Universität zu Köln

Mettenboerger, A., Goenuellue, Y., Fischer, T., Heisig, T., Sasinska, A., Maccato, C., Carraro, G., Sada, C., Barreca, D., Mayrhofer, L., Moseler, M., Held, A. and Mathur, S. (2016). Interfacial insight in multi-junction metal oxide photoanodes for water splitting applications. Nano Energy, 19. S. 415 - 428. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 2211-3282

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Abstract

Photoelectrochemical (PEC) properties of nanostructured hematite (Fe2O3) thin films prepared using plasma -enhanced chemical vapor deposition (PE-CVD) were investigated against the influence of processing parameters and post -synthesis heat -treatment procedures. Annealing at high temperatures (>500 degrees C) was found to substantially affect the micro -structure (grain growth and densification) and electronic (interdiffusion at the film/substrate interface) concomitantly manifested in an enhancement in the PEC behavior. The Sn impurity level in hematite films was found to increase with the annealing temperature with highest values achieved in samples heat -treated at 750 degrees C, due to the interdiffusion and substitution of Sn(IV) species at Fe(III) sites. Sn:Fe2O3 films exhibited significantly high photocurrent density of 1.33 mA cm(-2) at the water oxidation level of 1.23 V vs. RHE. The diffusion of Sn ions into iron oxide lattice altered the electronic properties of hematite films due to electron -donor behavior of the dopants that was verified by X-ray photoelectron spectroscopy and secondary ion mass spectroscopy (SIMS) analyses. Deposition of a thin overlayer of TiO2 (10 nm) on hematite films by atomic layer deposition (ALD) was found to further improve the photocurrent density to 1.8 mA cm(-2) at 1.23 V vs. RHE. Ab-initio calculations on the effect of substitutional Sn(IV) dopants in the Fe2O3 lattice on the electronic structure and the band alignment between

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mettenboerger, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goenuellue, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heisig, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sasinska, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maccato, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Carraro, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sada, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barreca, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mayrhofer, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moseler, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Held, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-293125
DOI:	10.1016/j.nanoen.2015.09.018
Journal or Publication Title:	Nano Energy
Volume:	19
Page Range:	S. 415 - 428
Date:	2016
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	2211-3282
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DOPED HEMATITE NANOSTRUCTURES; THIN-FILMS; PHOTOELECTROCHEMICAL PERFORMANCE; CELLS; ABSORPTION; GENERATION; ULTRAFAST; DYNAMICS; GROWTH; TI Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/29312