Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
The fabrication of porous nanocomposites is crucial to enable efficient PEC devices based upon low-mobility absorbers such as oxides. The controlled fabrication of promising multinary absorbers such as BiVO4 as layers within porous and conducting scaffolds has remained challenging. Thus far most reports of composite BiVO4 devices have suffered from non-uniform depositions. ALD is an ideal method, however prior demonstrations were limited to non-stoichiometric BiVxOy or required an etch step. We have developed a Surface Functionalized ALD route with tunable Bi:V stoichiometry that enables the first production of phase-pure scheelite by SF-ALD. Most notably, the PEC performance of SF-ALD BiVO4 exhibited a remarkable sensitivity to post-synthetic treatments where IPCE changes as large as 400% resulted from a simple PEC activation step. The results are considered in the context of other emerging post-synthetic modifications of multinary absorbers. These insights may play a continued role in optimization and stability as new multinary compounds are elaborated towards solar fuels.
1) Stefik, M. Atomic Layer Deposition of Bismuth Vanadates for Solar Energy Materials. ChemSusChem 2016, 9, 1727-1735.
2) Lamm, B.; Sarkar, A. Stefik, M. Surface Functionalized Atomic Layer Deposition of Bismuth Vanadate for Single-Phase Scheelite. Journal of Materials Chemistry A 2017, 5, 6060 – 6069.
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