Photoluminescence peculiarities of epitaxial structure with 2DEG layer designed for microwave detectors

Abstract

We use two simple analysis methods to determine quantum efficiency and relative carrier recombination rates in GaAs layers of microwave detector. By means of these methods, we evaluate internal quantum efficiency as a function of pump power and temperature. It does not have the highest value at low temperatures as usual, but increases with temperature and reaches nearly 99% at liquid nitrogen or room temperature depending on pump power.