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Role of the third metal oxide in In–Ga–Zn–O4 amorphous oxide semiconductors: Alternatives to gallium

Zhaofu Zhang, Yuzheng Guo Orcid Logo, John Robertson

Journal of Applied Physics, Volume: 128, Issue: 21, Start page: 215704

Swansea University Author: Yuzheng Guo Orcid Logo

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DOI (Published version): 10.1063/5.0032897

Abstract

We study the role of the third metal oxide in In–Ga–Zn-type oxides (IGZO), Ga2O3, by comparing the calculated electronic properties of various alternatives (Al, Y, Hf, Ti, Si, and W) with Ga. It is found that Ga2O3 causes little disorder in the conduction band minimum (CBM) energy based on In or Zn...

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Published in: Journal of Applied Physics
ISSN: 0021-8979 1089-7550
Published: AIP Publishing 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa55961
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Abstract: We study the role of the third metal oxide in In–Ga–Zn-type oxides (IGZO), Ga2O3, by comparing the calculated electronic properties of various alternatives (Al, Y, Hf, Ti, Si, and W) with Ga. It is found that Ga2O3 causes little disorder in the conduction band minimum (CBM) energy based on In or Zn oxides, and it has a large O vacancy suppression effect, which benefits both a high mobility and a low OFF current of IGZO. However, other alternatives give a pronounced conduction band disorder potential due to their higher CBM energies and thus are not ideal components in amorphous oxide semiconductors. Si and W may reduce the negative bias illumination stress instability by lowering hydrogen-induced states to below the bulk valence band maximum, but Si is not beneficial for mobility. Their role in back-end-of-line transistors is also noted.
College: Faculty of Science and Engineering
Issue: 21
Start Page: 215704