Oxygen can be doped into a gallium nitride crystal by preparing a non-C-plane gallium nitride seed crystal, supplying material gases including gallium, nitrogen and oxygen to the non-C-plane gallium nitride seed crystal, growing a non-C-plane gallium nitride crystal on the non-C-plane gallium nitride...http://www.google.de/patents/US7012318?utm_source=gb-gplus-sharePatent US7012318 - Oxygen-doped n-type gallium nitride freestanding single crystal substrate
