研究目的
Investigating the nature of oxygen vacancy (VO), namely shallow versus deep, in the amorphous oxide semiconductor InGaZnO4 (a-IGZO).
研究成果
The majority of oxygen vacancies acts as shallow donors in a-IGZO, which may help to resolve the stability problems of AOS thin film transistors.
研究不足
The small supercell size may prohibit clear-cut distinction of the defect type due to electronic coupling between highly dispersive conduction state and localized state.
1:Experimental Design and Method Selection:
First-principles calculations using hybrid functional molecular dynamics (MD) simulations to generate oxygen-deficient amorphous models of InGaZnO4 (a-IGZO).
2:Sample Selection and Data Sources:
Eight independent models of a-IGZO4-x were generated to investigate the nature of VO.
3:List of Experimental Equipment and Materials:
Vienna Ab initio Simulation Package (VASP) version
4:1 with the projector-augmented wave (PAW) pseudopotential. Experimental Procedures and Operational Workflow:
Melt-quench MD simulations were conducted to generate amorphous structures, followed by structural relaxation.
5:Data Analysis Methods:
The nature of VO was determined by examining the band dispersion, spatial distribution of the highest occupied state, and its energy level within the band gap using the inverse participation ratio (IPR).
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