POWER MOS TRANSISTOR WITH IMPROVED METAL CONTACT
    4.
    发明公开
    POWER MOS TRANSISTOR WITH IMPROVED METAL CONTACT 审中-公开
    具有改进的金属接触功率MOS晶体管

    公开(公告)号:EP2965355A1

    公开(公告)日:2016-01-13

    申请号:EP14709120.1

    申请日:2014-02-24

    IPC分类号: H01L23/522 H01L29/78

    摘要: A power MOS field effect transistor (FET) has a plurality of transistor cells, each cell having a source region and a drain region to be contacted through a surface of a silicon wafer die. A first dielectric layer is disposed on the surface of the silicon wafer die and a plurality of grooves are formed in the first dielectric layer above the source regions and drain regions, respectively and filled with a conductive material. A second dielectric layer is disposed on a surface of the first dielectric layer and has openings to expose contact areas to said grooves. A metal layer is disposed on a surface of the second dielectric layer and filling the openings, wherein the metal layer is patterned and etched to form separate metal wires connecting each drain region and each source region of the plurality of transistor cells, respectively through the grooves.