Patent ID: 8916458

Claim:
A method for manufacturing an III-nitride quantum well structure by controlling ratios among a first beam equivalent pressure of nitrogen, a second beam equivalent pressure of gallium and a third beam equivalent pressure of indium, comprising: maintaining a substrate in a first growth temperature; adjusting a ratio of the first beam equivalent pressure to the second beam equivalent pressure as 91 so that a gallium nitride buffering layer is grown on the substrate by epitaxy; maintaining the substrate in the first growth temperature; adjusting the ratio of the first beam equivalent pressure to the second beam equivalent pressure as 163, so that a gallium nitride post is grown on the gallium nitride buffering layer by epitaxy and a gallium nitride pyramid is formed on the gallium nitride post by epitaxy; reducing a temperature of the substrate to a second growth temperature; adjusting a ratio of the first beam equivalent pressure to the third beam equivalent pressure as 4.99:1.19; adjusting a ratio of the third beam equivalent pressure to the second beam equivalent pressure as 1.19:1, so that an indium gallium nitride layer is grown on the gallium nitride pyramid; maintaining the substrate in the second growth temperature; and adjusting the ratio of the first beam equivalent pressure to the second beam equivalent pressure as 300 to 600, so that a gallium nitride covering layer is grown on the indium gallium nitride layer.