Influence of doping concentrations on the aluminum doped zinc oxide thin films properties for ultraviolet photoconductive sensor applications

Mamat, M. H.; Sahdan, Mohd Zainizan; Khusaimi, Z.; Ahmed, Azni Zain; Abdullah, Saifollah; Rusop, M.

doi:10.1016/j.optmat.2009.12.005

Cited by 162 publications

(86 citation statements)

References 21 publications

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“…7b the amplitude of the photocurrent increases steadily from undoped ZnO to the AZO film with 2 at.% Al, going from 21 A to 58 A at 1.0 V in agreement with previous reports [36,42] . AZO films have excess carrier concentration due to ionization of donor in the thin film, which enhanced the n-type conductivity of the thin films.…”

Section: Figsupporting

confidence: 92%

Studies on the structural, morphological, optical and electrical properties of Al-doped ZnO nanorods prepared by electrochemical deposition

Henni

Merrouche

Telli

et al. 2016

Journal of Electroanalytical Chemistry

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Section: Figsupporting

confidence: 92%

Studies on the structural, morphological, optical and electrical properties of Al-doped ZnO nanorods prepared by electrochemical deposition

Henni

Merrouche

Telli

et al. 2016

Journal of Electroanalytical Chemistry

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“…12,89,90 To test this hypothesis we have performed a (semi)-quantitative analysis by 27 Al MAS NMR. With an increasing doping percentage of aluminium (1.0, 1.8 and 4.9 mol%), there are no significant changes in the crystalline component Al (IV) A of AZO nanoparticles.…”

Section: H Andmentioning

confidence: 99%

Structural investigation of aluminium doped ZnO nanoparticles by solid-state NMR spectroscopy

Avadhut

Weber

Hammarberg

et al. 2012

Phys. Chem. Chem. Phys.

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The electrical conductivity of aluminium doped zinc oxide (AZO, ZnO:Al) materials depends on doping induced defects and grain structure. This study aims at relating macroscopic electrical conductivity of AZO nanoparticles with their atomic structure, which is non-trivial because the derived materials are heavily disordered and heterogeneous in nature. For this purpose we synthesized AZO nanoparticles with different doping levels and narrow size distribution by a microwave assisted polyol method followed by drying and a reductive treatment with forming gas. From these particles electrically conductive, optically transparent films were obtained by spin-coating. Characterization involved energy-dispersive X-ray analysis, wet chemical analysis, X-ray diffraction, electron microscopy and dynamic light scattering, which provided a basis for a detailed structural solid-state NMR study. A multinuclear ( 27 Al, 13 C, 1 H) spectroscopic investigation required a number of 1D MAS NMR and 2D MAS NMR techniques (T 1 -measurements, 27 Al-MQMAS, 27 Al-1 H 2D-PRESTO-III heteronuclear correlation spectroscopy), which were corroborated by quantum chemical calculations with an embedded cluster method (EEIM) at the DFT level. From the combined data we conclude that only a small part of the provided Al is incorporated into the ZnO structure by substitution of Zn. The related 27 Al NMR signal undergoes a Knight shift when the material is subjected to a reductive treatment with forming gas. At higher (formal) doping levels Al forms insulating (Al, H and C containing) side-phases, which cover the surface of the ZnO:Al particles and increase the sheet resistivity of spin-coated material. Moreover, calculated 27 Al quadrupole coupling constants serve as a spectroscopic fingerprint by which previously suggested point-defects can be identified and in their great majority be ruled out.

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“…These results suggest a decrease of crystallinity on substitution of Al ions at Zn 2+ site. 16,17 In addition, (006) peak of b-Al 2 O 3 was also observed above 20 mol.% Al concentration (JCPDS 10-0414). Excess Al ions formed b-Al 2 O 3 , which is regarded as a reason for the rough surface.…”

Section: Al-doped Zno Film Without Citrate Ionsmentioning

confidence: 95%

Fabrication of Al-Doped ZnO Film with High Conductivity Induced by Photocatalytic Activity

Hong

Katsumata

Matsushita

2016

Journal of Elec Materi

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We have fabricated Al-doped ZnO films by a spin-spray method, achieving high conductivity by Al-ion doping and photocatalytic activity of the ZnO. The surface morphology of the as-deposited films was varied by changing the Al concentration and addition of citrate ions. As-deposited Al-doped ZnO film without citrate ions showed rod array structure with increasing rod width as the Al concentration was increased. Meanwhile, Al-doped ZnO film deposited with addition of citrate ions changed to exhibit dense and continuous surface morphology with high transmittance of 85%. The lowest resistivity recorded for undoped and Al-doped ZnO film was 2.1 9 10 À2 X cm and 5.9 9 10 À3 X cm, after ultraviolet (UV) irradiation. The reason for the decreased resistivity is thought to be that Al-ion doping and the photocatalytic activity of ZnO contributed to improve the conductivity.

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Influence of doping concentrations on the aluminum doped zinc oxide thin films properties for ultraviolet photoconductive sensor applications

Cited by 162 publications

References 21 publications

Studies on the structural, morphological, optical and electrical properties of Al-doped ZnO nanorods prepared by electrochemical deposition

Studies on the structural, morphological, optical and electrical properties of Al-doped ZnO nanorods prepared by electrochemical deposition

Structural investigation of aluminium doped ZnO nanoparticles by solid-state NMR spectroscopy

Fabrication of Al-Doped ZnO Film with High Conductivity Induced by Photocatalytic Activity

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