Abstract

A review devoted to the theory of excitonic quasimolecules (Biexcitons) (formed of spatially separated electrons and holes) in a nanosystems that consists of semiconductor and dielectric quantum dots synthesized in a dielectric matrix. It is shown that exciton quasimolecules formation is of the threshold character and possible in nanosystems, in with the spacing between the quantum dots surfaces is larger than a certain critical spacing. It was found that the binding energy of singlet ground state of exciton quasimolecules, consisting of two semiconductor quantum dots is a significant large values, larger than the binding energy of the biexciton in a semiconductor single crystal almost two orders of magnitude.

Highlights

  • The idea of superatom was fruitful for the development of nanophysics [1,2,3] Superatom consists of a spherical quantum dot (QD) with radius a, the volume of that contains the semiconductor material

  • During investigation of the optical characteristics of nanosystems with CdS, ZnSe, Al2O3 and Ge quantum dots in experimental papers [4,5,6,7,8] it was found that the electron can be localized above the surface of the QD while the hole here moves in the volume of the QD

  • A substantial increase in the bond energy of the ground state of an electron in a super atom in comparison with the bond energy of an exciton in CdS, ZnSe and Al2O3 and single crystals was detected in Ref. [2,3,4,5,6,7,8,9,10]

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Summary

Introduction

The idea of superatom was fruitful for the development of nanophysics [1,2,3] Superatom (quasiatomic nanoheterostructures) consists of a spherical quantum dot (QD) with radius a, the volume of that contains the semiconductor (or dielectric) material. During investigation of the optical characteristics of nanosystems with CdS, ZnSe, Al2O3 and Ge quantum dots in experimental papers [4,5,6,7,8] it was found that the electron can be localized above the surface of the QD while the hole here moves in the volume of the QD. In order to explain the optical characteristics of such nanosystems we proposed a model of a quasimolecules representing two ZnSe and CdS QDs that form an exciton quasimolecule as a result of the interaction of electrons and holes [3,11,12,13,14] The review deals with the theory of excitonic quasimolecules (biexcitons) (formed of spatially separated electrons and holes) in a nanosystems that consists of semiconductor quantum dots synthesized in a borosilicate glass matrix. It was found that the binding energy of singlet ground state of exciton quasimolecule, consisting of two semiconductor quantum dots is a significant large values, larger than the binding energy of the biexciton in a semiconductor single crystal almost two orders of magnitude

Binding Energy of Singlet Ground State of Excitonic Quasimolecule
QD with
The binding energies
Conclusion
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