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

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

doi:10.1063/1.3671414

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

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

National Renewable Energy Laboratory
University of Denver
University of Toledo

Research output: Contribution to journal › Article › peer-review

30 Scopus Citations

Abstract

We have synthesized pure and Ti-alloyed hematite thin films on F doped SnO ₂ coated glass substrates by radio frequency magnetron co-sputtering of iron oxide and titanium targets in mixed Ar/O ₂ and mixed N ₂/O ₂ ambient. We found that the hematite films deposited in the N ₂/O ₂ ambient exhibit much poorer crystallinity than the films deposited in the Ar/O 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.

Original language	American English
Article number	123511
Number of pages	7
Journal	Journal of Applied Physics
Volume	110
Issue number	12
DOIs	https://doi.org/10.1063/1.3671414 https://doi.org/10.1063/1.3671414
State	Published - 15 Dec 2011

NLR Publication Number

NREL/JA-5200-54352

Keywords

photoelectrochemical (PEC) water splitting
solar-to-chemical energy sonversion

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title = "Synthesis and Characterization of Titanium-Alloyed Hematite Thin Films for Photoelectrochemical Water Splitting",

abstract = "We have synthesized pure and Ti-alloyed hematite thin films on F doped SnO 2 coated glass substrates by radio frequency magnetron co-sputtering of iron oxide and titanium targets in mixed Ar/O 2 and mixed N 2/O 2 ambient. We found that the hematite films deposited in the N 2/O 2 ambient exhibit much poorer crystallinity than the films deposited in the Ar/O 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.",

keywords = "photoelectrochemical (PEC) water splitting, solar-to-chemical energy sonversion",

author = "Houwen Tang and Matin, \{M. A.\} and Heli Wang and Todd Deutsch and Mowafak Al-Jassim and John Turner and Yanfa Yan",

year = "2011",

month = dec,

day = "15",

doi = "10.1063/1.3671414",

language = "American English",

volume = "110",

journal = "Journal of Applied Physics",

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TY - JOUR

T1 - Synthesis and Characterization of Titanium-Alloyed Hematite Thin Films for Photoelectrochemical Water Splitting

AU - Tang, Houwen

AU - Matin, M. A.

AU - Wang, Heli

AU - Deutsch, Todd

AU - Al-Jassim, Mowafak

AU - Turner, John

AU - Yan, Yanfa

PY - 2011/12/15

Y1 - 2011/12/15

N2 - We have synthesized pure and Ti-alloyed hematite thin films on F doped SnO 2 coated glass substrates by radio frequency magnetron co-sputtering of iron oxide and titanium targets in mixed Ar/O 2 and mixed N 2/O 2 ambient. We found that the hematite films deposited in the N 2/O 2 ambient exhibit much poorer crystallinity than the films deposited in the Ar/O 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.

AB - We have synthesized pure and Ti-alloyed hematite thin films on F doped SnO 2 coated glass substrates by radio frequency magnetron co-sputtering of iron oxide and titanium targets in mixed Ar/O 2 and mixed N 2/O 2 ambient. We found that the hematite films deposited in the N 2/O 2 ambient exhibit much poorer crystallinity than the films deposited in the Ar/O 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.

KW - photoelectrochemical (PEC) water splitting

KW - solar-to-chemical energy sonversion

UR - https://www.scopus.com/pages/publications/84855318199

U2 - 10.1063/1.3671414

DO - 10.1063/1.3671414

M3 - Article

AN - SCOPUS:84855318199

SN - 0021-8979

VL - 110

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 12

M1 - 123511

ER -

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

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