Enhanced room temperature ferromagnetism and photoluminescence behavior of Cu-doped ZnO co-doped with Mn

Ashokkumar, Muthupandian; Muthukumaran, Shobha

doi:10.1016/j.physe.2015.02.010

Cited by 33 publications

(17 citation statements)

References 39 publications

(37 reference statements)

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“…[22][23][24][25][26] These Bragg's reflections were perfectly indexed using standard diffraction patterns card (ICSD Collection Code: 031060, PDF 36-1451). 27,28 The absence of any impurity phase directly corresponds to single phase nature of ZnO film within the measured angle range (20 • -80 • ). Reduction in (002) peak intensity and recurrence of (103) peak is an open evidence of N incorporated in ZnO hexagonal wurtzite structure at O 2 lattice site.…”

Section: Resultsmentioning

confidence: 61%

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Acceptor-modulated optical enhancements and band-gap narrowing in ZnO thin films

et al. 2018

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Fermi-Dirac distribution for doped semiconductors and Burstein-Moss effect have been correlated first time to figure out the conductivity type of ZnO. Hall Effect in the Van der Pauw configuration has been applied to reconcile our theoretical estimations which evince our assumption. Band-gap narrowing has been found in all p-type samples, whereas blue Burstein-Moss shift has been recorded in the n-type films. Atomic Force Microscopic (AFM) analysis shows that both p-type and n-type films have almost same granular-like structure with minor change in average grain size (∼ 6 nm to 10 nm) and surface roughness rms value 3 nm for thickness ∼315 nm which points that grain size and surface roughness did not play any significant role in order to modulate the conductivity type of ZnO. X-ray diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDS) and X-ray Photoelectron Spectroscopy (XPS) have been employed to perform the structural, chemical and elemental analysis. Hexagonal wurtzite structure has been observed in all samples. The introduction of nitrogen reduces the crystallinity of host lattice. 97% transmittance in the visible range with 1.4 × 107 Ω-1cm-1 optical conductivity have been detected. High absorption value in the ultra-violet (UV) region reveals that NZOs thin films can be used to fabricate next-generation high-performance UV detectors.

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Section: Resultsmentioning

confidence: 61%

“…At high N -doping, crystalline phase tends to shift towards amorphous behavior which emphasizes that high level of N -doping provides more lattice mismatches which disturb the original crystalline behavior of ZnO films. 28 Fig . 1b shows the variation of crystallite size and dislocation density with N 2 flow rate.…”

Section: Resultsmentioning

confidence: 99%

Acceptor-modulated optical enhancements and band-gap narrowing in ZnO thin films

et al. 2018

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“…Additionally, ZnO is used as photocatalyst [5,6] and in different catalytic reaction such as steam reforming of alcohols [7,8], synthesis of methanol [9] and complete oxidation of CO [10] and trichloroethylene [11]. Also, doping ZnO with transition metal such as Mn and Cu could affect the electronic surface band structure of ZnO and change its applications [10,12,13].…”

Section: Introductionmentioning

confidence: 99%

Structural and optical properties of ZnO and manganese-doped ZnO

Gallegos

Peluso

Thomas

et al. 2016

Journal of Alloys and Compounds

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The structural, morphological and optical properties of manganese oxides supported on commercial ZnO, prepared by impregnation with manganese nitrate, were investigated. The nominal compositions of Mn in the samples were 5, 10, 15 and 20 %w/w.The Xray diffraction (XRD) experiments revealed the presence of the ZnO wurtzite phase in all the samples, and ZnMnO 3 was also found in the samples with 15 wt% and 20 wt% of Mn. X-ray photoelectron spectroscopy (XPS) showed the presence of Mn 2+ and Mn 4+ in the xMnZnO samples. The results showed that the Mn 2+ ions had

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“…The quenching of UV and visible emissions may imply that some non-radiative recombination transition occur in the thin films. Ashokkumar et al [42] reported similar reduction of emission intensity in Mn co-doped Cu-ZnO nanoparticles. They thought that decrease of peak intensity would be attributed to the increase of non-radiative recombination process.…”

Section: Resultsmentioning

confidence: 78%

Microstructure, surface morphology and optical properties of Na x Cu y Zn1−x−y O thin films

Zhao

et al. 2015

J Mater Sci: Mater Electron

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Na x Cu y Zn 1-x-y O thin films were prepared by sol-gel method on quartz glass. The effect of Na (or Cu) doping on the microstructure, surface morphology, optical properties of the thin films was investigated. The Na 0.1 Cu 0.01 Zn 0.89 O thin film has the largest average grain size and the best preferential c-axis orientation, which may be attributed to the difference in ionic radius between Zn and Na (or Cu). The Na 0.1 Cu 0.01 Zn 0.89 O thin film also presents denser morphology with little voids and the smallest optical band gap, which may be attributed to band edge bending and the larger grain size. The largest intensity of A 1 (LO) modes may be due to the major structural defect concentrations. The quenching of UV and visible emissions, which may be attributed to the increase of non-radiative recombination transition, has been observed in the Na 0.1 Cu 0.01 Zn 0.89 O and Na 0.1-Cu 0.02 Zn 0.88 O thin films.

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Enhanced room temperature ferromagnetism and photoluminescence behavior of Cu-doped ZnO co-doped with Mn

Cited by 33 publications

References 39 publications

Acceptor-modulated optical enhancements and band-gap narrowing in ZnO thin films

Acceptor-modulated optical enhancements and band-gap narrowing in ZnO thin films

Structural and optical properties of ZnO and manganese-doped ZnO

Microstructure, surface morphology and optical properties of Na x Cu y Zn1−x−y O thin films

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