Patent application number | Description | Published |
20100202186 | SEMICONDUCTOR MEMORY DEVICE, METHOD OF MANUFACTURING THE SAME, AND METHOD OF SCREENING THE SAME - A semiconductor memory device includes first and second memory cells each including a variable resistance element and a diode and having a pillar shape, and an insulating layer provided between the first memory cell and the second memory cell and including a void. A central portion of the diode has a smaller width than widths of upper and lower portions of the diode. | 08-12-2010 |
20100213550 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE - The memory cell is located at respective intersections between the first wirings and the second wirings. Each of the memory cells has a rectifier element and a variable resistance element connected in series. The rectifier element includes a p type first semiconductor region, and a n type second semiconductor region. The first semiconductor region is formed of, at least in part, silicon-germanium mixture (Si | 08-26-2010 |
20100237314 | RESISTANCE CHANGE TYPE MEMORY - A resistance change type memory of an aspect of the present invention including a first wiring configured to extend in a first direction, a second wiring configured to extend in a second direction crossing the first direction, a series circuit configured to connect to the first and second wirings, the series circuit including a non-ohmic element being more conductive in the first to second wiring direction than in the second to first direction and a resistance change type storage element in which data is stored according to a change of a resistance state, an energy supplying circuit configured to connect to the first wiring to supply energy to the first wiring, the energy being used to store the data in the resistance change type storage element, and a capacitance circuit configured to include a capacitive element and being connected to the second wiring. | 09-23-2010 |
20100237346 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE AND METHOD OF MANUFACTURING THE SAME - A rectifier is formed by forming a first electrode layer, a semiconductor layer and a second electrode layer. A third electrode layer is formed between the first electrode layer and the semiconductor layer, or between the second electrode layer and the semiconductor layer. | 09-23-2010 |
20100238704 | SEMICONDUCTOR MEMORY DEVICE, METHOD OF MANUFACTURING THE SAME, AND METHOD OF SCREENING THE SAME - A memory cell comprises a variable resistance film; a first conductive film having one surface contacted with one surface of the variable resistance film; and a second conductive film having one surface contacted with another surface of the variable resistance film. A width of the first conductive film or the second conductive film in a direction orthogonal to a direction that a current flows in the first conductive film or the second conductive film is smaller than a width of the variable resistance film in a direction orthogonal to a direction that a current flows in the variable resistance film. The width of the first conductive film and the second conductive film is smaller than a width of the first line and the second line in a direction orthogonal to a direction that a current flows in the first line and the second line. | 09-23-2010 |
20110002156 | SEMICONDUCTOR MEMORY DEVICE - A semiconductor memory device includes a plurality of first wirings; a plurality of second wirings; a plurality of memory cells positioned at respective intersections of the first wirings and the second wirings, each of the memory cells having a variable resistance element and a selective element connected to the variable resistance element in series; a first selection portion selecting the first wiring; a second selection portion selecting the second wiring; and a power source portion applying predetermined selected-wiring-voltages to a selected first wiring being selected by the first selection portion and a selected second wiring being selected by the second selection portion, respectively, and applying predetermined unselected-wiring-voltages to unselected first wirings other than the selected first wiring and unselected second wirings other than the selected second wiring, respectively. A resistance element having a predetermined resistance value is provided between the power source portion and the unselected first and second wirings. | 01-06-2011 |
20110026299 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE AND METHOD OF DATA WRITE/DATA ERASE THEREIN - A nonvolatile semiconductor memory device comprises: a plurality of first lines; a plurality of second lines; a plurality of memory cells each disposed at each of crossing-points of the first lines and the second lines and each comprising a variable resistor and a bi-directional diode; and a voltage control circuit configured to control a voltage of selected one of the first lines, unselected ones of the first lines, selected one of the second lines, and unselected ones of the second lines, respectively. The variable resistor is configured to change its resistance value depending on a polarity of a voltage applied thereto. The voltage control circuit is configured to apply a voltage pulse to the selected one of the first lines and to connect a capacitor of a certain capacitance to one end of the selected one of the second lines. | 02-03-2011 |
20110210304 | STORAGE DEVICE - According to the embodiment, a storage device includes row lines arranged parallel to one another, column lines arranged parallel to one another to intersect with the row lines, and a memory cell disposed at each of intersections of the row lines and the column lines and including a resistance-change element and a diode connected in series to the resistance-change element. The diode includes a stack of a first semiconductor region containing an impurity of a first conductivity type, a second semiconductor region containing an impurity of the first conductivity type lower in concentration than in the first semiconductor region, and a third semiconductor region containing an impurity of a second conductivity type. An impurity concentration in the second semiconductor region of the diode in a first adjacent portion adjacent to the first semiconductor region is higher than that in a second adjacent portion adjacent to the third semiconductor region. | 09-01-2011 |
20110228589 | RESISTANCE CHANGE MEMORY - A memory includes memory cells each includes a resistance change element and a diode. The diode comprises areas which is provided in order of a first semiconductor area with a first conductivity type, a second semiconductor area with the first conductivity type, and a third semiconductor area with a second conductivity type, from the column lines to the row lines. An atom density of impurities with the first conductivity type in the second semiconductor area is lower than that in the first semiconductor area. The diode comprises a fourth semiconductor area with the first conductivity type at an end portion in a third direction of the second semiconductor area, the third direction is perpendicular to a direction from the column lines to the row lines, and an atom density of impurities with the first conductivity type in the fourth semiconductor area is higher than that in the second semiconductor area. | 09-22-2011 |
20110228590 | RESISTANCE CHANGE MEMORY - A memory includes memory cells each includes a resistance change element and a diode, and each memory cell between one of row lines and one of column lines, a first decoder which selects one of the row lines as a selected row line, a second decoder which selects one of the column lines as a selected column line, a voltage pulse generating circuit which generates a voltage pulse, a voltage pulse shaping circuit which makes a rise time and a fall time of the voltage pulse longer, and a control circuit which applies the voltage pulse outputting from the voltage pulse shaping circuit to unselected column lines except the selected column line, and which applies a fixed potential to unselected row lines except the selected row line, in a data writing to a memory cell which is provided between the selected row line and the selected column line. | 09-22-2011 |
20130294147 | RESISTANCE CHANGE MEMORY - A memory includes memory cells each includes a resistance change element and a diode, and each memory cell between one of row lines and one of column lines, a first decoder which selects one of the row lines as a selected row line, a second decoder which selects one of the column lines as a selected column line, a voltage pulse generating circuit which generates a voltage pulse, a voltage pulse shaping circuit which makes a rise time and a fall time of the voltage pulse longer, and a control circuit which applies the voltage pulse outputting from the voltage pulse shaping circuit to unselected column lines except the selected column line, and which applies a fixed potential to unselected row lines except the selected row line, in a data writing to a memory cell which is provided between the selected row line and the selected column line. | 11-07-2013 |