University of Oulu

Sanchez-Perez, C., Knapp, C. E., Colman, R. H., Sotelo-Vazquez, C., Oilunkaniemi, R., Laitinen, R. S., & Carmalt, C. J. (2018). Accessing new 2D semiconductors with optical band gap: synthesis of iron-intercalated titanium diselenide thin films via LPCVD. RSC Advances, 8(40), 22552–22558. https://doi.org/10.1039/c8ra03174f

Accessing new 2D semiconductors with optical band gap: synthesis of iron-intercalated titanium diselenide thin films via LPCVD

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Author: Sanchez-Perez, Clara1,2; Knapp, Caroline E.1; Colman, Ross H.3;
Organizations: 1University College London, Department of Chemistry, 20 Gordon St, London, WC1H 0AJ, UK
2Laboratory of Inorganic Chemistry, Environmental and Chemical Engineering, University of Oulu, P. O. Box 3000, FI-90014 Oulu, Finland
3Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 3, Prague 2, Czech Republic
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2019062621985
Language: English
Published: , 2018
Publish Date: 2019-06-26
Description:

Abstract

Fe-doped TiSe2 thin-films were synthesized via low pressure chemical vapor deposition (LPCVD) of a single source precursor: [Fe(η5-C5H4Se)2Ti(η5-C5H5)2]2 (1). Samples were heated at 1000 °C for 1–18 h and cooled to room temperature following two different protocols, which promoted the formation of different phases. The resulting films were analyzed by grazing incidence X-ray diffraction (GIXRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and UV/vis spectroscopy. An investigation of the Fe doping limit from a parallel pyrolysis study of FexTiSe2 powders produced in situ during LPCVD depositions has shown an increase in the Fe–TiSe2–Fe layer width with Fe at% increase. Powders were analyzed using powder X-ray diffraction (PXRD) involving Rietveld refinement and XPS. UV/vis measurements of the semiconducting thin films show a shift in band gap with iron doping from 0.1 eV (TiSe2) to 1.46 eV (Fe0.46TiSe2).

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Volume: 8
Issue: 40
Pages: 22552 - 22558
DOI: 10.1039/c8ra03174f
OADOI: https://oadoi.org/10.1039/c8ra03174f
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Subjects:
Funding: This work was supported by the Fortum Foundation, UCL and the Ramsay Memorial Trust.
Copyright information: © The Royal Society of Chemistry 2018. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
  https://creativecommons.org/licenses/by/3.0/