68.
    发明专利
    未知

    公开(公告)号:DE19740904B4

    公开(公告)日:2004-10-28

    申请号:DE19740904

    申请日:1997-09-17

    Abstract: Residual oxygen impurities are eliminated from silicon wafers pulled from a crucible (Czochralski silicon). A multitude of trenches are etched into the back side of the crucible-pulled silicon wafer and the wafer is subsequently heat-treated at about 1100° C. The very large surface area at the front side of the silicon wafer allows oxygen impurities to diffuse out effectively. After the diffusion has been carried out, the trenches are filled with heavily doped polysilicon without leaving gaps.

    69.
    发明专利
    未知

    公开(公告)号:DE59711481D1

    公开(公告)日:2004-05-06

    申请号:DE59711481

    申请日:1997-01-30

    Abstract: The device has a drain zone (1,2) of a first conductivity type and a relatively insulated polycrystalline silicon gate electrode (6), with at least one zone of opposite type incorporated in the drain zone within which a source zone of the first conductivity type is formed. The drain zone incorporates a doped region (15) of the first conductivity type, incorporating a number of zones (16) of the opposite type, with the overall doping of the zones corresponding to the doping of the doped region.The relative spacing of the doped zones is less than the width of the spatial charge zone between the region of first conductivity type and the doped zones.

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