Abstract
Lead-based (IV–VI) colloidal quantum dots (QDs) are of widespread scientific and technological interest owing to their size-tunable band-gap energy in the near-infrared optical region. This article reviews the synthesis of PbSe-based heterostructures and their structural and optical investigations at various temperatures. The review focuses on the structures consisting of a PbSe core coated with a PbSexS1–x (0 ≤ x ≤ 1) or CdSe shell. The former-type shells were epitaxially grown on the PbSe core, while the latter-type shells were synthesized using partial cation-exchange. The influence of the QD composition and the ambient conditions, i.e., exposure to oxygen, on the QD optical properties, such as radiative lifetime, Stokes shift, and other temperature-dependent characteristics, was investigated. The study revealed unique properties of core/shell heterostructures of various compositions, which offer the opportunity of fine-tuning the QD electronic structure by changing their architecture. A theoretical model of the QD electronic band structure was developed and correlated with the results of the optical studies. The review also outlines the challenges related to potential applications of colloidal PbSe-based heterostructures.
Highlights
For over a decade, lead chalcogenide (PbTe, PbSe, PbS) colloidal quantum dots (QDs) have been the focus of widespread scientific and technological interest [1,2,3,4]
We have recently reported a theoretical study of the properties of alloyed PbSe/PbSexS1–x core/shell colloidal QDs, which shows the variability of the electronic properties in all alloyed heterostructures with elemental composition, modification of the exciton-phonon interaction, direct Coulomb and exchange interactions [74,90,95]
The results demonstrate that the produced PbSe/PbSexS1–x (0 ≤ x ≤ 1) and PbSe/CdSe heterostructures are characterized by relatively narrow emission bands, longer excited-state lifetimes, and higher stability towards oxidation for a restricted period of time
Summary
Lead chalcogenide (PbTe, PbSe, PbS) colloidal quantum dots (QDs) have been the focus of widespread scientific and technological interest [1,2,3,4]. We have recently reported a theoretical study of the properties of alloyed PbSe/PbSexS1–x core/shell colloidal QDs, which shows the variability of the electronic properties in all alloyed heterostructures with elemental composition, modification of the exciton-phonon interaction, direct Coulomb and exchange interactions [74,90,95]. Additional details of this one and the other recent theoretical work are presented below.
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