Hot exciton relaxation in coupled ultra-thin CdTe/ZnTe quantum well structures

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Hot exciton relaxation in coupled ultra-thin CdTe/ZnTe quantum well structures. / Agekyan, V. ; Budkin, G. ; Chukeev, M. ; Filosofov, N. ; Karczewski, G.; Serov, A. ; Reznitsky, A. .

In: Journal of Luminescence, Vol. 230, 117762, 01.02.2021.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{78e8afdb031e43dfbd959a838f899435,

title = "Hot exciton relaxation in coupled ultra-thin CdTe/ZnTe quantum well structures",

abstract = "The photoluminescence (PL) and PL excitation (PLE) spectra of CdTe/ZnTe asymmetric double quantum well (QW) structures are studied on a series of samples containing two CdTe layers with nominal thicknesses of 2 and 4 monolayers (ML) in the ZnTe matrix. The samples differ in the thickness of the ZnTe spacer between CdTe QWs which is 45, 65 and 75 ML. It has been found that at above-barrier excitation the PL from a shallow QW at sufficiently weak excitation intensities is determined by recombination of hot excitons. It is shown that under these conditions, when PL is excited by lasers with different wavelengths, the ratio of the PL intensities from shallow and deep QWs decreases exponentially with an increase of the initial kinetic energy of hot excitons. It is found that energy relaxation of hot excitons with LO phonon emission determine the shape of the PLE spectrum of shallow QW in the range of exciton kinetic energies up to more than 20 LO phonons above ZnTe bandgap. We have shown that the results obtained are well described by the model of charge and energy transfer between QWs.",

keywords = "Asymmetric double quantum wells, Cadmium telluride, Zinc telluride, Photoluminescence, Hot exciton relaxation, Asymmetric double quantum wells, Cadmium telluride, Zinc telluride, photoluminescence, Hot exciton relaxation, Photoluminescence, RAMAN-SCATTERING, RESONANCE, OPTICAL-PROPERTIES, BINDING-ENERGIES, DOTS, BEHAVIORS",

author = "V. Agekyan and G. Budkin and M. Chukeev and N. Filosofov and G. Karczewski and A. Serov and A. Reznitsky",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier B.V.",

year = "2021",

month = feb,

day = "1",

doi = "10.1016/j.jlumin.2020.117762",

language = "English",

volume = "230",

journal = "Journal of Luminescence",

issn = "0022-2313",

publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Hot exciton relaxation in coupled ultra-thin CdTe/ZnTe quantum well structures

AU - Agekyan, V.

AU - Budkin, G.

AU - Chukeev, M.

AU - Filosofov, N.

AU - Karczewski, G.

AU - Serov, A.

AU - Reznitsky, A.

PY - 2021/2/1

Y1 - 2021/2/1

N2 - The photoluminescence (PL) and PL excitation (PLE) spectra of CdTe/ZnTe asymmetric double quantum well (QW) structures are studied on a series of samples containing two CdTe layers with nominal thicknesses of 2 and 4 monolayers (ML) in the ZnTe matrix. The samples differ in the thickness of the ZnTe spacer between CdTe QWs which is 45, 65 and 75 ML. It has been found that at above-barrier excitation the PL from a shallow QW at sufficiently weak excitation intensities is determined by recombination of hot excitons. It is shown that under these conditions, when PL is excited by lasers with different wavelengths, the ratio of the PL intensities from shallow and deep QWs decreases exponentially with an increase of the initial kinetic energy of hot excitons. It is found that energy relaxation of hot excitons with LO phonon emission determine the shape of the PLE spectrum of shallow QW in the range of exciton kinetic energies up to more than 20 LO phonons above ZnTe bandgap. We have shown that the results obtained are well described by the model of charge and energy transfer between QWs.

AB - The photoluminescence (PL) and PL excitation (PLE) spectra of CdTe/ZnTe asymmetric double quantum well (QW) structures are studied on a series of samples containing two CdTe layers with nominal thicknesses of 2 and 4 monolayers (ML) in the ZnTe matrix. The samples differ in the thickness of the ZnTe spacer between CdTe QWs which is 45, 65 and 75 ML. It has been found that at above-barrier excitation the PL from a shallow QW at sufficiently weak excitation intensities is determined by recombination of hot excitons. It is shown that under these conditions, when PL is excited by lasers with different wavelengths, the ratio of the PL intensities from shallow and deep QWs decreases exponentially with an increase of the initial kinetic energy of hot excitons. It is found that energy relaxation of hot excitons with LO phonon emission determine the shape of the PLE spectrum of shallow QW in the range of exciton kinetic energies up to more than 20 LO phonons above ZnTe bandgap. We have shown that the results obtained are well described by the model of charge and energy transfer between QWs.

KW - Asymmetric double quantum wells

KW - Cadmium telluride

KW - Zinc telluride

KW - Photoluminescence

KW - Hot exciton relaxation

KW - Asymmetric double quantum wells

KW - Cadmium telluride

KW - Zinc telluride

KW - photoluminescence

KW - Hot exciton relaxation

KW - Photoluminescence

KW - RAMAN-SCATTERING

KW - RESONANCE

KW - OPTICAL-PROPERTIES

KW - BINDING-ENERGIES

KW - DOTS

KW - BEHAVIORS

UR - http://www.scopus.com/inward/record.url?scp=85096201180&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/009d5fa2-b458-3546-9987-c56e21614867/

U2 - 10.1016/j.jlumin.2020.117762

DO - 10.1016/j.jlumin.2020.117762

M3 - Article

VL - 230

JO - Journal of Luminescence

JF - Journal of Luminescence

SN - 0022-2313

M1 - 117762

ER -

ID: 70928264