研究目的
To resolve the mismatch between charge separation and light harvesting in BiVO4 films for solar-assisted water splitting by developing space-efficient SnO2 underlayers using atomic layer deposition.
研究成果
The use of ALD for SnO2 underlayers significantly improves the space-efficiency and performance of BiVO4 photoanodes, achieving a record ABPE of 0.71% for ALD-prepared photoanodes. This demonstrates the importance of materials chemistry in optimizing underlayer thickness and performance.
研究不足
The study is limited by the bulk recombination rate of SF-ALD BiVO4, which may require further optimization of bulk defect chemistry for improved performance.
1：Experimental Design and Method Selection:
The study utilized atomic layer deposition (ALD) for the synthesis of conformal and low defect density SnO2 underlayers. The efficacy of these underlayers was tested in BiVO4 photoanodes for photoelectrochemical (PEC) water splitting.
2：Sample Selection and Data Sources:
Samples were prepared with varying thicknesses of SnO2 underlayers (2-32 nm) on fluorine-doped tin oxide (FTO) substrates. BiVO4 was deposited using surface functionalized ALD (SF-ALD).
3：List of Experimental Equipment and Materials:
ALD reactor (Arradiance Gemstar-8), ozone generator (Absolute Ozone), SEM (Zeiss Ultra Plus), UV-vis spectrophotometer (Shimadzu UV-2450), and potentiostat (BioLogic SP-150).
4：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: SnO2 underlayers were deposited using TDMASn and ozone. BiVO4 was deposited using BiPh3 and VTIP precursors. Samples were calcined and characterized for PEC performance.
5：Data Analysis Methods:
Photocurrent, charge separation efficiency (φsep), and applied bias photon-to-charge efficiency (ABPE) were measured and analyzed.
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