摘要:
A non-volatile memory includes a single transistor having a semiconductor substrate, source and drain diffusion layers formed on a surface of the semiconductor substrate, and a gate electrode provided on the semiconductor substrate with a gate insulating film interposed between them. The non-volatile memory further includes a programmable insulating film provided in self-alignment between the gate electrode and at least one of the source and drain diffusion layers and the programmable insulating film is broken down by a voltage applied to the gate electrode so as to execute programming.
摘要:
An improved LOCOS method for forming an isolation region with a higher breakdown voltage and a reduced width in a semiconductor device, comprising the steps of:(a) forming on a silicon substrate a silicon nitride layer having a predetermined pattern and a tapered-slant side wall, between the silicon nitride layer and the silicon substrate being formed a silicon oxide layer,(b) subjecting the silicon substrate to an isotropic etching using the silicon nitride layer as a mask to form a recess on the substrate, the recess extending to and under the side wall of the silicon nitride layer, and(c) forming a channel stopper region by implanting an impurity into the silicon substrate through the recess-formed surface, and thereafter growing and forming a LOCOS layer on the recess-formed surface to obtain an isolation region.
摘要:
A process for producing a semiconductor device including the steps of:(a) forming a trench in a semiconductor substrate at a portion thereof where an isolating zone is to be formed,(b) doping the substrate with an impurity element from the inner wall thereof defining the trench to form a high-concentration impurity diffused region, and(c) etching the bottom surface of the trench to increase the depth of the trench, thereby separating the impurity diffused region to form the isolating zone,which is useful for the fabrication of semiconductor devices of high integration with low well resistance.
摘要:
A semiconductor memory device composed of a DRAM, an EEPROM, a mode switch means for selecting either mode of the DRAM mode and the EEPROM mode, and a transfer means for transferring data stored in the DRAM to the EEPROM and vice versa. The DRAM consists of one transistor and one capacitor, and one of the terminals of the capacitor is electrically isolated.
摘要:
A nonvolatile semiconductor memory device including a semiconductor substrate, a pair of impurity diffusion regions provided in the substrate, a gate region provided between the pair of impurity diffusion regions, a first gate electrode stacked on the gate region via a first dielectric film, and a second gate electrode stacked on the first gate electrode via a second dielectric film, the first gate electrode being electrically short-circuited to one of the impurity diffusion regions.
摘要:
A non-volatile semiconductor memory providing a semiconductor substrate including source and drain diffusion regions and a gate electrode, and an insulating film which is at least provided on the semiconductor substrate just below the gate electrode and has a smaller dielectric breakdown strength on the source side than on the drain side, wherein the insulating film is comprised of a laminated film having a multilayer structure on the drain side and a single-layer film or multilayer film which is broken down at a smaller voltage on the source side than on the drain side, and a predetermined voltage is applied to break down the single-layer film or multilayer film on the source side, so that data can electrically be written only once.
摘要:
A semiconductor memory device having memory cells in which a DRAM section and an EEPROM section are combined, and a transistor for transferring data between the DRAM and EEPROM sections is disclosed. The DRAM section includes a MOS transistor, and a capacitor one electrode of which is connected to the source of the MOS transistor. The EEPROM section has a floating gate transistor. The transistor for transfer is connected between the source of the MOS transistor and the source/drain of the floating gate transistor. The control gate of the floating gate transistor is connected to the source of the MOS transistor. Methods of rewriting and recalling data in the semiconductor memory device are also disclosed. The methods can be performed without shortening the life of the EEPROM section.
摘要:
A nonvolatile random access memory comprising a nonvolatile random access memory unit having on a substrate an EEPROM having a tunnel oxide film and a floating gate, and a DRAM linked to the EEPROM, a thermal oxide film being selectively formed between the EEPROM and another EEPROM adjacent thereto, the tunnel regions of the respective EEPROMs being provided as self-aligned with the respective ends of the thermal oxide film and positioned at the respective ends of an impurity ion implantation pattern for use in forming a source region of the EEPROMs.
摘要:
A semiconductor memory device comprising a DRAM, an EEPROM, a mode switch circuit for selecting either mode of the DRAM mode and the EEPROM mode, and a transfer circuit for transferring data stored in the DRAM to the EEPROM and vice versa. The DRAM consists of one transistor and one capacitor, and one of the terminals of the capacitor is electrically isolated. The EEPROM consists of a floating gate and a control gate, and the mode switch circuit consists of a MOS transistor having a control gate integrally formed with the control gate of the EEPROM.
摘要:
A semiconductor memory device comprising a DRAM, an EEPROM, a mode switch for selecting either mode of the DRAM mode and the EEPROM mode, and a transfer circuit for transferring data stored in the DRAM to the EEPROM and vice versa. The DRAM consists of one transistor and one capacitor, and one of the terminals of the capacitor is electrically isolated.