研究目的
To determine the band alignment of BiOCl and ZnO heterostructure to improve optoelectronic properties of bismuth oxyhalides.
研究成果
The band alignment of BiOCl/ZnO heterostructure was determined to be type-II, with a valence band offset (VBO) of 0.294 § 0.10 eV and a conduction band offset (CBO) of 0.324 § 0.10 eV. This provides a route to explain and understand some physical phenomena on BiOCl/ZnO heterostructure and is meaningful for optimization of BiOX heterojunctions applications.
研究不足
The study focuses on the band alignment of BiOCl/ZnO heterostructure and does not explore other potential applications or modifications of the materials.
1：Experimental Design and Method Selection:
BiOCl/ZnO core shell nanosheets with different thickness of shell layer were synthesized by atomic layer deposition (ALD). X-ray photoelectron spectroscopy (XPS) was used to measure the valence band offset (VBO).
2：Sample Selection and Data Sources:
Three samples were prepared: BiOCl nanosheets, and 5nm and 150nm thick ZnO shell layer deposited on the surface of BiOCl nanosheets.
3：List of Experimental Equipment and Materials:
LabNano TM 9100 Atomic Layer Deposition (ALD) system, PHI Quantera SXM instrument with Al Ka as the x-ray radiation source.
4：Experimental Procedures and Operational Workflow:
BiOCl nanosheets were synthesized by a vapor diffusion strategy at room temperature. ZnO shell layer was deposited using H2O and Diethyl zinc (DEZn) as precursors. XPS measurements were performed with charge neutralization.
5：Data Analysis Methods:
The valence band offset (VBO) was calculated using XPS results, and the conduction band offset (CBO) was estimated by considering the band gaps of ZnO and BiOCl.
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