Synthesis and Characterization of Titanium-Alloyed Hematite Thin Films for Photoelectrochemical Water Splitting

Tang, Houwen; Matin, M. A.; Wang, Heli; Deutsch, Todd; Al-Jassim, Mowafak; Turner, John; Yan, Yanfa

doi:10.1063/1.3671414

Synthesis and Characterization of Titanium-Alloyed Hematite Thin Films for Photoelectrochemical Water Splitting

Journal Article · Thu Dec 15 04:00:00 EST 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3671414· OSTI ID:1046316

Tang, Houwen; Matin, M. A.; Wang, Heli; Deutsch, Todd; Al-Jassim, Mowafak; Turner, John; Yan, Yanfa

We have synthesized pure and Ti-alloyed hematite thin films on F doped SnO{sub 2} coated glass substrates by radio frequency magnetron co-sputtering of iron oxide and titanium targets in mixed Ar/O{sub 2} and mixed N{sub 2}/O{sub 2} ambient. We found that the hematite films deposited in the N{sub 2}/O{sub 2} ambient exhibit much poorer crystallinity than the films deposited in the Ar/O{sub 2} ambient. We determined that Ti alloying leads to increased electron carrier concentration and crystallinity, and reduced bandgaps. Moreover, Ti-alloyed hematite thin films exhibited improved photoelectrochemical performance as compared with the pure hematite films: The photocurrents were enhanced and the photocurrent onset shifted to less positive potentials.

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 1046316

Report Number(s):: NREL/JA-5200-54352

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 110; ISSN JAPIAU; ISSN 0021-8979

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
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Synthesis and Characterization of Titanium-Alloyed Hematite Thin Films for Photoelectrochemical Water Splitting

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