Realization of strong violet and blue emissions from ZnO thin films by incorporation of Cu ions

Xu, Linhua; Xian, Fenglin; Zheng, Gaige; Lai, Min

doi:10.1016/j.materresbull.2017.11.007

Cited by 31 publications

(18 citation statements)

References 31 publications

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“…Cu doping to the ZnO lattice results in the shifting of UV emission observed at 3.12 eV for undoped ZnO to the visible region. This peculiar behavior observed is due to the increase in non-radiative recombination mechanisms in the ZnO lattice [28]. The spectra also show a notable enhancement in the deep-level emission observed at the violet, blue and green emission centers.…”

Section: Pl and Raman Spectroscopy Studiesmentioning

confidence: 82%

“…It is observed from figure 7(b) that the core-level spectra of the O1S is not geometrically symmetric and the presence of multiple overlapping components can be observed from the spectra. These overlapping peaks can be identified by implementing a Gaussian peak fitting method [28]. The fitting results in two peaks for the O1S spectra centered at 528.27 and 529.54 eV.…”

Section: Xps Studiesmentioning

confidence: 99%

“…Violet-blue emission centered at 2.76 and 2.80 eV for 1% and 3% Cu:ZnO films was attributed to the presence of the ionized Zni defect site and Cu acceptor levels below the conduction band, which traps electrons and results in the transition to the valence band [33][34][35]. The appearance of blue emission at 2.64 and 2.65 eV for 3% and 5% Cu:ZnO corresponds to the transition of electrons from the Cu 2+ donor level to Cu + acceptor level [28]. The absence of blue emission in undoped ZnO confirms that Cu ions can act as a luminescent activator, which can effectively regulate the luminescence behavior of ZnO [28,39].…”

Section: Pl and Raman Spectroscopy Studiesmentioning

confidence: 99%

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X-ray photoelectron spectroscopy, Raman and photoluminescence studies on formation of defects in Cu:ZnO thin films and its role in nonlinear optical features

Antony¹,

Poornesh

Kityk

et al. 2018

Laser Phys.

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The structural, optical, morphological and nonlinear optical properties of Cu:ZnO spraycoated films are studied. The surface morphology of Cu:ZnO thin films turned out to be homogenous, crack free and well covered with pea-shaped grains. The peak shift observed in the xray photoelectron spectroscopy spectra of the Cu:ZnO thin films infers the defect states present in the films. The satellite peak observed at 939.9 eV for Cu2P core-level spectra confirms the +2 oxidation state of Cu in the films. The formation of additional defect levels in the nanostruc-tures upon Cu doping was investigated using photoluminescence (PL) and Raman spectroscopy studies. The luminescent centers in the violet, blue and green spectral region were observed. The most prominent emission was centered at the blue color center for 5% Cu:ZnO thin films. The enhancement in the PL emission intensity confirms the increase in the defect state density upon Cu doping. The shifting of the UV emission peak to the visible region validates the increase in the nonradiative recombination process in the films upon doping. The phonon modes observed in Raman analysis around 439, 333 and 558 cm −1 confirm the improvement in the crystallinity and formation of defect states in the films. X-ray diffraction reveals that the deposited films are of single-phase wurtzite ZnO structure with preferential growth orientation parallel (0 0 2) to the C-axis. The thirdorder optical susceptibility χ(3) has been increased from 3.5 × 10 −4 to 2.77 × 10 −3 esu due to the enhancement of electronic transition to different defect levels formed in the films and through local heating effects arising due to continuous wave laser illumination. The enhanced third harmonic generation signal investigated using a Nd:YAG laser at 1064 nm and 8 ns pulse width shows the credibility of Cu:ZnO films in frequency tripling applications.

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Section: Pl and Raman Spectroscopy Studiesmentioning

confidence: 82%

Section: Xps Studiesmentioning

confidence: 99%

Section: Pl and Raman Spectroscopy Studiesmentioning

confidence: 99%

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X-ray photoelectron spectroscopy, Raman and photoluminescence studies on formation of defects in Cu:ZnO thin films and its role in nonlinear optical features

Antony¹,

Poornesh

Kityk

et al. 2018

Laser Phys.

View full text Add to dashboard Cite

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“…Meanwhile, the enhancement effect for the DLE peak was dominantly notable with increased ratio of the I DLE / I NBE as shown in Table 3 . Notably, the NBE peak appeared at ≈420 nm rather than ≈370 nm (Stoke shift), which can be induced by the accelerated formation of interstitial zinc at relatively higher temperatures . Providing with interdiffusion of Cu atoms, the formation of Cu acceptor levels can partially contribute to the radiative recombination for PL emission, which resulted in further increases of the PL peaks for the sample fabricated at 600 °C .…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh Responsivity UV Photodetector Based on Cu Nanostructure/ZnO QD Hybrid Architectures

et al. 2019

Small

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Strong near‐surface electromagnetic field formed by collective oscillation of electrons on Cu nanostructure a shows a strong dependence on geometry, offering a promising approach to boost the light absorption of ZnO photoactive layers with enhanced plasmon scattering. Here, a facile way to fabricate UV photodetectors with tunable configuration of the self‐assembled Cu nanostructures on ZnO thin films is reported. The incident lights are effectively confined in ZnO photoactive layers with the existence of the uplayer Cu nanostructures, and the interdiffusion of Cu atoms during fabrication of the Cu nanostructures can improve the carrier transfer in ZnO thin films. The optical properties of the hybrid architectures are successfully tailored over a control of the geometric evolution of the Cu nanostructures, resulting in significantly enhanced photocurrent and responsivity of 2.26 mA and 234 A W−1 under a UV light illumination of 0.62 mW cm−2 at 10 V, respectively. The photodetectors also exhibit excellent reproducibility, stability, and UV–visible rejection ratio (R370 nm/R500 nm) of ≈370, offering an approach of high‐performance UV photodetectors for practical applications.

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“…Cu-doped ZnO films can be produced by a great variety of deposition methods, as DC and RF magnetron sputtering [28], ice-bath assisted sonochemical method [11], sol-gel [29], sol-gel spin coating [30], pulsed laser deposition technique [31], and spray pyrolysis [10,13]. Among the available techniques, spray pyrolysis is especially interesting since it is easily operated, low-cost, reproducible, and can be deposited on substrates with different geometries.…”

Section: Introductionmentioning

confidence: 99%

Structural, electrical and optical properties of copper-doped zinc oxide films deposited by spray pyrolysis

2020

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The effect of copper doping on structural, electrical, and optical properties of zinc oxide films was evaluated. Copper-doped films (ZnO:Cu) were successfully deposited on a glass substrate by spray pyrolysis at doping levels of 0, 2.5, and 7.5 at% (ZnO, ZC2.5, ZC7.5). All films were polycrystalline, single-phase with ZnO hexagonal wurtzite structure. The films presented nanostructured crystallites, from 36.7 to 38.2 nm. Cu doping increased the electrical conductivity of the ZnO films; this change was proportional to the Cu concentration. The films presented high optical transmittance of 70-80% in the visible wavelength. The energy gap decreased upon Cu doping. The photoluminescence spectrum of all films displayed an intense ultraviolet emission and a weaker blue emission. The emissions shifted to lower wavelengths with increasing dopant concentrations. ZC7.5 presented the most promising properties for an application as transparent conducting oxide: intense optical transmittance and UV photoluminescence, also the lowest electrical resistivity.

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Realization of strong violet and blue emissions from ZnO thin films by incorporation of Cu ions

Cited by 31 publications

References 31 publications

X-ray photoelectron spectroscopy, Raman and photoluminescence studies on formation of defects in Cu:ZnO thin films and its role in nonlinear optical features

X-ray photoelectron spectroscopy, Raman and photoluminescence studies on formation of defects in Cu:ZnO thin films and its role in nonlinear optical features

Ultrahigh Responsivity UV Photodetector Based on Cu Nanostructure/ZnO QD Hybrid Architectures

Structural, electrical and optical properties of copper-doped zinc oxide films deposited by spray pyrolysis

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