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

V. Agekyan, G. Budkin, M. Chukeev, N. Filosofov, G. Karczewski, A. Serov, A. Reznitsky

Результат исследований: Научные публикации в периодических изданияхстатья

Аннотация

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.
Язык оригиналаанглийский
Номер статьи117762
Число страниц5
ЖурналJournal of Luminescence
Том230
Ранняя дата в режиме онлайн12 ноя 2020
DOI
СостояниеОпубликовано - 2021

Предметные области Scopus

  • Физика конденсатов

Ключевые слова

  • Asymmetric double quantum wells
  • Cadmium telluride
  • Zinc telluride
  • Photoluminescence
  • Hot exciton relaxation

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