Patent ID: 8323404

Claim:
A method for manufacturing a group III nitride crystal on a base body by using a crystal growth apparatus, said crystal growth apparatus comprising a reaction vessel holding a melt mixture of an alkali metal and a group III metal, said method comprising: a first step of loading said alkali metal and said group III metal into said reaction vessel in an inert gas ambient or a nitrogen gas ambient; a second step of filling said vessel space of said reaction vessel with a nitrogen source gas; a third step of heating said reaction vessel to a crystal growth temperature; a fourth step of growing a first group III nitride crystal on said base body, such that said first group III nitride crystal deflects threading dislocations in a direction different from a crystal growth direction from said base body; a fifth step of growing a second group III nitride crystal having a crystal growth surface generally perpendicular to said crystal growth direction such that at least a part of said second group III nitride crystal makes a contact with said first group III nitride crystal; and a sixth step of supplying said nitrogen source gas to said reaction vessel such that a pressure inside said vessel space is maintained; wherein said fourth step causes crystal growth of said first group III nitride crystal such that said first group III nitride crystal has a crystal growth surface different from a c-surface or a plane parallel to a c-axis, and said fifth step causes said crystal growth of said second group III nitride crystal by adding an additive different from any of said alkali metal and said group III metal to said melt mixture.