Structure, microstructure and determination of optical constants from transmittance data of co-doped Zn0.90Co0.05M 0.05O (MAl, Cu, Cd, Na) films

S. Roguai; A. Djelloul; Corinne Nouveau; T. Souier; A. A. Dakhel; M. Bououdina

doi:10.1016/j.jallcom.2014.02.080

Structure, microstructure and determination of optical constants from transmittance data of co-doped Zn_0.90Co_0.05M _0.05O (MAl, Cu, Cd, Na) films

S. Roguai, A. Djelloul^*, Corinne Nouveau, T. Souier, A. A. Dakhel, M. Bououdina

^*Corresponding author for this work

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

22 Citations (Scopus)

Abstract

ZnO, Zn_0.95Co_0.05O and Zn_0.90Co _0.05M_0.05O (MAl, Cd, Na, Cu) single phase films have been successfully synthesized by ultrasonic spray pyrolysis technique. Structural analysis by X-ray diffraction show that all the films have hexagonal wurtzite structure with an average crystallite size in the range of 19-25 nm. SEM analysis revealed that Cd and Na preserve the shape of nanopetals observed with ZnO or CoZnO films, while the doping with Al or Cu promote the formation of dense films constituted of nanorods. By the application of Levenberg-Marquardt least square method, the experimental transmittance data were fitted perfectly with the transmittance data calculated via a combination of Wemple-DiDomenico model, absorption coefficient of an electronic transition and Tauc-Urbach model. The concentration of absorbing centres N_Co and oscillator strength f of d-d transition of Co²⁺ ions are calculated from Smakula's formula.

Original language	English
Pages (from-to)	150-158
Number of pages	9
Journal	Journal of Alloys and Compounds
Volume	599
DOIs	https://doi.org/10.1016/j.jallcom.2014.02.080
Publication status	Published - Jun 25 2014
Externally published	Yes

Keywords

Microstructure
Optical properties
Scanning electron microscopy SEM
Thin films
X-ray diffraction

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2014.02.080

Cite this

@article{7146e24bb9034b5cb90cd0b4f9720474,

title = "Structure, microstructure and determination of optical constants from transmittance data of co-doped Zn0.90Co0.05M 0.05O (MAl, Cu, Cd, Na) films",

abstract = "ZnO, Zn0.95Co0.05O and Zn0.90Co 0.05M0.05O (MAl, Cd, Na, Cu) single phase films have been successfully synthesized by ultrasonic spray pyrolysis technique. Structural analysis by X-ray diffraction show that all the films have hexagonal wurtzite structure with an average crystallite size in the range of 19-25 nm. SEM analysis revealed that Cd and Na preserve the shape of nanopetals observed with ZnO or CoZnO films, while the doping with Al or Cu promote the formation of dense films constituted of nanorods. By the application of Levenberg-Marquardt least square method, the experimental transmittance data were fitted perfectly with the transmittance data calculated via a combination of Wemple-DiDomenico model, absorption coefficient of an electronic transition and Tauc-Urbach model. The concentration of absorbing centres NCo and oscillator strength f of d-d transition of Co2+ ions are calculated from Smakula's formula.",

keywords = "Microstructure, Optical properties, Scanning electron microscopy SEM, Thin films, X-ray diffraction",

author = "S. Roguai and A. Djelloul and Corinne Nouveau and T. Souier and Dakhel, {A. A.} and M. Bououdina",

year = "2014",

month = jun,

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doi = "10.1016/j.jallcom.2014.02.080",

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T1 - Structure, microstructure and determination of optical constants from transmittance data of co-doped Zn0.90Co0.05M 0.05O (MAl, Cu, Cd, Na) films

AU - Roguai, S.

AU - Djelloul, A.

AU - Nouveau, Corinne

AU - Souier, T.

AU - Dakhel, A. A.

AU - Bououdina, M.

PY - 2014/6/25

Y1 - 2014/6/25

N2 - ZnO, Zn0.95Co0.05O and Zn0.90Co 0.05M0.05O (MAl, Cd, Na, Cu) single phase films have been successfully synthesized by ultrasonic spray pyrolysis technique. Structural analysis by X-ray diffraction show that all the films have hexagonal wurtzite structure with an average crystallite size in the range of 19-25 nm. SEM analysis revealed that Cd and Na preserve the shape of nanopetals observed with ZnO or CoZnO films, while the doping with Al or Cu promote the formation of dense films constituted of nanorods. By the application of Levenberg-Marquardt least square method, the experimental transmittance data were fitted perfectly with the transmittance data calculated via a combination of Wemple-DiDomenico model, absorption coefficient of an electronic transition and Tauc-Urbach model. The concentration of absorbing centres NCo and oscillator strength f of d-d transition of Co2+ ions are calculated from Smakula's formula.

AB - ZnO, Zn0.95Co0.05O and Zn0.90Co 0.05M0.05O (MAl, Cd, Na, Cu) single phase films have been successfully synthesized by ultrasonic spray pyrolysis technique. Structural analysis by X-ray diffraction show that all the films have hexagonal wurtzite structure with an average crystallite size in the range of 19-25 nm. SEM analysis revealed that Cd and Na preserve the shape of nanopetals observed with ZnO or CoZnO films, while the doping with Al or Cu promote the formation of dense films constituted of nanorods. By the application of Levenberg-Marquardt least square method, the experimental transmittance data were fitted perfectly with the transmittance data calculated via a combination of Wemple-DiDomenico model, absorption coefficient of an electronic transition and Tauc-Urbach model. The concentration of absorbing centres NCo and oscillator strength f of d-d transition of Co2+ ions are calculated from Smakula's formula.

KW - Microstructure

KW - Optical properties

KW - Scanning electron microscopy SEM

KW - Thin films

KW - X-ray diffraction

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