Size dependent carrier recombination in ZnO nanocrystals

G. Pozina, L. L. Yang, Q. X. Zhao, L. Hultman, P. G. Lagoudakis

Research output: Contribution to journalArticlepeer-review

28 Citations (SciVal)

Abstract

Experimental and theoretical studies of fluorescence decay were performed for colloidal ZnO nanocrystals. The fluorescence lifetime reduces from 22 ps to ∼6 ps with decreasing nanocrystal radius. We postulate that non-radiative surface states dominate the carrier dynamics in small ZnO nanocrystals and perform Monte Carlo simulations incorporating carrier diffusion and carrier recombination to model the experimental fluorescence decay dynamics. The percentage of excitons undergoing nonradiative decay due to surface trapping is as high as 84% for nanocrystals with 8 nm radius, which explains the ultrafast decay dynamics observed in small ZnO nanostructures even at low temperatures.

Original languageEnglish
Article number131909
JournalApplied Physics Letters
Volume97
Issue number13
DOIs
Publication statusPublished - 27 Sep 2010
Externally publishedYes

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