Patent ID: 6273946
Filing Date: 2001-08-14
Classification: C30B

Abstract:
In a process for producing a multi-layered epitaxially grown crystal comprising a substrate with multiple layers grown on at least one surface thereof, which process comprises:arranging a plurality of spaced apart crystalline substrates facing each other at intervals with said surface disposed in a substantially vertical direction;successively disposing melts for each of said multiple layers into the intervals between the adjacent crystalline substrates and;performing a liquid-phase epitaxial growth of each of said layers successively on the surface of each substrate,the improvement comprising the steps of:vertically aligning and spacing said crystalline substrates in a concave portion of a central upper member of a substantially cylindrical crystalline substrate holder having a central axis and having a shaft adapted for rotation extending downwardly therefrom;providing fresh melt receptacles and used melt receptacles respectively, for each of said layers, above and below, respectively, said cylindrical crystalline substrate holder, wherein each of said fresh melt and used melt receptacles are stationarily connected to an outside member in rotational relationship to said substrate holder, wherein a multiplicity of fresh melt and used melt reservoirs, respectively, are arranged in said receptacles, respectively, radially about said central axis;rotating said cylindrical crystalline substrate holder, relative to said outside member and to said receptacles, through a series of angular intervals sufficient to successively align a pair of fresh melt and used melt reservoirs, respectively, with a vertically disposed substrate surface;successively supplying melts corresponding to said layers into the intervals between and into effective contact with the surfaces of adjacent crystalline substrates from said fresh melt reservoirs; andsuccessively discharging excess of the melts from said intervals into said used melt reservoir.