Temperature Variation of Lattice Strain in Slightly Mismatched InGaP/GaAs LPE Layers (0<(Δa/a)\lesssim 0.6%)

Abstract
The variation of the lattice mismatch of InGaP/GaAs (001) layers with temperature (15 \lesssim T \lesssim 600°C) has been measured. The samples had layer thicknesses of 1–2 µm and a room temperature lattice mismatch of 0<(Δ a/a)\lesssim 0.6%. It was found that the critical lattice mismatch for the coherent growth was (Δ a/a)∼0.25% at room temperature. Photoluminescence measurement also supported this result.