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    • 5. 发明授权
    • Nonvolatile semiconductor memory device with twin-well
    • 具有双阱的非易失性半导体存储器件
    • US08008703B2
    • 2011-08-30
    • US12175201
    • 2008-07-17
    • Mitsuhiro NoguchiMinori Kajimoto
    • Mitsuhiro NoguchiMinori Kajimoto
    • H01L29/788
    • H01L27/11546H01L27/105H01L27/11526
    • A nonvolatile semiconductor memory device includes a first well of a first conductivity type, which is formed in a semiconductor substrate of the first conductivity type, a plurality of memory cell transistors that are formed in the first well, a second well of a second conductivity type, which includes a first part that surrounds a side region of the first well and a second part that surrounds a lower region of the first well, and electrically isolates the first well from the semiconductor substrate, and a third well of the second conductivity type, which is formed in the semiconductor substrate. The third well has a less depth than the second part of the second well.
    • 非易失性半导体存储器件包括形成在第一导电类型的半导体衬底中的第一导电类型的第一阱,形成在第一阱中的多个存储单元晶体管,第二导电类型的第二阱 ,其包括围绕第一阱的侧部区域的第一部分和围绕第一阱的下部区域的第二部分,并且将第一阱与半导体衬底以及第二导电类型的第三阱电隔离, 其形成在半导体衬底中。 第三井具有比第二井的第二部分更少的深度。