Abstract:
Large-area (up to 100 cm$^2$) crystalline gallium nitride slabs have been produced by vapor-phase deposition on a ceramic support coated with hexagonal boron nitride. The material was characterized upon grinding and polishing of samples cut from the slabs. It was found that the slab material is an n-type semiconductor with optical, thermal, and mechanical properties close to those of single-crystal gallium nitride produced by other growth techniques.