期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 290, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2020.121576
关键词
Gallium oxide; Bandgap; Tauc plot; Extrapolation; UV-vis-NIR
资金
- Universiti Sains Malaysia (USM) [1001/PFIZIK/8011005]
The effect of the Tauc plot scale and bandgap extrapolation technique on estimated optical bandgap values is often not strongly emphasized. Herein, we demonstrate that the scale of the conventional Tauc plot and the extrapolation technique poses significant influence on the determined value of bandgap. The nanomaterial used for this study was prepared by the CVD method using different H-2 reducing gas flow rates. XRD measurements confirmed polycrystalline beta-Ga2O3 with high crystalline quality. FE-SEM analysis revealed nanohump-like morphology. UV-vis-NIR measurements generally showed increasing bandgap with rising H-2 supply into the horizontal reactor. Specifically, it was observed that the proper extrapolation technique for bandgap estimation is more appropriate as compared to the values obtained from the traditional direct extrapolation method. It is established that direct extrapolation technique has the potential to either under - or over-estimate bandgap values, whereas the proper extrapolation method is promising for more reasonable values of optical energy gap.
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