Suppression of leakage current and moisture absorption of la 2O3 films with ultraviolet ozone post treatment

Yi Zhao, Koji Kita, Kentaro Kyuno, Akira Toriumi

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


In this study, ultraviolet (UV) ozone post treatment is proposed as an effective method of suppressing gate leakage current associated with the moisture absorption of lanthanum oxide (La2O3) films. It is considered that suppression effects come from the healing of oxygen vacancies in the film by the UV ozone post treatment, since the oxygen ambient annealing also shows similar suppression effects. As compared with the oxygen ambient annealing, however, the UV ozone treatment does not enhance the interface layer thickness between the La2O3 and Si substrates, whereas the oxygen ambient annealing does. Therefore, the UV ozone post treatment is an effective method of suppressing the moisture absorption of La2O 3 films.

Original languageEnglish
Pages (from-to)4189-4192
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number7 A
Publication statusPublished - 2007 Jul 4
Externally publishedYes


  • Gate dielectric
  • Lanthanum oxide
  • Leakage current
  • Moisture absorption
  • Ultraviolet ozone treatment

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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