CRYSTAL GROWTH OF MERCURY CADMIUM TELLURIDE

摘要

PURPOSE:The starting melt is covered with a mixture containing a specific plurality of chlorides to effect crystal growth to form mercury cadmium telluride in good reproducibility under suppression of evaporation of mercury. CONSTITUTION:A base plate 2 of CdTe is placed on the depression of the holder 1 made of carbon and fine particles of Hg2Te, CdTe and Te are placed in the melt pit 4 in the carbon slide port 3 so that the their proportion satisfies the composition of the formula. Then, a mixture of plural halides 5 whose melting point is lower than that of the starting melt is placed on the granules so that the components with lower vapor pressure become more than the higher components. Then, they are heated at 510 deg.C which is high than 500 deg.C, the melting point of the starting material, in an electric furnace to melt the mercury cadmium telluride and the halide mixture in a H2 gas atmosphere so that the melt 6 is covered with the liquefied halide mixture 5. Then, they are rapidly cooled down to 490 deg.C to make the melt 6 in the super-cooling state, and the slide board 3 is allowed to move so that the crystal is allowed to grow on the base 2.