Physical properties of bulk single-crystal wafers of gallium nitride

A study has been performed of the crystalline structure and optical characteristics of single crystals of gallium nitride (GaN). The crystals were grown from a gallium-based flux. X-ray structural analysis showed that the crystals have wurzite structure 2H-GaN. From their luminescence characteristics and optical absorption spectra the crystals are similar to 2H-GaN epitaxial layers described in the literature.