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Title: Atomic layer deposition of epitaxial layers of anatase on strontium titanate single crystals: Morphological and photoelectrochemical characterization

Abstract

Atomic layer deposition was used to grow epitaxial layers of anatase (001) TiO{sub 2} on the surface of SrTiO{sub 3} (100) crystals with a 3% lattice mismatch. The epilayers grow as anatase (001) as confirmed by x-ray diffraction. Atomic force microscope images of deposited films showed epitaxial layer-by-layer growth up to about 10 nm, whereas thicker films, of up to 32 nm, revealed the formation of 2–5 nm anatase nanocrystallites oriented in the (001) direction. The anatase epilayers were used as substrates for dye sensitization. The as received strontium titanate crystal was not sensitized with a ruthenium-based dye (N3) or a thiacyanine dye (G15); however, photocurrent from excited state electron injection from these dyes was observed when adsorbed on the anatase epilayers. These results show that highly ordered anatase surfaces can be grown on an easily obtained substrate crystal.

Authors:
;
Publication Date:
OSTI Identifier:
22392108
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films
Additional Journal Information:
Journal Volume: 33; Journal Issue: 1; Other Information: (c) 2014 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0734-2101
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ATOMIC FORCE MICROSCOPY; CRYSTAL DEFECTS; DEPOSITS; DYES; ELECTRON BEAM INJECTION; EPITAXY; EXCITED STATES; FILMS; IMAGES; LAYERS; MONOCRYSTALS; RUTHENIUM; STRONTIUM TITANATES; SUBSTRATES; SURFACES; TITANIUM OXIDES; X-RAY DIFFRACTION

Citation Formats

Kraus, Theodore J., Nepomnyashchii, Alexander B., and Parkinson, B. A., E-mail: bparkin1@uwyo.edu. Atomic layer deposition of epitaxial layers of anatase on strontium titanate single crystals: Morphological and photoelectrochemical characterization. United States: N. p., 2015. Web. doi:10.1116/1.4902328.
Kraus, Theodore J., Nepomnyashchii, Alexander B., & Parkinson, B. A., E-mail: bparkin1@uwyo.edu. Atomic layer deposition of epitaxial layers of anatase on strontium titanate single crystals: Morphological and photoelectrochemical characterization. United States. https://doi.org/10.1116/1.4902328
Kraus, Theodore J., Nepomnyashchii, Alexander B., and Parkinson, B. A., E-mail: bparkin1@uwyo.edu. 2015. "Atomic layer deposition of epitaxial layers of anatase on strontium titanate single crystals: Morphological and photoelectrochemical characterization". United States. https://doi.org/10.1116/1.4902328.
@article{osti_22392108,
title = {Atomic layer deposition of epitaxial layers of anatase on strontium titanate single crystals: Morphological and photoelectrochemical characterization},
author = {Kraus, Theodore J. and Nepomnyashchii, Alexander B. and Parkinson, B. A., E-mail: bparkin1@uwyo.edu},
abstractNote = {Atomic layer deposition was used to grow epitaxial layers of anatase (001) TiO{sub 2} on the surface of SrTiO{sub 3} (100) crystals with a 3% lattice mismatch. The epilayers grow as anatase (001) as confirmed by x-ray diffraction. Atomic force microscope images of deposited films showed epitaxial layer-by-layer growth up to about 10 nm, whereas thicker films, of up to 32 nm, revealed the formation of 2–5 nm anatase nanocrystallites oriented in the (001) direction. The anatase epilayers were used as substrates for dye sensitization. The as received strontium titanate crystal was not sensitized with a ruthenium-based dye (N3) or a thiacyanine dye (G15); however, photocurrent from excited state electron injection from these dyes was observed when adsorbed on the anatase epilayers. These results show that highly ordered anatase surfaces can be grown on an easily obtained substrate crystal.},
doi = {10.1116/1.4902328},
url = {https://www.osti.gov/biblio/22392108}, journal = {Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films},
issn = {0734-2101},
number = 1,
volume = 33,
place = {United States},
year = {Thu Jan 15 00:00:00 EST 2015},
month = {Thu Jan 15 00:00:00 EST 2015}
}