Patent ID: 8629065

Claim:
A method of growing a planar non-polar Gallium-Nitride epitaxial film, comprising: providing an m-plane sapphire substrate; cleaning and annealing the m-plane sapphire substrate in a hydrogen environment at a temperature of approximately 900° C. for a duration of approximately 10 to 20 minutes; nitridizing the annealed m-plane sapphire substrate in an ammonia environment at a temperature of approximately 600° C. for approximately 3 to 10 minutes; growing an intermediate layer of Aluminum Nitride (AlN) or Aluminum Gallium Nitride (AlGaN) at a temperature of approximately 600° C. on the nitridized and annealed m-plane sapphire substrate for approximately 30 seconds; increasing the temperature in an atmosphere of ammonia and hydrogen by approximately 15° C. per minute for 30 minutes to effect the recrystallization of the intermediate layer; and growing non-polar m-plane Gallium-Nitride on the intermediate layer at a temperature of approximately 1040° C. using hydride vapor phase epitaxy (HVPE).