Progress in bulk GaN growth*
Xu Kea),b)†, Wang Jian-Fenga),b), Ren Guo-Qianga),b)
       
(a) 2-inch and (b) 4-inch GaN crystals grown on HVPE-GaN seed crystals by Na-flux method (from Ref. [ 80 ]), (c) morphology of 2-inch coalesced GaN crystal (from Ref. [ 85 ]).