘材料的生长速率至少比要覆盖的沟槽表面上的绝缘材料的生长速率小2倍。 待覆盖的沟槽表面通常由基底材料构成。 然而,也可以提供中间层。