Journal
APPLIED SURFACE SCIENCE
Volume 476, Issue -, Pages 733-740Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.01.177
Keywords
Ga2O3; ZnO; ZGO; Atomic layer deposition
Categories
Funding
- National Natural Science Foundation of China [U1632121, 11804055, 51861135105, 61874034]
- National Key R&D Program of China [2016YFE0110700]
- Natural Science Foundation of Shanghai [18ZR1405000]
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Diethylzinc and H2O were used as the precursors for the thermal atomic layer deposition (TH-ALD) of ZnO deposition while the trimethylgallium and O-2 plasma were used as a reactant for the plasma-enhanced atomic layer deposition (PE-ALD) of Ga2O3, respectively. The Zn-doped Ga2O3 (ZGO) films were fabricated by a combination of PE-ALD of Ga2O3 and TH-ALD of ZnO at a low temperature of 200 degrees C. The results show that asdeposited ZGO films were amorphous while ZnO with a crystalline structure. XPS results indicate that the Zn content in ZGO films increased from 9.70 to 24.65 at.% with the cycle ration of Ga2O3 with respect to ZnO decreasing from 7:1 to 3:1 while the oxygen vacancy increased from 27.65% to 37.93%. The rise in Zn doping contents is also accompanied by significant variations in the morphological, electrical, and optical properties of the ZGO films, including a decrease of film density and resistivity, an increase of RMS roughness, a strong transmittance in the ultraviolet-visible (UV-vis) area, and a widening of the band gap from 4.64 to 5.25 eV. These findings help deposit ZGO films with desired structure and properties for electronic device applications.
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