The temperature dependence of electrical and optical properties in InAs/GaAs and GaAs/InAs/AlAs self-assembled quantum dots

Abstract

In this paper, we report on the effects of the environment on the properties of an ensemble of InAs self-assembled quantum dots. The properties presented by the electrons confined at the dots can be tuned by adjusting some parameters of the environment. Using capacitance–voltage and photoluminescence measurements, we observed an increase in the thermal stability of zero-dimensional electron gas when the dots were grown in a period of a GaAs/AlAs superlattice. We believe that the parameter responsible for the thermal stability observed here was the increase of the electrical impedance of the device. In addition, electrical and optical measurements enabled us to study the thermal stability of electrons located at the dots grown in the GaAs bulk and in the aforementioned superlattice.