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    • 4. 发明授权
    • Nonvolatile semiconductor memory device, a method of fabricating the
same, and read, erase write methods of the same
    • 非易失性半导体存储器件,其制造方法以及其读取,擦除写入方法
    • US6046927A
    • 2000-04-04
    • US177569
    • 1998-10-23
    • Jong-ho LeeIn-Seon ParkCha-Young Yoo
    • Jong-ho LeeIn-Seon ParkCha-Young Yoo
    • H01L27/108G11C11/22H01L21/8242H01L21/8246H01L27/105
    • G11C11/22
    • A ferroelectric memory device includes a silicon-on-insulator substrate having a handling wafer, a first insulating layer, and a semiconductor layer. It also includes a first conductive layer used as a bit line formed in the first insulating layer, a source region formed in the semiconductor layer, a drain region formed in the semiconductor layer, a second insulating layer formed over the semiconductor layer between the source and drain regions, a second conductive layer for use as both a lower electrode and gate electrode, formed over the second insulating layer between the source and drain regions, a ferroelectric layer formed over the semiconductor layer, and a third conductive layer for use as an upper electrode formed over the ferroelectric layer. For reading, writing, and erasing, different voltages are applied to the upper electrode and the semiconductor layer between the drain and source. For writing, the upper electrode receives a writing voltage, and the semiconductor layer receives a ground voltage. This brings the drain and source to a floating state to either invert polarization of the ferroelectric layer or retain initial polarization, depending upon the data. For erasing, the upper electrode receives an erasing voltage, and the semiconductor layer receives a ground voltage. This brings the drain and source to a floating state. For reading, the upper electrode receives a reading voltage, and the semiconductor layer receives a ground voltage. A sensing current is then provided to the drain, and potential variation is sensed on the bit line.
    • 铁电存储器件包括具有处理晶片,第一绝缘层和半导体层的绝缘体上硅衬底。 它还包括用作形成在第一绝缘层中的位线的第一导电层,形成在半导体层中的源极区,形成在半导体层中的漏极区,在半导体层之间形成的第二绝缘层, 漏极区域,用作下电极和栅电极的第二导电层,形成在源区和漏区之间的第二绝缘层上,形成在半导体层上的铁电层,以及用作上层的第三导电层 形成在铁电层上的电极。 对于读取,写入和擦除,不同的电压施加到漏极和源极之间的上部电极和半导体层。 对于写入,上部电极接收写入电压,并且半导体层接收地电压。 这取决于数据,将漏极和源极引入浮置状态以反转铁电层的极化或保持初始极化。 为了擦除,上部电极接收擦除电压,半导体层接收接地电压。 这将使排水和源处于浮动状态。 为了读取,上部电极接收读取电压,半导体层接收接地电压。 然后将感测电流提供给漏极,并且在位线上感测到电位变化。