Ultrafast carrier dynamics and optical pumping of lasing from Ar-plasma treated ZnO nanoribbons

Ketaki Sarkar*, Souvik Mukherjee, Gary Wiederrecht, Richard D. Schaller, David J. Gosztola, Michael A. Stroscio, Mitra Dutta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


It is a well-known fact that ZnO has been one of the most studied wide bandgap II-VI materials by the scientific community specifically due to its potential for being used as exciton-related optical devices. Hence, realizing ways to increase the efficiency of these devices is important. We discuss a plasma treatment technique to enhance the near-band-edge (NBE) excitonic emission from ZnO based nanoribbons. We observed an enhancement of the NBE peak and simultaneous quenching of the visible emission peak resulting from the removal of surface traps on these ZnO nanoribbons. More importantly, we report here the associated ultrafast carrier dynamics resulting from this surface treatment. Femtosecond transient absorption spectroscopy was performed using pump-probe differential transmission measurements shedding new light on these improved dynamics with faster relaxation times. The knowledge obtained is important for improving the application of ZnO based optoelectronic devices. We also observed how these improved carrier dynamics have a direct effect on the threshold and efficiency of random lasing from the material.

Original languageEnglish (US)
Article number095701
Issue number9
StatePublished - Jan 24 2018


  • Zinc oxide
  • carrier dynamics
  • lasing
  • near-band-edge emission
  • plasma etching

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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