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    • 4. 发明公开
    • Nonlithographic method of defining geometries for plasma and/or ion implantation treatments on a semiconductor wafer
    • 定义非光刻工艺来图案化区域的半导体晶片的血浆和/或离子注入处理
    • EP1582922A1
    • 2005-10-05
    • EP04425243.5
    • 2004-04-01
    • STMicroelectronics S.r.l.
    • Alba, SimoneRomeo, Carmelo
    • G03F1/16
    • G03F7/0015G03F1/20H01J2237/0453H01J2237/31788
    • A method of successfully defining (nanometric) geometries for plasma and/or ion implantation treatments of a semiconductor wafer has been found that is decisively more cost effective than the previously known approaches.
      A reusable laminar mask of a material that is mechanically selfsustaining, lithographically definable and dry etchable is fabricated by lithographically defining on a mechanically selfsustaining laminar substrate of a dry etchable material the desired geometries and subsequently dry etching it to produce the desired apertures through the whole thickness of the substrate. After removing the resist mask used for lithographically defining and etching the apertures through the laminar substrate, a layer of a refractory material having a substantial resistance to plasmas is deposited over the surface of the defined and etched laminar substrate that will eventually face toward the plasma or the ion source.
      The so fabricated mask (or mask electrode) is placed in contact or at a relatively small distance that may be comprised between 1 and 5 millimeters, from the surface of an ordinarily supported wafer to be processed and if the mask is held spaced from the surface of the wafer it is preferably coupled to an RF power source.
      Most preferably, the laminar substrate should be electrically conductive because, according to preferred embodiments of this invention, the reusable mask is fed with RF power during use.
      It has been found that it is possible to achieve an outstandingly higher productivity and a decisive cost abatement by avoiding the need of lithographically defining the required geometries on the semiconductor wafer as well as of defining the geometries by direct writing on a resist layer with a focused electron beam (electron brush).