Thermoreflectance studies of thin epitaxially deposited (InGa)P alloys

Abstract

Thermoreflectance measurements have been made on a series of (InGa)P epitaxial layers. The direct spin-orbit optical transitions are observed at all concentrations. The indirect transition is seen in the indirect gap material, which occurs about 65 mol.% GaP, through a process involving thermotransmission through the layer and a reflection at the substrate.