Patent ID: 8728234
Filing Date: 2014-05-20
Classification: C30B,H01L

Abstract:
1. A method for growing group III nitride crystals, comprising: (a) growing a first group III nitride ingot on a first seed crystal by an ammonothermal method until a radius of curvature of a c-plane lattice of the group III nitride ingot becomes larger than a radius of curvature of a c-plane lattice of the first seed crystal and until bowing of the c-plane lattice of the first group III nitride ingot along a slicing direction is inverted from a bowing direction of the first seed crystal along the c-plane lattice of the first seed crystal; (b) slicing one or more wafers out of the first ingot along the slicing direction and from a nitrogen polar side of the ingot; (c) using the one or more wafers taken from the nitrogen-polar side of the first ingot as a second seed crystal for subsequent growth of one or more second ingots by the ammonothermal method.