Quantum dots: Structures, properties, and application
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In this dissertation, we investigate the properties of colloidal and self-assembled semiconductor QDs, which are formed in structurally different matrixes: liquid and solid. We present nanosecond photoluminescence processes in colloidal core CdSe, core/shell CdSe/ZnS nanoparticles dissolved in different solvents such as water, toluene, and decane. Also, we found strong sensitivity of luminescence to the solvent or/and capping layer state. The observed effects are associated with the reconstruction of capping molecules near its or/and solvent phase transition. Next, in this work we present direct experimental demonstration of strong effects of potential barriers on photoresponse of QD structures. To investigate effect of potential barriers on photoelectron kinetics, we fabricated several QD structures with different positions of dopants and various levels of doping. The potential barriers as a function of doping and dopant positions have been determined using nextnano 3 software. We experimentally investigated the photoresponse to IR radiation as a function of the radiation frequency and voltage bias.