3.
    发明专利
    未知

    公开(公告)号:DE10314574B4

    公开(公告)日:2007-06-28

    申请号:DE10314574

    申请日:2003-03-31

    Abstract: Production of a shallow trench insulation structure comprises forming a mask (3) on a substrate (1), forming trenches (2) in the substrate using a mask, selectively depositing a first insulating material (5) to partially fill the trenches with the insulating material in the presence of the mask, and applying a second insulating material (6) on the whole surface of the structure to fill the trenches in the substrate up to the upper side of the mask.

    6.
    发明专利
    未知

    公开(公告)号:DE102004020834A1

    公开(公告)日:2005-11-17

    申请号:DE102004020834

    申请日:2004-04-28

    Abstract: The present invention provides a fabrication method for a semiconductor structure having the steps of providing a semiconductor substrate ( 1 ); providing and patterning a silicon nitride layer ( 3 ) on the semiconductor substrate ( 1 ) as topmost layer of a trench etching mask; forming a trench ( 5 ) in a first etching step by means of the trench etching mask; conformally depositing a liner layer ( 10 ) made of silicon oxide above the resulting structure, which leaves a gap (SP) reaching into the depth in the trench ( 5 ); carrying out a V plasma etching step for forming a V profile of the line layer ( 10 ) in the trench ( 5 ); wherein the liner layer ( 10 ) is pulled back to below the top side of the silicon nitride layer ( 3 ); an etching gas mixture comprises C 5 F 8 , O 2 and an inert gas is used in the V plasma etching step; the ratio (V) of C 5 F 8 /O 2 lies between 2.5 and 3.5; and the selectivity of the V plasma etching step between silicon oxide and silicon nitride is at least 10.

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