摘要:
A desired part of a workpiece is irradiated with a focused ion beam which contains at least two species of impurity ions to-be-implanted exhibiting different spacial distributions of ion current densities.Thus, regions respectively implanted with different species of impurity ions can be formed in a predetermined positional relationship at high precision.
摘要:
Of an amorphous Si film, a region to be formed into a lowly doped region such as the channel region of an MOS transistor is covered with a mask and an uncovered region is doped with an impurity. After this, the amorphous Si film is annealed and turned to signal crystal through solid phase epitaxial growth, and the mask itself is used as the electrode of a semiconductor device. By this impurity doping, a large-sized single-crystal Si film can be formed, and the impurity doping can be conducted in self-alignment with the electrode formation to produce a highly integrated semiconductor circuit.
摘要:
A field effect transistor formed on a semi-insulator or compound semiconductor substrate comprises a first semiconductor layer forming a source region, a drain region and a channel layer, and a second semiconductor layer having a reverse conduction type to that of the first semiconductor layer. The second semiconductor layer is doped so that it will be totally depleted. Therefore, a portion of the second semiconductor layer adjacent to the substrate will remain conductive. The field effect transistor with this structure prevents the short channel effect and the soft error due to .alpha.-particles. A threshold voltage control arrangement is also provided using the feature of a control electrode coupled to the second semiconductor layer and a feedback arrangement.
摘要:
Technology for using a wiring of a superconductive material in semiconductor integrated circuit device. An isolation layer and/or a barrier layer are provided for preventing diffusion of harmful composition of the superconductive material for the semiconductor device. Control of a circuit can be made utilizing the characteristics of a superconductive material. Also, the characteristics of a superconductive material may be controlled. A method of forming a layer of superconductive material, well compatible with the widely used process of manufacturing integrated circuit devices, is also disclosed.
摘要:
Ions having a high energy is implanted using a mask of a stacked film consisting of a film formed from an amorphous material and a film formed from a metal having a large mass number.In this way, penetration of ions can be prohibited by a mask having a far smaller thickness than that of the conventional mask. Thus ions having a high energy can be implanted with a very high accuracy.
摘要:
An insulating film is formed on a semiconductor substrate, and the insulating film on that part of the semiconductor substrate where an emitter is to be formed, is removed to expose the surface of the above part. A polycrystalline or amorphous silicon film is deposited on the entire surface, and then irradiated with a laser beam to convert that portion of the polycrystalline or amorphous silicon film which is deposited on the surface of the semiconductor substrate without interposing the insulating film therebetween, into a single crystal of silicon, thereby forming a stacked emitter.
摘要:
A region containing a high concentration of impurity and a desired region adjacent thereto are fused by irradiation with a laser beam, to diffuse the impurity in the lateral direction into the desired region and to render the desired region a low resistance.Since this method can execute only the lateral diffusion of the impurity without affecting other portions, it is very useful for forming a high breakdown voltage MIS-FET, a resistor etc.
摘要:
First conductivity type impurity ions are implanted at a predetermined depth all over a region where impurity ions are to be implanted, and second conductivity type impurity ions are implanted in a dose about twice as large as that of the first conductivity type impurity ions at substantially the same implantation depth of the first conductivity type impurity ions, followed by annealing.In this way, mutually contiguous first and second conductivity type regions having substantially the same impurity concentrations and located at substantially the same depths are formed.
摘要:
A polycrystalline silicon film is implanted with an impurity in large amounts and is heated to be annealed, whereupon it is irradiated with a laser beam to be annealed.Thus, a polycrystalline silicon film of very low resistivity consisting of a second layer whose activated impurity concentration is equal to or below a solid solubility and a first layer whose activated impurity concentration is above the solid solubility is formed.