Influence of reaction conditions on the growth of GaN rods in an ammono-CVD reactor

✍ Scribed by Gregorio Guadalupe Carbajal Arízaga; Gerardo Soto Herrera; Alec M. Fischer; Oscar Edel Contreras López

• Book ID: 104022365
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 842 KB
• Volume: 319
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2011.01.103

✦ Synopsis

GaN was deposited onto a sapphire substrate covered by gold film to favor formation of rods in a chemical vapor deposition reactor. Sublimation of NH 4 Cl was used to transfer gallium to the vapor phase and it was then reacted with NH 3 . A factorial design experiment was used to study three parameters: substrate temperature, ammonia flow and temperature applied to NH 4 Cl. Results showed that the three parameters interact with each other with respect to the lateral growth of GaN, e.g. the rise in substrate temperature can either increase or reduce the lateral growth depending on the NH 4 Cl treatment temperature. Similarly, the catalytic effect of gold on GaN rods depends on the three studied parameters. These interactions cannot be observed in univariate experiments. Optimal conditions to produce GaN rods were a substrate temperature of 800 1C, ammonia flow of 180 sccm and 300 1C applied to NH 4 Cl. The V/III ratio was a dominant factor in lateral growth, and this is controlled simultaneously with the three parameters studied.