摘要:
The present invention is to cause high channel mobility and a high threshold voltage to coexist in a SiC-MOSFET power device which uses a SiC substrate. The SiC MOSFET which is provided with a layered insulation film having electric charge trap characteristics on a gate insulation film has an irregular threshold voltage in a channel length direction of the SiC MOSFET, and in particular, has a shorter area having a maximum threshold voltage in the channel length direction compared to an area having other threshold voltages.
摘要:
In an ultrasonic transducer comprising a first electrode, a first insulating film disposed on the first electrode, a hollow part provided above the first insulating film and disposed between surfaces above and below the hollow part, a second insulating film disposed above the hollow part, and a second electrode disposed on the second insulating film, a first conductive film disposed on a side of the surface below the hollow part and a second conductive film disposed on a side of the surface above the hollow part are provided, the first conductive film and the second conductive film are disposed so that they overlap with a region in which the surfaces above and below the hollow part contact with each other as seen from above when the transducer is driven, and they do not overlap with each other in the region as seen from above.
摘要:
A technique used for a semiconductor device formed by stacking multiple structural bodies each having a semiconductor device, for preventing generation of thermal load on a structural body at a lower layer which is caused by a laser used in a step of forming a structural body at an upper layer. In a phase-change memory including multiple stacked memory matrices, a metal film is disposed between a memory matrix at a lower layer and a memory matrix at an upper layer formed over the memory matrix at the lower layer, in which the laser used for forming the memory matrix is reflected at the metal film and prevented from transmitting the metal film, thereby preventing the phase-change material layer, etc. in the memory matrix at the lower layer from being directly heated excessively by the laser.
摘要:
There is provided a semiconductor storage device which is capable of further reducing a size of a memory cell, and increasing a storage capacity. Plural memory cells each including a transistor formed on a semiconductor substrate, and a variable resistive device having a resistance value changed by voltage supply and connected between source and drain terminals of the transistor are arranged longitudinally and in an array to configure a three-dimensional memory cell array. A memory cell structure has a double channel structure in which an inside of a switching transistor is filled with a variable resistance element, particularly, a phase change material. The switching transistor is turned off by application of a voltage to increase a channel resistance so that a current flows in the internal phase change material to operate the memory.
摘要:
In a non-volatile memory in which writing/erasing is performed by changing a total charge amount by injecting electrons and holes into a silicon nitride film serving as a charge accumulation layer, in order to realize a high efficiency of a hole injection from a gate electrode, the gate electrode of a memory cell comprises a laminated structure made of a plurality of polysilicon films with different impurity concentrations, for example, a two-layered structure comprising a p-type polysilicon film with a low impurity concentration and a p+-type polysilicon film with a high impurity concentration deposited thereon.
摘要:
In the existent method for manufacturing a solar cell, manufacture of a solar cell having a quantum well having a crystalline well layer and capable of controlling the thickness of the well layer was difficult. A quantum well having an amorphous well layer, comprising a barrier layer and an amorphous well layer is formed and then the quantum well having the amorphous well layer is annealed thereby crystallizing the amorphous well layer to form a quantum well having a crystalline well layer. By applying energy density applied to the amorphous well layer at an energy density of 1.26 J/mm2 or more and 28.8 J/mm2 or less, the crystalline well layer can be formed and the lamination structure of the quantum well can be maintained simultaneously.
摘要翻译:在制造太阳能电池的现有方法中,难以制造具有具有结晶阱层并能够控制阱层的厚度的量子阱的太阳能电池。 形成具有非晶阱层的量子阱,其包含阻挡层和非晶阱层,然后对具有非晶阱层的量子阱退火,从而使非晶阱层结晶,形成具有结晶阱层的量子阱。 通过以1.26J / mm 2以上且28.8J / mm 2以下的能量密度施加到非晶质阱层的能量密度,可以形成结晶阱层,同时可以维持量子阱的层叠结构。
摘要:
To achieve a stable reading operation in a memory cell having a gain-cell structure, a write transistor is configured, which has a source and a drain that are formed on the insulating layer, a channel formed on the insulating layer and between the source and the drain and made of a semiconductor, and a gate formed on an upper portion of the insulating layer and between the source and the drain and electrically insulated from the channel by a gate insulating film and controlling the potential of the channel. The channel electrically connects the source and the drain on the side surfaces of the source and the drain.
摘要:
In a non-volatile memory in which charge is injected from a gate electrode to a charge accumulating layer, charge injection efficiency, charge retention characteristic and reliability are all improved compared with a conventional gate structure. In a nonvolatile memory which carries out write/erasure by changing the total charge amount by injecting electrons and holes into a silicon nitride film which makes up a charge accumulating layer, in order to highly efficiently carry out charge injection from a gate electrode, the gate electrode of a memory cell is made up of a two-layer film of a non-doped polysilicon layer and a metal material electrode layer.
摘要:
The present invention aims to stabilize sound-electricity conversion characteristics of a diaphragm-type sound-electricity conversion device as well as to decrease the noise level of an ultrasonic diagnostic apparatus using the sound-electricity conversion device. The sound-electricity conversion device is configured by a capacitor cell including a lower electrode formed on a silicon substrate and an upper electrode over the lower electrode, the lower and upper electrodes sandwiching a cavity. An electrode short-circuit prevention film is formed on the upper electrode on the cavity side. The electrode short-circuit prevention film is formed of a material with an electrical time constant shorter than 1 second and longer than 10 microseconds, such as silicon nitride containing a stoichiometrically excessive amount of silicon. As a result, the electrode short-circuit prevention film has small electric conductivity, and thus it is made possible to prevent the film from being charged with electric charge and to avoid the drift of the electric charge. Consequently, the sound-electricity conversion characteristics of the sound-electricity conversion device stabilize, and further the sound noise level of the ultrasonic diagnostic apparatus decreases.
摘要:
A technology capable of improving a charge retention characteristic of a nonvolatile memory is provided. In a memory cell in which an interlayer insulating film formed of an ONO film obtained by laminating a lower silicon oxide film, a silicon nitride film, and an upper silicon oxide film is formed between a floating gate formed of a polycrystalline silicon film and a control gate formed of a polycrystalline silicon film, the upper silicon oxide film is formed through LPCVD and is then nitrided through a remote plasma process, thereby introducing nitrogen of, for example, 5 to 6 atom % into the upper surface portion of the upper silicon oxide film.