摘要:
A semiconductor device comprises a complementary MOS transistor integrated circuit formed in a semiconductor single crystal silicon disposed on an electrically insulating layer. A thickness of the single crystal silicon in a region in which an N-type MOS transistor is formed is made thicker than the thickness in a region in which a P-type MOS transistor is formed. By this structure, the bottoms of the source region and the drain region of the N-type transistor are separated from the electrically insulating layer by a predetermined distance. The separation of the source region and the drain region from the electrically insulating layer is effective to prevent a parasitic channel from forming, thereby reducing leakage current and making the semiconductor device more efficient.
摘要:
A semiconductor substrate is utilized to integrally form a drive circuit and a pixel array to produce a transparent semiconductor device for a light valve. The semiconductor device for a light valve is constructed by a semiconductor substrate composed of a bulk single crystal silicon having an opaque thick portion and a thin transparent portion. A pixel array is formed in the transparent portion. A drive circuit is formed in a top face of the opaque portion. A transparent support substrate is laminated to the top face of the semiconductor substrate for reinforcement. A bulk portion of the semiconductor substrate is removed from a back face thereof by selective etching to provide the transparent portion.
摘要:
An impurity adsorption layer is selectively formed from a gas containing an impurity on a semiconductor surface. Solid-phase diffusion of the impurity is effected from the impurity adsorption layer into the semiconductor surface to form a source region and a drain region having a sufficiently small resistivity and an ultrashallow PN junction depth, thereby producing a metal-insulator semiconductor field-effect-transistor featuring fast operating speed and reduced dimensions.
摘要:
A warning sound generating device includes a sound source member and an enclosure for protecting the sound source member. A front wall of the enclosure and a sound emitting portion of the sound source member face each other. The front wall of the enclosure has at least one continuous projecting wall extending toward the sound source member. The sound source member has at least one continuous projecting wall extending toward the enclosure and surrounding the sound emitting portion. The enclosure has a plurality of sound exits formed outwardly from the outermost projectng wall of the enclosure. The projecting walls of the sound source member and the enclosure cooperate to define a sound passageway through which a sound generated from the sound emitting portion passes. Each of the projecting walls has a thickness decreasing from the base to the forward rim thereof, so that the passageway has a width between the projecting walls increasing from the sound emitting portion to the sound exits.
摘要:
A MISFET is provided with a segmented channel comprising regions in which the channel is inverted by a first gate voltage and regions in which the channel is inverted by a second gate voltage. The MISFET is formed in a semiconductor substrate having a first conductivity type and the first inversion region of the channel has a first impurity concentration determined by the surface concentration of the substrate. The second inversion region of the channel has a second impurity concentration determined by doping an impurity to the region selected by a photolithographic process. The first and second inversion regions may be divided into a plurality of plane shapes and the threshold voltage of the MISFET is set to a desired value in accordance with the plane area ratio of the first and second inversion regions.
摘要:
A semiconductor device including multiple high-voltage drive transistors in its output section is improved in electrostatic withstand voltage by connecting electrostatic protection transistors in parallel with the high-voltage drive transistors connected to the output pads. The drain withstand voltage of the electrostatic protection transistors is made lower than the drain withstand voltage of the high-voltage drive transistors. In addition, the channel length of electrostatic protection transistors is made short to enable efficient bipolar operation of the electrostatic protection transistors.
摘要:
A semiconductor substrate is utilized to integrally form a drive circuit and a pixel array to produce a transparent semiconductor device for a light valve. The semiconductor device for a light valve is constructed of a semiconductor substrate composed of a bulk single crystal silicon having an opaque thick portion and a thin transparent portion. A pixel array is formed in the transparent portion. A drive circuit is formed in a top face of the opaque portion. A transparent support substrate is laminated to the top face of the semiconductor substrate for reinforcement. A bulk portion of the semiconductor substrate is removed from a back face thereof by selective etching to provide the transparent portion.
摘要:
A method of fabricating a light valve device comprises forming a substrate having stacked layers including a light-shielding thin film layer, an insulating film, and a single crystalline semiconductor thin film stacked in this order on a transparent support substrate. A light-shielding layer pattern is formed by selectively etching the stacked layers. Thereafter, a switching element is formed comprised of a transistor having a channel region formed in the single crystalline semiconductor thin film and a main gate electrode covering the channel region. The channel region is provided over the light-shielding pattern layer to prevent light incident from the transparent support substrate from illuminating the channel region to suppress a photo-induced leakage current in the channel region. A transparent electrode is formed and is electrically connected to the switching element. An opposing substrate is then provided over the substrate at the side of the single crystalline semiconductor thin film, and an electro-optical material layer is interposed between the substrate and the opposing substrate.
摘要:
To decrease the area of a chip, improve the manufacturing efficiency and decrease the cost in a semiconductor device such as a driver integrated circuit having a number of output pads, and an electronic circuit device such as electronic clock. There are disposed output pads superposed in two dimensions on driving transistors or logic circuits connected thereto, respectively. Further, not only aluminum interconnection but also bump electrodes or barrier metals are used for the interconnection of the semiconductor device. In a case where a semiconductor integrated circuit is electrically adhered on to a printed circuit board in a face down manner, a solder bump disposed on the semiconductor integrated circuit and the interconnection of the printed circuit board are directly connected to each other, thereby realizing the electrical connection. On this occasion, the bump electrode as the external connecting terminal of the semiconductor integrated circuit is laminated on the transistor.
摘要:
A resistor ladder network may be formed with a reduced space on a semiconductor substrate by patterning a plurality of layers of resistive polycrystalline silicon films spaced by insulating layers. Such a device includes a first insulating film formed on a semiconductor substrate, one or more serial-connected first resistors formed in a first polycrystalline silicon film provided on the semiconductor substrate via the first insulating film, a second insulating film provided on the first polycrystalline silicon film, one or more series-connected second resistors formed in a second polycrystalline silicon film provided apart from the first polycrystalline silicon film via the second insulating film, the second polycrystalline silicon film being connected to the first polycrystalline silicon film. A third insulating film is provided over the second polycrystalline silicon film, and metal wires provided on a surface of the second polycrystalline silicon film via contact holes formed in the third insulating film. Preferably, the first polycrystalline silicon film is thicker than the second polycrystalline silicon film, the impurity concentration of the first polycrystalline silicon film is lower than the impurity concentration of the second polycrystalline silicon film, and the grain size of the first polycrystalline silicon film is smaller than that of the second polycrystalline silicon film.