Abstract: The disclosed subject matter includes a method of producing zinc oxide (ZnO) single crystals in an enclosure. The ZnO single crystals have a low concentration of lithium and hydrogen impurities.

Abstract: The disclosed subject matter includes a method of producing zinc oxide (ZnO) single crystals in an enclosure. The ZnO single crystals have a low concentration of lithium and hydrogen impurities.

Abstract: A crystal growth setup within a physical vapor transport growth furnace system for producing AlN monocrystal boules at high temperatures includes a crucible effective to contain an AlN source material and a growing AlN crystal boule. This crucible has a thin wall thickness in at least that portion housing the growing AlN crystal boule. Other components include a susceptor, in case of an inductive heating, or a heater, in case of a resistive heating, a thermal insulation enclosing the susceptor or heater effective to provide a thermal gradient inside the crucible in the range of 5-100° C./cm and a furnace chamber capable of being operated from a vacuum (<0.1 torr) to a gas pressure of at least 4000 torr through filling or flowing a nitrogen gas or a mixture of nitrogen gas and argon gas. The high temperatures contribute to a high boule growth rate and the thin wall thickness contributes to reduced imparted stress during boule removal.