Stable amorphous In2O3-based thin-film transistors by incorporating SiO2 to suppress oxygen vacancies

Nobuhiko Mitoma, Shinya Aikawa, Xu Gao, Takio Kizu, Maki Shimizu, Meng Fang Lin, Toshihide Nabatame, Kazuhito Tsukagoshi

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)

Abstract

Incorporating SiO2 into amorphous In2O 3-based thin films is found to suppress the formation of unstable oxygen vacancies. The SiO2 incorporated thin film transistors exhibited reliable device characteristics after being annealed at 250 C. Increasing the SiO2 content of the sputtering target decreased the sensitivity of the subthreshold swing and turn-on voltage of the device to the sputtering conditions used to deposit the amorphous oxide, making them more stable against electrical and thermal stresses. The increased activation energy of the charge carriers in the current off region indicated a smaller density of states at the conduction-band tail, supporting stable transistor operations.

Original languageEnglish
Article number102103
JournalApplied Physics Letters
Volume104
Issue number10
DOIs
Publication statusPublished - 2014 Mar 10
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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