Fig. 3From: Detecting Spatially Localized Exciton in Self-Organized InAs/InGaAs Quantum Dot Superlattices: a Way to Improve the Photovoltaic EfficiencySecond derivative spectrum of imaginary part (ϵ 2) of dielectric function as function of the photon energy for the InAs/InGaAs QD heterostructure. The transition energies arising from InAs QD layers and GaAs layers are indicated [10]Back to article page