摘要:
Disclosed is a compound semiconductor material with excellent performance and its utilization. The compound semiconductor may be expressed by Chemical Formula 1 below: M1aCo4Sb12-xM2x Chemical Formula 1 where M1 and M2 are respectively at least one selected from In and a rare earth metal element, 0≦a≦1.8, and 0≦x≦0.6.
摘要:
A novel gallium arsenide precursor has the formula R.sub.2 GaAs(SiR').sub.2 wherein R is selected from the group consisting of alkyl substituted cycloaliphatic group and alkyl substituted aromatic group and R' is alkyl. Preferably, R is pentamethylcyclopentadienyl and R' is methyl. The precursor is reacted with an alcohol, preferably ethanol or t-butanol at a temperature ranging from -20.degree. C. to 60.degree. C., preferably at room temperature, under water free conditions to form solid gallium arsenide and by-products which are liquid under the reaction conditions. The gallium arsenide forming reaction may be aided by a catalyst providing amount of a substance which is considered to react with excess alcohol reactant to generate a catalytic amount of HCl, e.g., (CH.sub.3).sub.3 SiCl or [R(Cl)GaAs(SiR'.sub.3).sub.2 ].sub.n wherein R is pentamethylcyclopentadienyl and R' is methyl and in solution in benzene n is 1 and 3.
摘要:
The dislocation density near the surface of Hg.sub.1-x Cd.sub.x Te alloys is substantially reduced by annealing the material at around 600.degree. C. in a mercury saturated ambient for periods of four hours or more, prior to post annealing at lower temperatures to control the metal vacancy concentration. This procedure allows dislocation reduction by climb, reduces the concentration of metal vacancies which can collapse to form dislocation loops or contribute to dislocation multiplication, and reduces tellurium precipitates which contribute to dislocation multiplication during subsequent post annealing.
摘要:
A method for manufacturing a thin and flexible ribbon wafer of semiconductor material such as germanium, silicon, selenium, tellurium, PbS, InSb, ZnTe, PbSe, InAs, InP, GaSb, PbTe, ZnS, Bi.sub.2 Te.sub.3, and mixtures thereof comprises melting the semiconductor material at a temperature within the range from a melting point thereof to 300.degree. C. above the melting point to form a uniform melt; ejecting under a pressure the melt through a nozzle against a cooling surface of a moving substrate to cool very rapidly a jet flow of the melt at a cooling rate of 1,000.degree. C. to 1,000,000.degree. C./sec to form the ribbon type thin and flexible wafer of fine and compact microscopic structure having a large mechanical strength and an excellent electrical property. It is possible to add to the melt various additives as fluxes or impurities such as B, P, BP, Sb Sn, As, B, P, Sb, In, Al and alloys intermetallic compounds, and conjugates thereof. The thin ribbon wafer as grown is preferably heated at a temperature from within the range 500.degree. C. to the melting point for a time within the range from 0.1 second to one week. The invention also provides a thin and flexible ribbon wafer of semiconductor material manufactured by the above mentioned process.
摘要:
Herein disclosed are apparatuses for manufacturing compound semiconductor polycrystals comprising a pressure vessel, an upper shaft, a container for a first component fixed to the upper shaft, a heater around the container, a lower shaft, a susceptor and a crucible for charging a second component, a heater for the crucible and a communicating pipe for spatially connecting the container and the crucible optionally provided with a porous member at the lower extremity and/or a cylindrical member for confining a space over a part of the melt surface contained in the crucible from the remaining inner space of the vessel, the apparatuses permitting the substantial reduction of the reaction time and an improvement of the yield of the polycrystals due to the presence of the porous member and/or the cylindrical member separating the inner space of the vessel into two portions.
摘要:
The problem of CdTe sticking to quartz boats is avoided by preventing any presence of cadmium oxides in the as-compounded CdTe. This is accomplished by distilling the cadmium under a high vacuum immediately prior to the CdTe compounding step.
摘要:
The invention relates to a method for the synthesis of a semiconductor compound comprising at least one element of column III of the periodic table of Mendeleev, and an element of column V having a vapor pressure higher than that of element(s) III at the synthesis temperature of the said compound, and according to which, in a closed space, a liquid mass of element(s) III, placed in a first zone of said space which is heated at relatively high temperatures and is contacted with vapors obtained by evaporation of element V, said element V being placed in a second zone of the said space in a non-gaseous form, the evaporation temperature of element V being higher than that of the coldest point provided in a third zone of the said space, and the said first zone being situated between the second and the third zone.