May 7, 2024
8:30am - 8:45am
EL06-virtual
Erwin Fernandez1,2,Daniel Grave3,Fatwa Abdi4,Roel Van de Krol1,2
Helmholtz-Zentrum Berlin1,Technische Universität Berlin2,Ben-Gurion University of the Negev3,City University of Hong Kong4
Erwin Fernandez1,2,Daniel Grave3,Fatwa Abdi4,Roel Van de Krol1,2
Helmholtz-Zentrum Berlin1,Technische Universität Berlin2,Ben-Gurion University of the Negev3,City University of Hong Kong4
Epitaxial strain engineering is a powerful tool to perturb the electronic structure of metal oxide photoabsorbers and to potentially improve its performance [1]. Little is known, however, as to the effects of epitaxial strain on monoclinic bismuth vanadate (m-BiVO
4), a transition metal oxide relevant to solar-to-fuels application. In this work, we contribute to the understanding on how epitaxial strain alters the BiVO
4 monoclinic lattice and the optoelectronic and photoelectrochemical properties of m-BiVO
4. We also reveal how the hydrostatic and deviatoric components of the strain tensor correlates with these properties. Epitaxial films of m-BiVO
4 deposited directly on yttrium-stabilized zirconia (YSZ) experiences volume-preserving deviatoric strains that modulate its Tauc bandgaps and polaronic photoluminescence emission [2]. Hydrostatic strains, on the other hand, seem to be more important for epitaxial BiVO
4 films deposited on more device-relevant indium tin oxide (ITO)/YSZ. For these fully epitaxial BiVO
4/ITO/YSZ films, compressive hydrostatic strains narrow the Tauc bandgaps and enhances the internal quantum efficiencies [3]. Epitaxial strain can thus be exploited to modulate the optoelectronic and PEC properties of BiVO
4.
[1] B. Yildiz, “Stretching” the energy landscape of oxides—Effects on electrocatalysis and diffusion, MRS Bulletin, 39 (2014) 147.
[2] E.N. Fernandez, D.A. Grave, R. van de Krol, F.F. Abdi, Strain-Induced Distortions Modulate the Optoelectronic Properties of Epitaxial BiVO
4 Films, Advanced Energy Materials, 13 (2023) 2301075.
[3] E.N. Fernandez, D.A. Grave, F.F. Abdi, R. van de Krol,
in preparation.