Abstract
Zinc oxide (ZnO) bulk single crystals were grown by the hydrothermal method, which has been used for the synthesis of quartz single crystals. We evaluated crystallinity, impurit concentration, electric and optical characteristics of ZnO single crystals. The impurity concentration of ZnO was different in each crystal area. Because of that, the electric characteristic was different in the crystal area. And recently we succeeded in the growth of 2inch non-polar ZnO single crystals substrates for the green LED.
