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    • 9. 发明公开
    • SEMICONDUCTOR ELEMENT AND MANUFACTURING METHOD THEREFOR
    • HALBLEITERELEMENT UND HERSTELLUNGSVERFAHRENDAFÜR
    • EP2620983A4
    • 2013-08-28
    • EP11835849
    • 2011-10-27
    • PANASONIC CORP
    • UCHIDA MASAOTANAKA KOUTAROU
    • H01L29/78H01L21/336H01L29/06H01L29/12
    • H01L21/26506H01L21/046H01L29/1608H01L29/66068H01L29/7828
    • A semiconductor element according to the present invention includes: a semiconductor substrate of a first conductivity type; a first silicon carbide semiconductor layer of the first conductivity type on the semiconductor substrate; a body region of a second conductivity type defined in the first silicon carbide semiconductor layer; an impurity region of the first conductivity type defined in the body region; a second silicon carbide semiconductor layer of the first conductivity type on the first silicon carbide semiconductor layer; a gate insulating film on the second silicon carbide semiconductor layer; a gate electrode on the gate insulating film; a first ohmic electrode connected to the impurity region ; and a second ohmic electrode on the back surface of the semiconductor substrate. The body region includes first and second body regions. The average impurity concentration of the first body region is twice or more as high as that of the second body region. And the bottom of the impurity region is deeper than that of the first body region.
    • 根据本发明的半导体元件包括:第一导电类型的半导体衬底; 在半导体衬底上的第一导电类型的第一碳化硅半导体层; 在第一碳化硅半导体层中限定的第二导电类型的体区; 在主体区域中限定的第一导电类型的杂质区域; 在第一碳化硅半导体层上的第一导电类型的第二碳化硅半导体层; 在第二碳化硅半导体层上的栅极绝缘膜; 栅绝缘膜上的栅电极; 连接到杂质区的第一欧姆电极; 以及在半导体衬底的背面上的第二欧姆电极。 身体区域包括第一和第二身体区域。 第一体区的平均杂质浓度是第二体区的平均杂质浓度的两倍或更多。 杂质区域的底部比第一体区域的底部深。