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Volume 3, Issue 6-1
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Oct. 31, 2014
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Home / Journals / Optics / Optics and Spectroscopy of the Charge Carriers and Excitons States in Quasi - Zero - Dimensional Nanostructures
Optics and Spectroscopy of the Charge Carriers and Excitons States in Quasi - Zero - Dimensional Nanostructures
Lead Guest Editor:
Sergey  Pokutnyi
Chuiko Institute of Surface Chemistry NASU, Kyiv, Ukraine
Paper List
1
Authors: Sergey I. Pokutnyi
Pages: 1-1 Published Online: Jul. 31, 2014
Views 3285 Downloads 89
2
Authors: Sergey I. Pokutnyi
Pages: 2-9 Published Online: Jul. 31, 2014
Views 3143 Downloads 81
3
Authors: Sergey I. Pokutnyi
Pages: 10-21 Published Online: Jul. 31, 2014
Views 2997 Downloads 71
4
Authors: Vladimir P. Dzyuba, Yurii N. Kulchin, Sergey I. Pokutnyi
Pages: 22-37 Published Online: Jul. 31, 2014
Views 2833 Downloads 88
5
Authors: Sergey I. Pokutnyi, Petr P. Gorbyk
Pages: 38-41 Published Online: Oct. 25, 2014
Views 2723 Downloads 84
6
Authors: Sergey I. Pokutnyi, Petr P. Gorbyk
Pages: 42-47 Published Online: Oct. 25, 2014
Views 2721 Downloads 85
7
Authors: Sergey I. Pokutnyi
Pages: 48-52 Published Online: Oct. 25, 2014
Views 2522 Downloads 54
8
Authors: Sergey I. Pokutnyi
Pages: 53-56 Published Online: Oct. 25, 2014
Views 2688 Downloads 62
9
Authors: Sergey I. Pokutnyi, Oksana V. Naumenko
Pages: 57-60 Published Online: Oct. 25, 2014
Views 2402 Downloads 119
Introduction

The review analyzes the results of theoretical investigations of excitons states (electron - hole pairs states) in a quasi - zero - dimensional nanosystems consisting of spherical semiconductor nanocrystals (quantum dots) placed in transparent dielectric matrices. The theory of exciton states in a quantum dot under conditions of dominating polarization interaction of an electron and a hole with a spherical (quantum dot – dielectric matrix) interface are developed. An shown, that the energy spectrum of heavy hole in the valence band quantum dot is equivalent to the spectrum of hole carrying out oscillator vibrations in the adiabatic electron potential. In the framework of the dipole approximation theory are developed interband absorption of light in quasi – zero – dimensional nanosystems. An shown, that the absorption and emission edge of quantum dots is formed by two transitions of comparable intensity from different hole size – quantization levels and into a lower electron size – quantization level. Propose a theoretical prospect of using hole transitions between equidistant series of quantum levels observed in nanocrystals for desining a nanolaser. The theory of an exciton formed from spatially separated electron and hole (the hole is in the quantum dot volume, and the electron is localized at the outer spherical quantum dot–dielectric matrix interface) is developed within the modified effective mass method. The effect of significantly increasing the exciton binding energy in quantum dots of zinc selenide, synthesized in a borosilicate glass matrix, relative to that in a zinc selenide single crystal is revealed. We developed the theory of a biexcitons formed from spatially separated electrons and holes (the hole is in quantum dot volume, and the electron is localized at the outer surface of the quantum dot – dielectric matrix interface) in a nanosystem that consists of zinc selenide quantum dots synthesized in a glassy matrix.


The theoretical model of transmission spectrum of dielectric nanoparticles ensemble is presented. This model describes the dependence of the transmission spectrum on bot hof the particles size and the radiation frequency.This basis of the model is: the energy gap of the nanoparticle material contains energy levels, that is caused by the presence of a great number of defects of the nanoparticles crystal structure; the quantization of the charge carriers and excitons states. The theoretical model is compared with experimental results on the transmission spectrum.

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