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

I. Kh Akopyan, M.É. Labzovskaya, B. V. Novikov, V. G. Talalaev, J. W. Tomm, J. Schilling

Research output

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.

Original languageEnglish
Pages (from-to)402-407
Number of pages6
JournalPhysics of the Solid State
Volume61
Issue number3
DOIs
Publication statusPublished - 1 Mar 2019

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Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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