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    • 6. 发明授权
    • Dynamic random access memory device and method of manufacturing
    • 动态随机存取存储器件及其制造方法
    • US5218217A
    • 1993-06-08
    • US568567
    • 1990-08-16
    • Hidekazu OdaKiyoteru KobayashiTakehisa Yamaguchi
    • Hidekazu OdaKiyoteru KobayashiTakehisa Yamaguchi
    • H01L27/10H01L21/8242H01L27/108H01L29/786
    • H01L27/10802H01L27/10805H01L29/78654
    • Each memory cell of a dynamic random access memory comprises a semiconductor layer of a first conductivity type, one and the other impurity regions of a second conductivity type, a gate electrode, a capacitor impurity region of the first conductivity type, and a capacitor electrode. The semiconductor layer of the first conductivity type comprises a first surface and a second surface located opposite to the first surface. One and the other impurity regions are formed spaced apart from each other in the semiconductor layer so as to define a channel region with a channel surface being a part of the first surface of the semiconductor layer. The gate electrode is formed on the channel surface through a gate insulating film. The capacitor impurity region is formed opposing to the channel region, near the second surface of the semiconductor layer and having a concentration higher than that of the semiconductor layer. The capacitor electrode is formed on the capacitor impurity region through a dielectric film. Reduced surface area occupied by each memory cell comprising a field effect transistor and a capacitor enables miniaturization of the memory cell. Electric charges generated by the impact ionization phenomenon are stored in the capacitor, so that a power consumed in a writing operation of data can be reduced.
    • 动态随机存取存储器的每个存储单元包括第一导电类型的半导体层,第二导电类型的一个和另一个杂质区,第一导电类型的栅电极,电容器杂质区和电容器电极。 第一导电类型的半导体层包括第一表面和与第一表面相对的第二表面。 在半导体层中形成彼此间隔开的一个和其它杂质区,以便限定沟道区,其中沟道表面是半导体层的第一表面的一部分。 栅电极通过栅极绝缘膜形成在沟道表面上。 在半导体层的第二表面附近形成与沟道区相对的电容器杂质区,其浓度高于半导体层的浓度。 电容器电极通过电介质膜形成在电容器杂质区上。 由包括场效应晶体管和电容器的每个存储单元占用的减小的表面积使得能够使存储单元小型化。 由电击现象产生的电荷存储在电容器中,从而可以减少数据写入操作中消耗的功率。
    • 7. 发明授权
    • Method for fabricatins dynamic random access memory device having a
capacitor for storing impact ionization charges
    • 一种用于制造具有用于存储冲击电离电荷的电容器的动态随机存取存储器件的方法
    • US5270242A
    • 1993-12-14
    • US17903
    • 1993-02-16
    • Hidekazu OdaKiyoteru KobayashiTakehisa Yamaguchi
    • Hidekazu OdaKiyoteru KobayashiTakehisa Yamaguchi
    • H01L27/108H01L29/786H01L21/70H01L27/00
    • H01L27/10805H01L29/78654
    • Each memory cell of a dynamic random access memory comprises a semiconductor layer of a first conductivity type, one and the other impurity regions of a second conductivity type, a gate electrode, a capacitor impurity region of the first conductivity type, and a capacitor electrode. The semiconductor layer of the first conductivity type comprises a first surface and a second surface located opposite to the first surface. One and the other impurity regions are formed spaced apart from each other in the semiconductor layer so as to define a channel region with a channel surface being a part of the first surface of the semiconductor layer. The gate electrode is formed on the channel surface through a gate insulating film. The capacitor impurity region is formed opposing to the channel region, near the second surface of the semiconductor layer and having a concentration higher than that of the semiconductor layer. The capacitor electrode is formed on the capacitor impurity region through a dielectric film. Reduced surface area occupied by each memory cell comprising a field effect transistor and a capacitor enables miniaturization of the memory cell. Electric charges generated by the impact ionization phenomenon are stored in the capacitor, so that a power consumed in a writing operation of data can be reduced.
    • 动态随机存取存储器的每个存储单元包括第一导电类型的半导体层,第二导电类型的一个和另一个杂质区,第一导电类型的栅电极,电容器杂质区和电容器电极。 第一导电类型的半导体层包括第一表面和与第一表面相对的第二表面。 在半导体层中形成彼此间隔开的一个和其它杂质区,以便限定沟道区,其中沟道表面是半导体层的第一表面的一部分。 栅电极通过栅极绝缘膜形成在沟道表面上。 在半导体层的第二表面附近形成与沟道区相对的电容器杂质区,其浓度高于半导体层的浓度。 电容器电极通过电介质膜形成在电容器杂质区上。 由包括场效应晶体管和电容器的每个存储单元占用的减小的表面积使得能够使存储单元小型化。 由电击现象产生的电荷存储在电容器中,从而可以减少数据写入操作中消耗的功率。