Optical properties of Cu implanted ZnO

Çetin, A. Enis; Kibar, R.; Ayvacıklı, M.; Can, N.; Buchal, Ch.; Townsend, P. D.; Степанов, А. Л.; Karalı, T.; Selvī, S.

doi:10.1016/j.nimb.2006.03.189

Cited by 40 publications

(19 citation statements)

References 12 publications

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“…Earlier ZnO data had revealed that both Cu and Tb implants displaced the TL emission patterns from that of the unimplanted material. [12][13][14] This type of change was observed again in the current study, as shown by Fig. 5.…”

Section: A Structural Relaxations Of Substratessupporting

confidence: 83%

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Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Wang

Zhang

et al. 2015

Journal of Applied Physics

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Low temperature radioluminescence and thermoluminescence spectra of ZnO track numerous changes produced by copper ion implantation into the surface layer. A significant, but unexpected, feature is that the bulk crystal becomes modified by the stress generated in the surface layer. This is reflected by the energy of intrinsic band gap emission. There are also differences in the spectra and peak temperatures of the thermoluminescence components, consistent with such a structural relaxation. The copper implant layer is both absorbing and reflective, so this introduces major distortions on the radioluminescence component from the bulk region, since the bulk luminescence signals are transmitted through, or reflected from, the implant layer. The temperature dependence of the spectra includes anomalies that are typical of changes driven by phase transitions of nanoparticle inclusions. Overall, the features of bulk relaxation, spectral distortion, and detection of nanoparticle inclusions are rarely considered for ion implanted luminescence studies, but the data suggest they are almost inevitable in a wide range of implanted materials.

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Section: A Structural Relaxations Of Substratessupporting

confidence: 83%

“…[12][13][14] There is, therefore, the potential that similar bulk changes from surface implants may be a more general feature, but they have rarely been discussed or sought, but clearly should be.…”

Section: Introductionmentioning

confidence: 99%

Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Wang

Zhang

et al. 2015

Journal of Applied Physics

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“…[7][8][9] In a recent work, Zunger et al 10 questioned the reliability of the reported theoretical predictions pointing at the severe limitations of pure density functional theory approximations [local density approximation (LDA) and generalized gradient approximation (GGA)] in correctly and accurately describing band gap values and spin localization, both essential components when investigating TM doped semiconductors. The critical problem of state of the art methods in describing such complex systems as Cu-doped ZnO can largely benefit from a detailed comparison of a number of computed properties with available experimental data (in particular, defect or impurity levels position in the band gap from optical or photoluminescence spectroscopies 11,12 and their electron paramagnetic resonance parameters 13,14 ). In this paper we present a detailed study of copper bulk impurities in ZnO using the popular hybrid B3LYP a) Electronic mail: cristiana.divalentin@mater.unimib.it.…”

Section: Introductionmentioning

confidence: 99%

Copper impurities in bulk ZnO: A hybrid density functional study

Gallino

Valentin²

2011

The Journal of Chemical Physics

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Transition metal doping of ZnO is considered as a promising way to obtain a diluted magnetic semiconducting oxide. In this work we investigate copper doping of ZnO by means of density functional theory, using a hybrid exchange-correlation functional and a periodic approach with localized atomic basis functions. Isolated copper species, such as copper substitutional to zinc, Cu s , and Cu interstitial, Cu i , are analyzed in terms of transition energy levels and hyperfine coupling constants with reference to available spectroscopic data. We also examine the potential magnetic interaction between copper species, their interaction with oxygen vacancies, and the possibility of copper clustering. The relative stability of the various copper impurities considered in this study is finally compared on the basis of their formation energy at different oxygen chemical potentials and Fermi level values.

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“…2(b) presents the result of Á 2 as a function of temperature calculated by a nonlinear least square fit, yielding an ionization energy of 88 meV. This rather small value corresponds to the formation of shallow donor states created by the incorporation of Cu atoms in bulk ZnO, which is not simple to rationalize since all Cu related species in ZnO have been reported in the literature as deep acceptors with ionization energies larger than 2 eV [14][15][16][17]. Note that a deep acceptor state would not lead to an apparent quasielastic peak broadening in HREELS.…”

mentioning

confidence: 99%

“…Several studies based on photoluminescence experiments [14,15], electrical measurements [16,17], and on GGA þ U calculations [18] have reported a deep acceptor state with the transition energy level (0, À1) high in the band gap. In this Letter we present a combined experimental and theoretical study of the Cu=ZnO system prepared by Cu deposition on ZnO single crystal surfaces.…”

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confidence: 99%

Shallow Donor States Induced by In-Diffused Cu in ZnO: A Combined HREELS and Hybrid DFT Study

et al. 2011

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A combined experimental and first principles study of Cu defects in bulk ZnO is presented. Cu particles are epitaxially deposited on the polar O-ZnOð000 " 1Þ surface at room temperature. Upon heating, a broadening of the quasielastic peak in high resolution electron energy loss spectra is observed, corresponding to an electronic doping effect of Cu atoms in bulk ZnO with an ionization energy of 88 meV. Cu impurities in ZnO, although commonly acting as acceptors, are presently observed to induce shallow donor states. We assign these to interstitial Cu species on the basis of a hybrid density functional study.

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Optical properties of Cu implanted ZnO

Cited by 40 publications

References 12 publications

Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Substrate lattice relaxations, spectral distortions, and nanoparticle inclusions of ion implanted zinc oxide

Copper impurities in bulk ZnO: A hybrid density functional study

Shallow Donor States Induced by In-Diffused Cu in ZnO: A Combined HREELS and Hybrid DFT Study

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