Working method for single crystal alumina
    22.
    发明专利

    公开(公告)号:JP2004203675A

    公开(公告)日:2004-07-22

    申请号:JP2002374717

    申请日:2002-12-25

    Abstract: PROBLEM TO BE SOLVED: To provide a working method for single crystal alumina whereby objective deep unevenness or the like can be formed on the surface of single crystal alumina.
    SOLUTION: The working method comprises the step of forming an etching mask comprising a nitrogen-containing compound on the surface of single crystal alumina and the step of subjecting the single crystal alumina to reactive ion etching with a plasma containing boron and chlorine by using the etching mask.
    COPYRIGHT: (C)2004,JPO&NCIPI

    NON-CRYSTALLINE CARBON REMOVING METHOD

    公开(公告)号:JP2002167207A

    公开(公告)日:2002-06-11

    申请号:JP2000360767

    申请日:2000-11-28

    Applicant: SONY CORP

    Abstract: PROBLEM TO BE SOLVED: To remove non-crystalline carbon. SOLUTION: A substrate 1, in which crystalline carbon is formed on a catalytic metal, is placed inside of a reaction tube 2 equipped with a vacuum pump 3 for exhaust. Oxygen is supplied from a gas source 4 into the reaction tube 2, and a mixed gas is plasma gasified by a microwave from a microwave generator 5. Non-crystalline carbon, formed on the substrate 1 during crystalline carbon is formed, is made ashing by plasma gasified oxygen and removed selectively.

    CRYSTAL DEFECT DETECTING METHOD FOR SILICON WAFER, CRYSTAL DEFECT EVALUATING METHOD, AND OXIDE FILM BREAKDOWN VOLTAGE CHARACTERISTICS EVALUATING METHOD

    公开(公告)号:JP2000269288A

    公开(公告)日:2000-09-29

    申请号:JP6888599

    申请日:1999-03-15

    Abstract: PROBLEM TO BE SOLVED: To detect a crystal defect affecting the oxide film breakdown voltage and secular dielectric breakdown characteristics of a silicon wafer, to simplify a measuring method, to improve and simplify evaluating method for oxide film breakdown strength and secular dielectric breakdown characteristics, and to significantly shorten a measurement time while a cost is reduced. SOLUTION: This is related to a crystal defect detecting method for a wafer wherein a thermal process is performed for forming a thermally oxidized film on the surface of a silicon wafer before thermally treated in the atmosphere containing hydrogen, so that the crystal defect in the silicon wafer is generated as a pit on the thermally oxidized film. In an oxide film breakdown voltage characteristics evaluating method for a silicon wafer, these are measured with a particle counter and the oxide film breakdown voltage characteristics of the silicon wafer is evaluated from the total number of pits of 0.15 μm or larger in size.

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