Abstract
Single-phase epitaxial films of the monoclinic polymorph of BiVO4 were synthesized by reactive molecular-beam epitaxy under adsorption-controlled conditions. The BiVO4 films were grown on (001) yttria-stabilized cubic zirconia (YSZ) substrates. Four-circle x-ray diffraction, scanning transmission electron microscopy (STEM), and Raman spectroscopy confirm the epitaxial growth of monoclinic BiVO4 with an atomically abrupt interface and orientation relationship (001)BiVO4 ∥ (001)YSZ with [100]BiVO4 ∥ [100]YSZ. Spectroscopic ellipsometry, STEM electron energy loss spectroscopy (STEM-EELS), and x-ray absorption spectroscopy indicate that the films have a direct band gap of 2.5 ± 0.1 eV.
Highlights
This document was originally published by AIP Publishing, LLC. in APL Materials
It is the monoclinic polymorph of BiVO4 with the YNbO4 structure, that has been found to have the best photocatalytic properties in powder form, exhibiting high activity for oxygen evolution under visible light irradiation.[4,5,7,13]
This monoclinic polymorph is the stable polymorph of BiVO4 at room temperature and has a band gap of ∼2.4 eV.[4,5,6,7,8,9,10,11,12]
Summary
This document was originally published by AIP Publishing, LLC. in APL Materials. This work is provided under a Creative Commons Attribution License. In this Letter, we report the growth of epitaxial films of the monoclinic polymorph of BiVO4.
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