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    • 5. 发明申请
    • NONVOLATILE SEMICONDUCTOR STORAGE DEVICE
    • 非易失性半导体存储器件
    • US20120205735A1
    • 2012-08-16
    • US13404073
    • 2012-02-24
    • Naoki YASUDAJun Fujiki
    • Naoki YASUDAJun Fujiki
    • H01L27/115
    • H01L21/28282H01L27/1157H01L29/66833H01L29/792
    • In one embodiment, there is provided a nonvolatile semiconductor storage device. The device includes: a plurality of nonvolatile memory cells. Each of the nonvolatile memory cells includes: a first semiconductor layer including a first source region, a first drain region, and a first channel region; a block insulating film formed on the first channel region; a charge storage layer formed on the block insulating film; a tunnel insulating film formed on the charge storage layer; a second semiconductor layer formed on the tunnel insulating film and including a second source region, a second drain region, and a second channel region. The second channel region is formed on the tunnel insulating film such that the tunnel insulating film is located between the second source region and the second drain region. A dopant impurity concentration of the first channel region is higher than that of the second channel region.
    • 在一个实施例中,提供了一种非易失性半导体存储装置。 该装置包括:多个非易失性存储单元。 每个非易失性存储单元包括:第一半导体层,包括第一源极区,第一漏极区和第一沟道区; 形成在所述第一沟道区上的块绝缘膜; 形成在所述块绝缘膜上的电荷存储层; 形成在电荷存储层上的隧道绝缘膜; 形成在所述隧道绝缘膜上并且包括第二源极区域,第二漏极区域和第二沟道区域的第二半导体层。 第二沟道区形成在隧道绝缘膜上,使得隧道绝缘膜位于第二源区和第二漏区之间。 第一沟道区的掺杂剂杂质浓度高于第二沟道区的掺杂剂杂质浓度。