Enhanced native acceptor-related blue emission of ZnO thin films annealed in an oxygen ambient

Eunhee Shim, Choeun Lee, Eiwhan Jung, Jinyong Lee, Doo Soo Kim, Youngmin Lee, Deuk Young Kim, Sejoon Lee

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The thermodynamic behaviors of charged point defects in unintentionally-doped ZnO thin films were investigated. The as-grown sample displayed two different types of blue-emission bands: one at ~2. 95 eV from native-donor zinc interstitial (Zn i) and the other at ~3.17 eV from native-acceptor zinc vacancies (V Zn). In the samples annealed at oxygen ambience, V Zn-related emission was dramatically enhanced, and Zn i-related emission was drastically reduced. The behavior was observed to become more apparent when the annealing temperature was increased. The results can be explained by both the increased generation probability and the lowered formation enthalpy of V Zn in an oxygen-rich environment, particularly at higher temperatures.

Original languageEnglish
Pages (from-to)1939-1943
Number of pages5
JournalJournal of the Korean Physical Society
Volume60
Issue number11
DOIs
StatePublished - Jun 2012

Keywords

  • Annealing
  • Blue emission
  • Native point-defect
  • Photoluminescence
  • Thermodynamic behavior
  • Zn vacancy
  • ZnO

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