Evidence for replacing zinc with cobalt and iron atoms in epitaxial ZnO:CoFe-diluted magnetic semiconductors

Liao, Yen-Fa; Hsu, Hung-Chu; Huang, Yi-Yuan; Huang, Tzu-Wen; Lin, Ming-Zhe; Lee, Chih‐Hao; Huang, Jung-Chun Andrew

doi:10.1016/j.jmmm.2006.02.246

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…3 seems to provide the evidence supporting the spin-split impurity band model predicted by Coey et al [7]. For instance, by comparing the XAS of Co-doped ZnO thin film and particle samples, the same feature near 535 eV may be attributed mainly to the cobalt atoms to replace the interstitial sites [6] of the ZnO matrix surrounding the oxygen vacancies, in which the Co 2+ ion coordinated with the oxygen site tetrahedrally in the ZnO matrix [8].…”

Section: Methodssupporting

confidence: 54%

“…This limitation motivates us to synthesize a Co-doped ZnO sample using an equilibrium process, i.e., the thermal hydrolysis process, to obtain a more homogeneous nanocrystalline sample with a relatively low cost. Room-temperature ferromagnetic ordering was observed in this work, which might attribute to the incorporation of the cobalt ions in substitution of Zn sites [5] and an existence of oxygen vacancies instead of a cobalt cluster formation [6][7][8][9].…”

Section: Introductionmentioning

confidence: 91%

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X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

Liao

Huang

Lin

et al. 2007

Journal of Magnetism and Magnetic Materials

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Section: Methodssupporting

confidence: 54%

Section: Introductionmentioning

confidence: 91%

X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

Liao

Huang

Lin

et al. 2007

Journal of Magnetism and Magnetic Materials

Self Cite

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“…The broadening of spectral features observed in higher Al co-doped zinc oxide at 538 eV (A ) and 542 eV (marked by A ) ascribed to the appearance of oxygen vacancies or morphology effect observed in FESEM micrographs. The presence of new spectral features and increment in broadening imply that Al atoms fill up interstitial sites 65 in the zinc oxide surrounding oxygen vacancies. Consequently, because of the presence of oxygen vacancy, more charge can be transferred from the doped Al ions, resulting in Al ions tetrahedrally coordinated to oxygen sites in the ZnO matrix 66 .…”

Section: Resultsmentioning

confidence: 99%

Charge transfer and X-ray absorption investigations in aluminium and copper co-doped zinc oxide nanostructure for perovskite solar cell electrodes

Kaur

Gautam

Chae

et al. 2023

Sci Rep

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This study explores influence of charge transfer and X-ray absorption characteristics in aluminum (Al) and copper (Cu) co-doped zinc oxide (ZnO) nanostructures for perovskite solar cell electrodes. Sol-gel technique was employed to synthesize the nanostructures, and their optical and morphological properties were investigated. X-ray diffraction (XRD) analysis confirmed high crystallinity and also single-phase composition of all the samples, particularly up to 5% Al co-doping. Field emission scanning electron microscopy (FESEM) exhibited the formation of pseudo-hexagonal wurtzite nanostructure and the transition to nanorods at 5% Al co-doping. Diffuse reflectance spectroscopy indicated a reduction in the optical band gap of co-doped zinc oxide from 3.11 to 2.9 eV with increasing Al doping. Photoluminescence spectra (PL) exhibited a decrease in peak intensity, suggesting enhanced conductivity in ZnO, also confirmed from I-V measurements. Near-edge X-ray absorption fine structure (NEXAFS) analysis depicts that charge transfer from Al to oxygen (O) species enhanced the photosensing properties of the nanostructure, which was supported by FESEM micrographs and PL spectra. Furthermore, the study discovered that 5% Al co-doping significantly reduced the density of emission defects (deep-level) in Cu–ZnO nanostructure. These findings highlight the potential of Cu and Al co-doped ZnO materials for perovskite solar cell electrodes, as their improved optical and morphological properties resulting from charge transfer could enhance device performance. The investigation of charge transfer and X-ray absorption characteristics provides valuable insights into the underlying mechanisms and behaviors of the co-doped ZnO nanostructures. However, further research is required to delve into the intricate hybridization resulting from charge transfer and explore the broader impact of co-doping on other properties of the nanostructures, enabling a comprehensive understanding of their potential applications in perovskite solar cells.

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“…Based on a number of experimental results, researchers found that the carrier concentration in transition‐metal‐ion doped ZnO DMSs could influence their properties. So, more groups have tried to dope other ions into the ZnO DMSs in order to change the magnetic and optical properties by introducing additional carriers 10–13. In this work, we report the room‐temperature magnetic and optical properties of Zn 0.98 Cu 0.02 O and Zn 0.95 Cu 0.02 Fe 0.03 O powders prepared by the sol–gel method.…”

Section: Introductionmentioning

confidence: 98%

Structure, magnetic, and optical properties in Zn_0.98−xCu_0.02Fe_xO diluted magnetic semiconductors

Liu¹,

Yang²,

Zhong³

et al. 2010

Physica Status Solidi (a)

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Cu-doped and Cu, Fe codoped ZnO diluted magnetic semiconductors (DMSs) powders samples were synthesized by the sol-gel method. The X-ray diffraction (XRD) results showed the Zn 0.985 Cu 0.02 O and Zn 0.95 Fe 0.03 Cu 0.02 O samples were of single phase with the ZnO-like wurtzite structure. Magnetic measurements indicated that room-temperature ferromagnetism of Zn 0.98 Cu 0.02 O was intrinsic in nature and the saturation magnetization of Zn 0.98 Cu 0.02 O DMSs increased after Fe doping. Photoluminescence (PL) measurements showed that the intensity of the ultraviolet (UV) emission band and the visible-light emission band of Zn 0.95 Cu 0.02 Fe 0.03 O samples increased and the UV emission peak exhibited blue shift compared to Zn 0.98 Cu 0.02 O samples.

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Evidence for replacing zinc with cobalt and iron atoms in epitaxial ZnO:CoFe-diluted magnetic semiconductors

Cited by 8 publications

References 8 publications

X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

Charge transfer and X-ray absorption investigations in aluminium and copper co-doped zinc oxide nanostructure for perovskite solar cell electrodes

Structure, magnetic, and optical properties in Zn_0.98−xCu_0.02Fe_xO diluted magnetic semiconductors

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Evidence for replacing zinc with cobalt and iron atoms in epitaxial ZnO:CoFe-diluted magnetic semiconductors

Cited by 8 publications

References 8 publications

X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

Charge transfer and X-ray absorption investigations in aluminium and copper co-doped zinc oxide nanostructure for perovskite solar cell electrodes

Structure, magnetic, and optical properties in Zn0.98−xCu0.02FexO diluted magnetic semiconductors

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Structure, magnetic, and optical properties in Zn_0.98−xCu_0.02Fe_xO diluted magnetic semiconductors