Patent ID: 9391237
Filing Date: 2016-07-12
CPC Classification: H01L

Claim Text:
1. A method for producing a Group III nitride semiconductor light-emitting device having a first p-type contact layer formed of GaN doped with Mg, and a second p-type contact layer formed of GaN doped with Mg at a concentration higher than that of the first p-type contact layer on the first p-type contact layer, the method comprising the steps of: forming the first p-type contact layer of GaN with a thickness in a range from 10 nm to 300 nm and a Mg concentration in a range from 8×10 stopping supplies of the trimethylgallium, the bis(cyclopentadienyl)magnesium, and the hydrogen after a completion of the forming of the first p-type contact layer and keeping a flow rate of the ammonia at the same value as in the forming of the first p-type contact layer; lowering a temperature to a growth temperature for the second p-type contact layer in an ammonia atmosphere after the completion of the forming of the first p-type contact layer and before starting to form the second p-type contact layer; starting supplies of nitrogen as a carrier gas, the trimethylgallium, and the bis(cyclopentadienyl)magnesium; forming the second p-type contact layer with a thickness in a range from two monolayers to 50 Å and a Mg concentration in a range from 5×10 forming a transparent electrode on the second p-type contact layer; wherein the second p-type contact layer is formed at a growth rate of 0.03 times to 0.1 times the growth rate of the first p-type contact layer by decreasing a flow rate of the trimethylgallium for the forming of the second p-type contact layer lower than a flow rate of the trimethylgallium for the forming of the first p-type contact layer.