摘要:
A display device having a thin film semiconductor device including a semiconductor thin film having first and second semiconductor regions formed each into a predetermined shape above an insulative substrate, a conductor fabricated into a predetermined shape to the semiconductor thin film and a dielectric film put between the semiconductor thin film and the conductor, in which the semiconductor thin film is a polycrystal thin film with the crystallization ratio thereof exceeding 90% and the difference of unevenness on the surface of the semiconductor thin film does not exceed 10 nm.
摘要:
The present invention is a semiconductor memory device having a logic block and a memory block on the same chip. In the memory device, unit memory cells each include at least two transistors, one of which is a write transistor for storing an electric charge into and releasing it from an electric charge storage node, and the other is a read transistor whose conductance in a channel region provided between a source and drain of the read transistor is modulated dependently on the amount of electric charge stored into or released from the electric charge storage node by the write transistor. The read transistor has a gate-insulating film thicker than that of a transistor provided in the logic block, and uses the same diffusion layer structure as that of the logic block.
摘要:
A gate dielectric functioning as a charge-trapping layer of a non-volatile memory cell with a structure of an insulator gate field effect transistor is formed by laminating a first insulator formed of a silicon oxide film, a second insulator formed of a silicon nitride film, a third insulator formed of a silicon nitride film containing oxygen, and a fourth insulator formed of a silicon oxide film in this order on a main surface of a semiconductor substrate. Holes are injected into the charge-trapping layer from a gate electrode side. Accordingly, since the operations can be achieved without the penetration of the holes through the interface in contact to the channel and the first insulator, the deterioration in rewriting endurance and the charge-trapping characteristics due to the deterioration of the first insulator does not occur, and highly efficient rewriting (writing and erasing) characteristics and stable charge-trapping characteristics can be achieved.
摘要:
A MEMS switch is provided with a substrate, a diaphragm which is disposed on the substrate with interposing a cavity therebetween and is elastically deformed by electrostatic force, a switch drive electrode disposed on the substrate, and a switch drive electrode disposed on the diaphragm. Further, a charge accumulation electrode is disposed on the diaphragm between the switch drive electrode and the switch drive electrode. When charge is accumulated in the charge accumulation electrode, electrostatic force is generated between the charge accumulation electrode and the switch drive electrode, thereby deforming the diaphragm. Accordingly, a small-sized bistable MEMS switch whose structure is simple, whose holding state is stable for a long period, and which can be easily mounted together with a semiconductor integrated circuit can be realized.
摘要:
A semiconductor device, which ensures device reliability especially in fine regions and enables great capacitance and high-speed operations, has memory cells including, in a first region of a main surface of a semiconductor substrate, a gate insulating film, a floating gate electrode, an interlayer insulating film, a control gate electrode, and source and drain regions of the second conduction type arranged in a matrix, with a shallow isolation structure for isolating the memory cells. When using a shallow structure buried with an insulating film for element isolation, the isolation withstand voltage in fine regions can be prevented from lowering and the variation in threshold level of selective transistor can be reduced. When the memory cells in a memory mat are divided by means of selective transistors, the disturb resistance of the memory cells can be improved.
摘要:
A semiconductor device and a method for manufacturing the same of forming a silicon nitride film selectively without giving damages or contaminations to a surface of the silicon substrate thereby forming different types of gate dielectrics in one identical silicon substrate, are obtained by forming a silicon dioxide on the surface of a silicon substrate, then removing a portion thereof, forming a silicon nitride film to the surface of the substrate from which the silicon dioxide has been removed and, simultaneously, introducing nitrogen to the surface of the silicon dioxide which is left not being removed or, alternatively, depositing a silicon dioxide on the surface of the silicon substrate by chemical vapor deposition, then removing a portion thereof, forming a silicon nitride film on the surface of a substrate from which the silicon dioxide has been removed, and, simultaneously, introducing nitrogen to the surface of the silicon dioxide left not being removed, successively, dissolving and removing nitrogen-introduced silicon oxide film to expose the surface of the substrate and oxidizing the exposed surface of the silicon substrate and the silicon nitride film
摘要:
Conventionally, a MONOS type nonvolatile memory is fabricated by subjecting a silicon nitride film to ISSG oxidation to form a top silicon oxide film of ONO structure. If the ISSG oxidation conditions are severe, repeats of programming/erase operation cause increase of interface state density (Dit) and electron trap density. This does not provide a sufficient value of the on current, posing a problem in that the deterioration of charge trapping properties cannot be suppressed. For the solution to the problem, the silicon nitride film is oxidized by means of a high concentration ozone gas to form the top silicon oxide film.
摘要:
A semiconductor device, which ensures device reliability especially in fine regions and enables great capacitance and high-speed operations, has memory cells including, in a first region of a main surface of a semiconductor substrate, a gate insulating film, a floating gate electrode, an interlayer insulating film, a control gate electrode, and source and drain regions of the second conduction type arranged in a matrix, with a shallow isolation structure for isolating the memory cells. When using a shallow structure buried with an insulating film for element isolation, the isolation withstand voltage in fine regions can be prevented from lowering and the variation in threshold level of selective transistors can be reduced. When the memory cells in a memory mat are divided by means of selective transistors, the disturb resistance of the memory cells can be improved.
摘要:
Disclosed is a semiconductor device (e.g., nonvolatile semiconductor memory device) and method of forming the device. The device includes a gate electrode (e.g., floating gate electrode) having a first layer of an amorphous silicon film, or a polycrystalline silicon thin film or a film of a combination of amorphous and polycrystalline silicon, on the gate insulating film. Where the film includes polycrystalline silicon, the thickness of the film is less than 10 nm. A thicker polycrystalline silicon film can be provided on or overlying the first layer. The memory device can increase the write/erase current significantly without increasing the low electric field leakage current after application of stresses, which in turn reduces write/erase time substantially. In forming the semiconductor device, a thin amorphous or polycrystalline silicon film can be provided on the gate insulating film, and a thin insulating film provided on the amorphous silicon film, with a thicker polycrystalline silicon film provided on or overlying the thin insulating film. Where the thin silicon film is amorphous silicon, it can then be polycrystallized, although it need not be. Also disclosed is a technique for selective crystallization of amorphous silicon layers, based upon layer thickness.
摘要:
A semiconductor device, which ensures device reliability especially in fine regions and enables great capacitance and high-speed operations, has memory cells including, in a first region of a main surface of a semiconductor substrate, a gate insulating film, a floating gate electrode, an interlayer insulating film, a control gate electrode, and source and drain regions of the second conduction type arranged in a matrix, with a shallow isolation structure for isolating the memory cells. When using a shallow structure buried with an insulating film for element isolation, the isolation withstand voltage in fine regions can be prevented from lowering and the variation in threshold level of selective transistors can be reduced. When the memory cells in a memory mat are divided by means of selective transistors, the disturb resistance of the memory cells can be improved.