摘要:
A method of impurity doping into a semiconductor, which comprises irradiating energy rays such as excimer laser beam (or UV-rays) to a predetermined region of a hydrogen terminated silicon surface to remove hydrogen atom layers terminating the silicon surface thereby forming a patterned silicon surface region not terminated with hydrogen and selectively adsorbing impurities on the silicon surface region not terminated with hydrogen, to conduct impurity doping. When such an impurity doping method is adopted, junctions having shallow and abrupt distribution for use in a miniaturized MOSFET or the like can be attained with a lesser number of the steps. Since the impurity doping process can be constituted as a clean and all dry in-situ process without using photoresist at all, it can also provide advantageous effect in view of enhanced yield and shortened production period.
摘要:
A method of producing a hetero structure, including the steps of depositing hydrogen atoms or halogen atoms onto a surface of a first single crystal layer formed of semiconductor or metal silicide, and forming a second single crystal layer on the first single crystal layer by hetero epitaxial growth, the second single crystal layer being formed of semiconductor or metal silicide different from the material of the first single crystal layer, wherein both of the steps are continuously conducted without taking the hetero structure out of a producing device. Further, the number of the hydrogen atoms or the halogen atoms to be deposited is equal to or in the range of .+-.50% with reference to the number of dangling bonds existing in a hetero interface between the first single crystal layer and the second single crystal layer, so that the lattice defects in the hetero interface can be reduced.
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 porous membrane which is composed of cellulose acetate and acrylic polymer, for example, poly(methyl methacrylate) or methyl acrylate-methyl methacrylate copolymer, is highly suitable for plasmapheresis. A polymer alloy consisting of cellulose acetate, acrylic polymer and a small amount of cellulose nitrate has a good spinnability to produce a hollow fiber type membrane and has an excellent biocompatibility.