摘要:
A structure of a semiconductor device and a method of manufacturing the same is provided wherein a leakage current can be reduced while improving a drain breakdown voltage of an Insulated-Gate transistor such as a MOSFET, MOSSIT and a MISFET, and a holding characteristic of a memory cell such as a DRAM using these transistors as switching transistors can be improved, and further a reliability of a gate oxide film in a transfer gate can be improved. More particularly, a narrow band gap semiconductor region such as Si.sub.x Ge.sub.1-x, Si.sub.x Sn.sub.1-x, PbS is formed in an interior of a source region or a drain region in the SOI.IG-device. By selecting location and/or mole fraction of the narrow band gap semiconductor region in a SOI film, or selecting a kind of impurity element to compensate the crystal lattice mismatching due to the narrow-bandgap semiconductor region, the generation of crystal defects can be suppressed. Further the structure that the influences of the crystal defects to the transistor or memory characteristics such as the leakage current can be suppressed, even if the crystal defects are generated, are also proposed.
摘要:
A semiconductor device has a semiconductor substrate having a groove, and a semiconductor element formed in a surface region of the semiconductor substrate. A substance having a thermal expansion coefficient different from the semiconductor substrate is embedded in at least a portion of the groove, a crystal defect is generated from the region near the bottom of the groove in the semiconductor substrate, thereby alleviating stress and strain in other regions of the semiconductor substrate, such that such regions cannot generate crystal defects in a region necessary for a circuit operation of the semiconductor element of the surface region.
摘要:
Element isolation technique for LSIs having a fine pattern of sub-micron class or finer. A high strained region doped with impurities at a high concentration is formed under, and remote from, a buried insulating material (dielectrics) layer for element isolation. With this buried dielectrics element isolation (BDEI) structure, since the high strained layer exists just under the buried dielectrics layer, crystal defects generated near the buried dielectrics layer due to strain caused by a difference of thermal expansion coefficient between a semiconductor layer and the buried dielectrics layer, are moved toward the high strained layer. Accordingly, the crystal defects do not reach an active region where active elements are formed, so that leakage current in the p-n junction formed in the active layer can be advantageously reduced.
摘要:
A multi-layered insulation film of non-doped CVD SiO.sub.2 (silicon dioxide) film and BPSG (boro-phospho-silicate glass) film is formed on a silicon substrate. Films have a contact hole exposing impurity diffused region formed in silicon substrate. A semiconductor layer is formed in the contact hole. An Al (aluminum) film is formed on the semiconductor layer. The semiconductor layer contacts the BPSG film so that the contact resistance between the semiconductor layer and the Al (aluminum) film can be reduced, and a variation of the contact resistance between respective semiconductor devices can also be reduced.
摘要:
A semiconductor substrate having a surface region of P type and a surface region of N type is formed, then an insulating membrane is formed on the semiconductor substrate. The first contact hole which is formed in said region of P type and the second contact hole which is connected to said region of N type are formed by the same process as that for said insulating membrane. Non-doped silicon layer is grown in said first and second contact holes by the same selective growth process, in a single reactive furnace. A diffusion source layer containing impurities of P type is formed on said first contact hole and a diffusion source layer containing impurities of N type on said second contact hole. Impurities are diffused from said diffusion layers to said silicon layers, and said diffusion source layer is then removed. A metal wire layer is formed by connecting it to said silicon layer.
摘要:
The present invention relates to a polarizing film obtained by stretching a polyvinyl alcohol resin film containing iodine, an iodide a cross-linking agent and/or waterproofing agent and then treating the film with a solution containing 0.0001 to 5.0 wt % of inorganic acid except for boric acid or a salt thereof and/or organic acid and having a pH of preferably 2≦pH≦5, more preferably 2.2≦pH≦5. Said polarizing film is excellent in wet heat durability and shows less decrease in polarization characteristics in wet heat test and said polarizing film obtained in a further preferable embodiment is also excellent in dry heat durability.
摘要:
A semiconductor substrate having a shallow trench isolation (STI) structure and a method of manufacturing the same are provided, i.e., an isolation substrate in which grooves are selectively formed at predetermined locations of the semiconductor substrate and oxide films using organic silicon source as material are buried in the grooves as buried oxide films. The present invention is characterized in that the buried oxide films are annealed at a predetermined temperature within the range of 1100 to 1350.degree. C. before or after planarization of the semiconductor substrate such that ring structures of more than 5-fold ring and ring structures of less than 4-fold ring are formed at predetermined rates in the buried oxide films. The above annealing allows stress of the oxide film buried in the grooves to be relaxed. Hence, the generation of dislocation is suppressed.
摘要:
A vapor phase growth apparatus is disclosed, which comprises a boat accommodating therein a plurality of semiconductor substrates, an inner tube surrounding the boat, an outer tube disposed outside the inner tube, a heater disposed outside the outer tube, a reaction gas injection nozzle disposed inside the inner tube and operating to eject a reaction gas against the semiconductor substrates, and a hydrogen halide gas injection nozzle disposed between the inner tube and the outer tube and operating to inject the hydrogen halide gas, wherein exhaust openings for exhausting the reaction gas are formed through a wall of the inner tube, thereby suppressing deposition of a reactant on an outer surface of the inner tube and an inner surface of the outer tube. The reaction gas injected from the reaction gas injection nozzle flows in the portion formed between the inner tube and the outer tube along with in the inner tube. Since the portion between the inner tube and the outer tube is heated by the heater disposed outside the outer tube, a reactant tends to be deposited on the outer surface of the inner tube and the inner surface of the outer tube. By injecting the hydrogen halide gas from the hydrogen halide gas injection nozzle to the portion formed between the inner tube and the outer tube, the deposition of the reactant can be suppressed.
摘要:
A system for analyzing a metal impurity at the surface of a single crystal semiconductor comprising: an incident device for allowing X-ray to be incident, at an incident angle less than a total reflection angle, onto the surface of a wafer in the form of a thin plate comprised of a single crystal semiconductor (e.g., silicon); a wafer fixing/positioning stage wherein when it is assumed that the wafer surface is partitioned by a lattice having an interval d, and that the wavelength of the X-ray from the incident device is .lambda., an angle that the X-ray and the wafer surface form is .theta., and an arbitrary integer is n, the stage is adapted to fix the crystal orientation of the wafer so as to satisfy the condition of "2d sin .theta..noteq.n.lambda.", and to allow sample points to which X-ray is incident to be subjected to positioning by a horizontal movement; and analyzing device for measuring a light quantity of a fluorescent X-ray generated as the result of the fact that the incident X-ray excites atoms at the wafer surface to analyze a quantity of the metal impurity attached on the wafer surface under the condition that the Bragg reflection causing measurement noises does not take place.
摘要:
The present invention discloses a crystal pulling apparatus having a double-crucible structure, wherein an inner crucible is located in an outer crucible. An end of a pipe-like passage is located in a through hole formed in a side wall of an inner crucible located in an outer crucible, and a melt is supplied from the outer crucible to the inner crucible through the pipe-like passage, during crystal pulling. During melting or neckdown, prior to crystal pulling, diffusion of an impurity between the melts in the outer crucible and the inner crucible, and exchange of the melts between the outer crucible and the inner crucible are prevented by the pipe-like passage.