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    • 5. 发明授权
    • Semiconductor integrated circuit device including memory cells having a
structure effective in suppression of leak current
    • 包括具有抑制漏电流的结构的存储单元的半导体集成电路器件
    • US5349218A
    • 1994-09-20
    • US875653
    • 1992-04-29
    • Yoshitaka TadakiToshihiro SekiguchiHiroyuki UchiyamaToru KagaJun MurataOsaomi Enomoto
    • Yoshitaka TadakiToshihiro SekiguchiHiroyuki UchiyamaToru KagaJun MurataOsaomi Enomoto
    • H01L27/04H01L21/822H01L21/8242H01L27/10H01L27/108H01L29/78
    • H01L27/10829
    • A semiconductor integrated circuit device has a semiconductor memory cell array including word lines, data lines and a plurality of memory cells provided at cross points of the word and data lines. Each memory cell has a cell selection transistor and an information storage capacitor connected in series. The cell selection transistor in one cell includes first and second doped regions formed in a main surface of a semiconductor substrate, a first insulating film formed on the main surface between the first and second doped regions and a control electrode layer formed on the first insulating film between the first and second doped regions. The first doped region is connected with a data line, while the control electrode is connected with a word line. The information storage capacitor includes a second insulating film formed on the wall of one trench formed on the main surface of the substrate, an electrode layer formed on the second insulating film and serving as a first electrode of the capacitor, a dielectric film formed on the electrode layer and a conducting material provided to fill a space defined by the dielectric film in the trench and serving as a second electrode of the capacitor. The second doped region of the transistor terminates at the wall of the trench. A conducting layer is provided to extend both on the second doped region and the conducting material in the cell to electrically interconnect them for the series connection.
    • 半导体集成电路器件具有半导体存储单元阵列,该半导体存储单元阵列包括在字和数据线的交叉点处设置的字线,数据线和多个存储单元。 每个存储单元具有串联连接的单元选择晶体管和信息存储电容器。 一个单元中的单元选择晶体管包括形成在半导体衬底的主表面中的第一和第二掺杂区,形成在第一和第二掺杂区之间的主表面上的第一绝缘膜和形成在第一绝缘膜上的控制电极层 在第一和第二掺杂区域之间。 第一掺杂区域与数据线连接,而控制电极与字线连接。 信息存储电容器包括形成在形成在基板的主表面上的一个沟槽的壁上的第二绝缘膜,形成在第二绝缘膜上并用作电容器的第一电极的电极层,形成在第二绝缘膜上的电介质膜 电极层和设置成填充由沟槽中的电介质膜限定的空间并用作电容器的第二电极的导电材料。 晶体管的第二掺杂区域终止于沟槽的壁。 提供导电层以在第二掺杂区域和电池中的导电材料两者上延伸以将它们互连用于串联连接。