Catalytic growth of high quality GaN micro-crystals

Growth of GaN crystals from the vapor phase

“…They are made mainly by solution growth and vapor phase growth. The former method is used to synthesize relatively large bulk GaN crystals under high temperatures and pressures of N 2 or NH 3 gas, while the latter is appropriate for the production of GaN nanowires or nano-rods/crystals by sublimation of GaN [2,3] or gas phase reaction of Ga [2][3][4][5] or Ga 2 O [6,7] with NH 3 . Direct reaction of Ga vapor from the melt with NH 3 occasionally produces crystals of GaN together with amorphous powder, but may be complicated by the formation of a GaN crust on the Ga melt, preventing further reaction.…”

Synthesis and characterization of Zn-doped GaN crystals by simultaneous carbothermal reduction and nitridation of Ga2O3 and ZnO

“…Many papers appeared in relation to the synthesis of good quality GaN powder by reaction of Ga or Ga 2 O 3 with NH 3 or by ammonolysis of Ga 2 O gas formed by reduction of Ga 2 O 3 with either metallic Ga or C [9][10][11][12]. Rapid synthesis of high purity GaN powder using a catalyst such as Bi, Ni, or Ti has also been reported [13][14][15]. Hong et al prepared Zn-doped GaN powder as blueemitting phosphors from Ga and Zn nitrate solutions by aerosol pyrolysis and observed a broad emission band at $440 nm [16].…”

Synthesis and Characterization of Ge-Doped GaN Crystalline Powders Deposited on Graphite and Silica Glass Substrates

“…Several authors including us have investigated the crystal growth of GaN by the reaction of NH 3 with Ga 2 O gas formed by the carbothermal reduction of Ga 2 O 3 . − These studies have been most concerned with the synthesis of nanosized GaN crystals, in contrast to the present authors, who produced millimeter-sized GaN single crystals by the above-mentioned carbothermal reduction and ammonolysis of Ga 2 O 3 . The rapid synthesis of high-purity GaN powder using a catalyst has recently been reported. − Catalysts such as Bi, Ni, or Ti are noted as enhancing the formation of GaN by the reaction of Ga 2 O 3 with NH 3 .…”

“…14 The rapid synthesis of high-purity GaN powder using a catalyst has recently been reported. [15][16][17] Catalysts such as Bi, Ni, or Ti are noted as enhancing the formation of GaN by the reaction of Ga 2 O 3 with NH 3 .…”