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A fabrication method of a group III nitride crystal substance includes the steps of cleaning the interior of a reaction chamber by introducing HCl gas into the reaction chamber, and vapor deposition of a group III nitride crystal substance in the cleaned reaction chamber. A fabrication apparatus of

A fabrication method of a group III nitride crystal substance includes the steps of cleaning the interior of a reaction chamber by introducing HCl gas into the reaction chamber, and vapor deposition of a group III nitride crystal substance in the cleaned reaction chamber. A fabrication apparatus of a group III nitride crystal substance includes a configuration to introduce HCl gas into the reaction chamber, and a configuration to grow a group III nitride crystal substance by HVPE. Thus, a fabrication method of a group III nitride crystal substance including the method of effectively cleaning deposits adhering inside the reaction chamber during crystal growth, and a fabrication apparatus employed in the fabrication method are provided.

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1. A fabrication method of a group III nitride crystal substance, the method comprising steps of: cleaning an interior of a reaction chamber by introducing HCl gas into said reaction chamber, andvapor deposition of a group III nitride crystal substance having Si atoms doped in said cleaned reaction

1. A fabrication method of a group III nitride crystal substance, the method comprising steps of: cleaning an interior of a reaction chamber by introducing HCl gas into said reaction chamber, andvapor deposition of a group III nitride crystal substance having Si atoms doped in said cleaned reaction chamber, wherein:said reaction chamber is provided with a gas exhaust pipe and a trap device attached at at least one of an inlet and an outlet of said gas exhaust pipe, and said gas trap device traps ammonium chloride powder generated as by-product during at least one of said step of cleaning of an interior of a reaction chamber and said step of vapor deposition of group III nitride crystal substance. 2. The fabrication method of a group III nitride crystal substance according to claim 1, wherein said group III nitride crystal substance is formed at a region growing at a C-plane. 3. The fabrication method of a group III nitride crystal substance according to claim 2, wherein a sapphire substrate is employed as an underlying substrate in said step of vapor deposition of a group III nitride crystal substance. 4. The fabrication method of a group III nitride crystal substance according to claim 2, wherein any one of a (111) GaAs substrate, a (0001) SiC substrate, and an LiAlGaO substrate is employed as an underlying substrate in said step of vapor deposition of a group III nitride crystal substance. 5. The fabrication method of a group III nitride crystal substance according to claim 2, wherein a GaN substrate is employed as an underlying substrate in said step of vapor deposition of a group III nitride crystal substance. 6. The fabrication method of a group III nitride crystal substance according to claim 1, wherein said group III nitride crystal substrate is grown with controlling the amount of Si doping gas such that a carrier concentration of said group III nitride crystal substance attains predetermined amount. 7. The fabrication method of a group III nitride crystal substance according to claim 6, wherein said Si doping gas is any one of SiH4 gas, SiH2Cl2 gas and SiCl4 gas. 8. The fabrication method of a group III nitride crystal substance according to claim 1, wherein a reactor tube constituting said reaction chamber is a quartz reactor tube.