Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods

Three samples of epitaxial delafossite CuFeO2 and CuFe1-xGaxO2 films were grown using Pulsed Laser Deposition techniques in high vacuum. The sample thicknesses were estimated to be 21 nm, 75 nm for the CuFeO2 films and similar to 37 nm for the composite sample containing gallium. The estimated galli...

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Autores: Wheatley, RA, Rojas-de la Fuente, Susana, Oppolzer, C, Joshi, T, Borisov, P, Lederman, D, Cabrera-Oyarzún, Alejandro Leopoldo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:Chile
Idioma:inglés
OAI Identifier:oai:repositorio.anid.cl:10533/219415
Acceso en línea:https://hdl.handle.net/10533/219415
Access Level:acceso abierto
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dc.title.es_CL.fl_str_mv Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods
dc.title.journal.es_CL.fl_str_mv Thin Solid Films
title Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods
spellingShingle Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods
Wheatley, RA
title_short Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods
title_full Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods
title_fullStr Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods
title_full_unstemmed Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods
title_sort Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methods
dc.creator.none.fl_str_mv Wheatley, RA
Rojas-de la Fuente, Susana
Oppolzer, C
Joshi, T
Borisov, P
Lederman, D
Cabrera-Oyarzún, Alejandro Leopoldo
author Wheatley, RA
author_facet Wheatley, RA
Rojas-de la Fuente, Susana
Oppolzer, C
Joshi, T
Borisov, P
Lederman, D
Cabrera-Oyarzún, Alejandro Leopoldo
author_role author
author2 Rojas-de la Fuente, Susana
Oppolzer, C
Joshi, T
Borisov, P
Lederman, D
Cabrera-Oyarzún, Alejandro Leopoldo
author2_role author
author
author
author
author
author
description Three samples of epitaxial delafossite CuFeO2 and CuFe1-xGaxO2 films were grown using Pulsed Laser Deposition techniques in high vacuum. The sample thicknesses were estimated to be 21 nm, 75 nm for the CuFeO2 films and similar to 37 nm for the composite sample containing gallium. The estimated gallium fraction of substituted ferric atoms was x = 0.25 for the composite sample. We present the study of the fundamental band gap(s) for each sample via observation of their respective optical absorption properties in the NIR-VIS region using transmittance and diffuse reflection spectroscopy. Predominant absorption edges measured at 1.1 eV and 2.1 eV from transmittance spectra were observed for the CuFeO2 samples. The sample of CuFe1-xGaxO2 showed a measurable shift to 1.5 eV of the lower band-gap and a strong absorption edge located at 23 eV attributed to direct band to band transitions. This study also found evidence of changes between apparent absorption edges between transmittance and diffuse reflectance spectroscopies of each sample and it may be resultant from absorption channels via surface states. (C) 2017 Published by Elsevier B.V. Keywords. Author Keywords:Cu oxide; Delafossite crystal structure; Optical transmission; Diffused reflectance; Band gap; p-Type semiconductor; Photo-conductor
publishDate 2017
dc.date.issued.es_CL.fl_str_mv 2017
dc.date.accessioned.none.fl_str_mv 2018-08-17T13:43:36Z
2022-07-07T15:09:10Z
dc.date.available.none.fl_str_mv 2018-08-17T13:43:36Z
2022-07-07T15:09:10Z
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dc.language.iso.none.fl_str_mv eng
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dc.relation.doi.es_CL.fl_str_mv 10.1016/j.tsf.2017.02.005
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spelling Cabrera-Oyarzún, Alejandro LeopoldoLederman, DBorisov, PJoshi, TOppolzer, CRojas-de la Fuente, SusanaWheatley, RA201710.1016/j.tsf.2017.02.005https://hdl.handle.net/10533/219415http://purl.org/coar/access_right/c_abf2Comparative study of the structural and optical properties of epitaxial CuFeO2 and CuFe(1-x)GaxO(2) delafossite thin films grown by pulsed laser deposition methodsWheatley, RARojas-de la Fuente, SusanaOppolzer, CJoshi, TBorisov, PLederman, DCabrera-Oyarzún, Alejandro Leopoldo2018-08-17T13:43:36Z2022-07-07T15:09:10Z2018-08-17T13:43:36Z2022-07-07T15:09:10Z2017Three samples of epitaxial delafossite CuFeO2 and CuFe1-xGaxO2 films were grown using Pulsed Laser Deposition techniques in high vacuum. The sample thicknesses were estimated to be 21 nm, 75 nm for the CuFeO2 films and similar to 37 nm for the composite sample containing gallium. The estimated gallium fraction of substituted ferric atoms was x = 0.25 for the composite sample. We present the study of the fundamental band gap(s) for each sample via observation of their respective optical absorption properties in the NIR-VIS region using transmittance and diffuse reflection spectroscopy. Predominant absorption edges measured at 1.1 eV and 2.1 eV from transmittance spectra were observed for the CuFeO2 samples. The sample of CuFe1-xGaxO2 showed a measurable shift to 1.5 eV of the lower band-gap and a strong absorption edge located at 23 eV attributed to direct band to band transitions. This study also found evidence of changes between apparent absorption edges between transmittance and diffuse reflectance spectroscopies of each sample and it may be resultant from absorption channels via surface states. (C) 2017 Published by Elsevier B.V. Keywords. 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