METHOD FOR CONTROLLING TEMPARATURE GRADIENT IN ACCORDING WITH INCREASING THE LENGTH OF SINGLE CRYSTIL BY VB

摘要

The method in characterized in that the length of mono-crystal is increased by increasing the T5 value by means of changing the temperature(Th) of the high temperature portion into a first lower temperature(Th') as well as changing the temperature(Tc) of the low temperature portion into a second lower temperature(Tc') in a state maintaining the same temp. gradient and crystal growth speed as the higher temperature(Th) than the m.p. of GaAs and the lower temperature(Tc) than the m.p. of GaAs.