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    • 5. 发明授权
    • Method of forming memory cell access device
    • 形成存储单元访问装置的方法
    • US08525290B2
    • 2013-09-03
    • US13168753
    • 2011-06-24
    • Erh-Kun LaiHsiang-Lan LungEdward Kiewra
    • Erh-Kun LaiHsiang-Lan LungEdward Kiewra
    • H01L21/70
    • H01L27/1021H01L27/101
    • A memory device includes an access device including a first doped semiconductor region having a first conductivity type, and a second doped semiconductor region having a second conductivity type opposite the first conductivity type. Both the first and the second doped semiconductor regions are formed in a single-crystalline semiconductor body, and define a p-n junction between them. The first and second doped semiconductor regions are implemented in isolated parallel ridges formed in the single-crystal semiconductor body. Each ridge is crenellated, and the crenellations define semiconductor islands; the first doped semiconductor region occupies a lower portion of the islands and an upper part of the ridge, and the second doped semiconductor region occupies an upper portion of the islands, so that the p-n junctions are defined within the islands.
    • 存储器件包括一个存取器件,它包括具有第一导电类型的第一掺杂半导体区域和具有与第一导电类型相反的第二导电类型的第二掺杂半导体区域。 第一掺杂半导体区域和第二掺杂半导体区域均形成在单晶半导体本体中,并且在它们之间限定p-n结。 第一和第二掺杂半导体区域被实现在形成在单晶半导体本体中的隔离的平行脊中。 每个山脊都是锯齿状的,扇形界定半岛; 第一掺杂半导体区域占据岛的下部和脊的上部,并且第二掺杂半导体区占据岛的上部,从而在岛内限定p-n结。