Patent ID: 8003421

Claim:
A method for manufacturing a compound semiconductor substrate, including at least the processes of epitaxially growing a quaternary light emitting layer composed of AlGaInP on a GaAs substrate; vapor-phase growing a p-type GaP window layer on one of main surfaces (a first main surface) of the quaternary light emitting layer, the first main surface being opposite to the GaAs substrate; removing the GaAs substrate; and epitaxially growing an n-type GaP window layer on the other main surface (a second main surface) of the light emitting layer, the second main surface being located at a side where the GaAs substrate is removed; wherein the method comprising the process of performing a heat treatment under a hydrogen atmosphere containing ammonia after the process of removing the GaAs substrate and before the process of epitaxially growing the n-type GaP window layer.