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    • 31. 发明申请
    • SEMICONDUCTOR MEMORY DEVICE
    • 半导体存储器件
    • US20120314480A1
    • 2012-12-13
    • US13490713
    • 2012-06-07
    • Junya ONISHINobuyoshi AwayaMitsuru NakuraKazuya Ishihara
    • Junya ONISHINobuyoshi AwayaMitsuru NakuraKazuya Ishihara
    • G11C11/00
    • G06F11/1048G11C13/004G11C13/0061G11C2029/0411
    • In a semiconductor memory device using a variable resistive element made of a metal oxide for storing information, a voltage amplitude of a writing voltage pulse for changing the variable resistive element to a high resistance state is set within a voltage range in which the resistance value of the high resistance state after the change increases with time. The voltage amplitude is set within the voltage range in which the resistance value of the high resistance state after the change increases toward a predetermined peak with increase in voltage amplitude. When a data error is detected by the ECC circuit, it is estimated that the data that should be in the low resistance state changes to the high resistance state, and the variable resistive elements of all memory cells from which the error is detected are written to the low resistance state to correct the error bit.
    • 在使用由金属氧化物制成的可变电阻元件用于存储信息的半导体存储器件中,将可变电阻元件改变为高电阻状态的写入电压脉冲的电压幅度设定在电阻值 变化后的高电阻状态随时间而增加。 电压幅度设定在电压范围内,随着电压振幅的增加,变化后的高电阻状态的电阻值向预定的峰值增加。 当ECC电路检测到数据错误时,估计应该处于低电阻状态的数据变为高电阻状态,并且将检测到错误的所有存储单元的可变电阻元件写入 低电阻状态来纠正错误位。
    • 32. 发明申请
    • NON-VOLATILE SEMICONDUCTOR DEVICE
    • 非挥发性半导体器件
    • US20120025163A1
    • 2012-02-02
    • US13182696
    • 2011-07-14
    • Junya ONISHIShinobu YamazakiKazuya IshiharaYushi InoueYukio TamaiNobuyoshi Awaya
    • Junya ONISHIShinobu YamazakiKazuya IshiharaYushi InoueYukio TamaiNobuyoshi Awaya
    • H01L45/00
    • H01L45/04H01L27/2436H01L45/1233H01L45/146
    • A variable resistance element that can stably perform a switching operation with a property variation being reduced by suppressing a sharp current that accompanies completion of forming process, and a non-volatile semiconductor memory device including the variable resistance element are realized. The non-volatile semiconductor memory device uses the variable resistance element for storing information in which a resistance changing layer is interposed between a first electrode and a second electrode, and a buffer layer is inserted between the first electrode and the resistance changing layer where a switching interface is formed. The buffer layer and the resistance changing layer include n-type metal oxides, and materials of the buffer layer and the resistance changing layer are selected such that energy at a bottom of a conduction band of the n-type metal oxide configuring the buffer layer is lower than that of the n-type metal oxide configuring the resistance changing layer.
    • 通过抑制伴随着成形处理的完成的尖锐电流,可以稳定地进行具有特性变化的开关动作的可变电阻元件,以及包括该可变电阻元件的非易失性半导体存储器件。 非易失性半导体存储器件使用可变电阻元件来存储在第一电极和第二电极之间插入电阻变化层的信息,并且缓冲层插入在第一电极和电阻变化层之间,其中开关 界面形成。 缓冲层和电阻变化层包括n型金属氧化物,并且选择缓冲层和电阻变化层的材料,使得构成缓冲层的n型金属氧化物的导带的底部的能量为 低于构成电阻变化层的n型金属氧化物。