摘要:
A center hub holder tape includes a generally nonstretchable carrier tape having a series of apertures formed therethrough and spaced at an equal interval from one another along the length of the carrier tape. A series of center hubs for use in a recording disc are carried by the carrier tape, with their tubular bodies removably inserted in the apertures in the carrier tape, respectively. An adhesive layer is interposed between one side of the carrier tape and a flange around the body of the center hub to adhesively bond them together. The adhesive layer is releaseably bonded to the one side of the carrier tape so that center hub can be removed from the carrier tape together with the adhesive layer.
摘要:
This disclosure concerns a semiconductor memory device including a semiconductor substrate; a buried insulation film provided on the semiconductor substrate; a semiconductor layer provided on the buried insulation film; a source layer and a drain layer provided in the semiconductor layer; a body region provided in the semiconductor layer between the source layer and the drain layer, and being in an electrically floating state, the body region accumulating or discharging charges to store data; a gate dielectric film provided on the body region; a gate electrode provided on the gate dielectric film; and a plate electrode facing a side surface of the body region via an insulation film, in an element isolation region.
摘要:
A semiconductor device of one embodiment of the present invention includes a substrate; isolation layers, each of which is formed in a trench formed on the substrate and has an insulating film and a conductive layer; a semiconductor layer of a first conductivity type for storing signal charges, formed between the isolation layers and isolated from the conductive layers by the insulating films; a semiconductor layer of a second conductivity type, formed under the semiconductor layer of the first conductivity type; and a transistor having a gate insulator film formed on the semiconductor layer of the first conductivity type and a gate electrode formed on the gate insulator film.
摘要:
This disclosure concerns a method of manufacturing a semiconductor memory device comprising forming a plurality of trenches in a semiconductor substrate; forming a semiconductor layer provided on a cavity by connecting lower spaces of the trenches to one another and closing upper openings of the trenches in a heat treatment under a hydrogen atmosphere; etching the semiconductor layer in an isolation formation area; forming an insulating film on a side surface and a bottom surface of the semiconductor layer; filling the cavity under the semiconductor layer with an electrode material; and forming a memory element on the semiconductor layer.
摘要:
The disclosure concerns a semiconductor memory device comprising a semiconductor layer; a charge trap film in contact with a first surface of the semiconductor layer; a gate insulating film in contact with a second surface of the semiconductor layer, the second surface being opposite to the first surface; a back gate electrode in contact with the charge trap film; a gate electrode in contact with the gate insulating film; a source and a drain formed in the semiconductor layer; and a body region provided between the drain and the source, the body region being in an electrically floating state, wherein a threshold voltage or a drain current of a memory cell including the source, the drain, and the gate electrode is adjusted by changing number of majority carriers accumulated in the body region and a quantity of charges trapped into the charge trap film.
摘要:
To easily and accurately flush a substrate surface serving an SOI area with a substrate surface serving as a bulk area, make a buried oxide film, and prevent an oxide film from being exposed on substrate surface. After partially forming a mask oxide film 23 on the surface of a substrate 12 constituted of single crystal silicon, oxygen ions 16 are implanted into the surface of the substrate through the mask oxide film, and the substrate is annealed to form a buried oxide film 13 inside the substrate. Further included is a step of forming a predetermined-depth concave portion 12c deeper than substrate surface 12b serving as a bulk area on which the mask oxide film is formed on the substrate surface 12a serving as an SOI area by forming a thermally grown oxide film 21 on the substrate surface 12a serving as an SOI area on which the mask oxide film is not formed between the step of forming the mask oxide film and the step of implanting oxygen ions.
摘要:
According to this invention, there is provided a NAND-type semiconductor storage device including a semiconductor substrate, a semiconductor layer formed on the semiconductor substrate, a buried insulating film selectively formed between the semiconductor substrate and the semiconductor layer in a memory transistor formation region, diffusion layers formed on the semiconductor layer in the memory transistor formation region, floating body regions between the diffusion layers, a first insulating film formed on each of the floating body regions, a floating gate electrode formed on the first insulating film, a control electrode on a second insulating film formed on the floating gate electrode, and contact plugs connected to ones of the pairs of diffusion layers which are respectively located at ends of the memory transistor formation region, wherein the ones of the pairs of diffusion layers, which are located at the ends of the memory transistor formation region, are connected to the semiconductor substrate below the contact plugs.
摘要:
At the time of burn-in test, substrate voltages of transistors in a sense amplifier are switched by a PMOS substrate voltage generating portion and an NMOS substrate voltage generating portion. Specifically, the substrate voltage of a P channel MOS transistor is increased during the test than in a normal operation, whereas the substrate voltage of an N channel MOS transistor is decreased during the test than in the normal operation. Consequently, the threshold voltages of the P channel and N channel MOS transistors can be increased upon the test. Leakage currents in the turned-off states can be reduced, and thus, power consumption during the burn-in test can be decreased.
摘要:
An insulated gate type field effect transistor in a memory cell array is a transistor having a gate insulating film which is thicker than a gate insulating film of an insulated gate type field effect transistor in an array peripheral circuit. DRAM (Dynamic Random Access Memory) cell-based semiconductor memory device can be implemented which allows a burn-in test to be accurately performed without degrading sensing operation characteristics even under a low power supply voltage.
摘要:
Data indicating whether a short-circuit defect exists in a memory block is programmed a fuse program circuit. In accordance with the fuse program data and a mode instruction signal, the correspondence relationship between a block select signal and a corresponding bit line isolation instruction signal is switched by a circuit that generates the bit line isolation instruction signal in a specific mode. It becomes possible to isolate the memory block in which a leakage current path exists from a corresponding sense amplifier band in a specific operation mode. Current consumption at least at a standby state is reduced.