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Physics of the Solid State

, Volume 61, Issue 3, pp 402–407 | Cite as

Emission Kinetics of Surface (Bi)Excitons in ZnO Thin Films

  • I. Kh. Akopyan
  • M. E. LabzovskayaEmail author
  • B. V. Novikov
  • V. G. Talalaev
  • J. W. Tomm
  • J. Schilling
OPTICAL PROPERTIES

Abstract

The kinetics of near-edge photoluminescence (PL) in ZnO nanofilms prepared by the atomic layer deposition has been investigated. It is established that the kinetics of near-edge PL in 4-nm films is determined to a great extent by surface 2D-exciton (SX) and biexciton (SXX) complexes. The contribution from surface biexcitons is estimated based on a photostimulated change in the surface potential in ZnO films with different thicknesses. Ultrafast dynamics of surface biexcitons in thin films are revealed. It is shown that biexcitons localized near the surface have the shortest radiative lifetime (less than 100 ps) among all bound exciton complexes, which is explained by the large oscillator strength.

Notes

ACKNOWLEDGMENTS

I.Kh. Akopyan, M.E. Labzovskaya, and B.V. No-vikov acknowledge the support of the Russian Foundation for Basic Research, project no. 18-03-00754.

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  • I. Kh. Akopyan
    • 1
  • M. E. Labzovskaya
    • 1
    Email author
  • B. V. Novikov
    • 1
  • V. G. Talalaev
    • 2
  • J. W. Tomm
    • 3
  • J. Schilling
    • 2
  1. 1.St. Petersburg State UniversitySt. PetersburgRussia
  2. 2.Martin-Luther University, Centre for Innovation Competence SiLi-nanoHalleGermany
  3. 3.Max Born Institute for Nonlinear Optics and Short Pulse SpectroscopyBerlinGermany

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