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    • 1. 发明授权
    • Semiconductor memory device including improved connection structure to
FET elements
    • 半导体存储器件包括改进的与FET元件的连接结构
    • US5428235A
    • 1995-06-27
    • US300878
    • 1994-09-06
    • Masahiro ShimizuTakehisa YamaguchiNatsuo Ajika
    • Masahiro ShimizuTakehisa YamaguchiNatsuo Ajika
    • H01L27/108H01L29/68
    • H01L27/10808
    • A memory cell of a DRAM comprises one MOS transistor and one capacitor. The MOS transistor includes a pair of source/drain regions and a gate electrode formed on the channel region. A bit line is formed so as to be connected to the source/drain region. A conductive layer is formed so as to be connected to the source/drain region. The gate electrode includes a first part formed on the channel region with an oxide film interposedand second and third parts extending from the first part, respectively, and formed on the bit line and the conductive layer with an interlayer oxide film interposed. The capacitor includes a lower electrode formed so as to be connected to the conductive layer and an upper electrode formed so as to be opposed to the surface of the lower electrode with a dielectric film interposed. The upper electrode is placed above the bit line. A word line is placed above the upper electrode and connected to the gate electrode. It is possible to provide a field effect transistor in which increase in speed can be realized and to provide a semiconductor memory device in which capacitance of the capacitor can be sufficiently secured in case of making miniaturization of the memory cell. It is also possible to prevent decrease in reliability caused by disconnection of the bit line.
    • DRAM的存储单元包括一个MOS晶体管和一个电容器。 MOS晶体管包括一对源极/漏极区域和形成在沟道区域上的栅极电极。 形成位线以便连接到源极/漏极区域。 导电层形成为连接到源/漏区。 栅电极包括形成在沟道区上的第一部分,其中介于氧化膜之间,第二和第三部分分别从第一部分延伸并且形成在位线上,并且导电层被插入夹层氧化膜。 电容器包括形成为连接到导电层的下电极和形成为与介电膜插入的下电极的表面相对的上电极。 上电极位于位线上方。 字线放置在上电极上方并连接到栅电极。 可以提供一种可以实现速度增加的场效应晶体管,并且提供一种在使存储单元小型化的情况下能够充分确保电容器的电容的半导体存储器件。 也可以防止由位线的断线引起的可靠性降低。