Composition Dependence of the Ga1−xAlxAs Direct and Indirect Energy Gaps

Abstract

Photoresponse measurements were made to determine the compositional dependence of the Ga_1−xAl_xAs direct Γ₁₅→Γ₁ and indirect Γ₁₅→X₁ energy gaps. These data, together with other information, show that the crossover composition and energy gap are between 0.35<x_cE_gc<1.97 eV, and that the most resonable values are 0.37 and 1.92 eV.