Reversible tuning of ZnO optical band gap by plasma treatment

Szetsen Lee, Jr Wei Peng, Ching Yuan Ho

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Zinc oxide (ZnO) films synthesized by reacting zinc nitrate with hexamethylenetetramine were treated with hydrogen and oxygen plasmas. From UV-visible absorption and optical emission inspection,wehave found that the optical band gap ofZnOfilms blue-shifted with hydrogen plasma treatment, but red-shifted with oxygen plasma treatment. By alternating the treatment sequence of hydrogen and oxygen plasmas, the ZnO optical band gap can be reversibly fine-tuned with the tunable range up to 80 meV. Scanning electron microscopy characterization indicates that the variation of the optical band gap is attributed to the competition between amorphous and crystalline forms of ZnO. The mechanism of reversible optical band gap tuning is discussed.

Original languageEnglish
Pages (from-to)211-215
Number of pages5
JournalMaterials Chemistry and Physics
Issue number1-2
Publication statusPublished - 2011 Dec 15

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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