Photoluminescence study of ZnO nanowires grown by thermal evaporation on pulsed laser deposited ZnO buffer layer

Mohanta, Antaryami; Thareja, R. K.

doi:10.1063/1.2969908

Cited by 26 publications

(11 citation statements)

References 30 publications

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“…These bands are very similar to those observed in the PL spectrum of pure ZnO, which are usually attributed to the band-edge emission originating from the recombination of free excitions [20,43]. The spacing between the two emission peaks is 60.4 meV, which may be caused by the splitting of the free exciton [46]. Another possible origin is the multiphonon replica of free exciton emission, induced by impurities.…”

Section: Resultssupporting

confidence: 62%

Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Dai

Zhou

et al. 2010

Nano Res.

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Pure ZnO hexagonal microwires and Fe(Ⅲ)-doped ZnO microwires (MWs) with a novel rectangular cross section were synthesized in a confined chamber by a convenient one-step thermal evaporation method. An oriented attachment mechanism is consistent with a vapor-solid growth process. Photoluminescence (PL) and Raman spectroscopy of the Fe(Ⅲ)-doped ZnO MWs and in situ spectral mappings indicate a quasi-periodic distribution of Fe(Ⅲ) along a one-dimensional (1-D) superlattice ZnO:ZnFe 2 O 4 wire, while PL mapping shows the presence of optical multicavities and related multimodes. The PL spectra at room temperature show weak near-edge doublets (376 nm and 383 nm) and a broad band (450-650 nm) composed of strong discrete lines, due to a 1-D photonic crystal structure. Such a 1-D coupled optical cavity material may find many applications in future photonic and spintronic devices.

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Section: Resultssupporting

confidence: 62%

Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Dai

Zhou

et al. 2010

Nano Res.

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“…After carefully checked our experimental data and compared with those previously reported spectra [ 103 , 104 , 105 , 106 ], we concluded that the PL peaks in the UV range from 370 to 400 nm are due to near band gap emissions and can be considered as exciton in origin, although it is slightly less than 3.37 eV at room temperature [ 1 , 2 ]. In general, the band gap emission at room temperature is dominated by phonon replica of free exciton due to strong exciton-phonon coupling [ 1 , 2 , 67 ]. This phenomenon was also observed in our experiments.…”

Section: Resultsmentioning

confidence: 99%

“…For ZnO quantum rods, different photoluminescent properties were also observed due to quantum confinement effects [ 66 ]. However, the photoluminescence spectrum of ZnO prepared by physical method such as thermal evaporation deposition showed different emission at various temperatures, for example, bound exciton (3.354 eV), free excitons (3.375 and 3.421 eV), the first/second/third longitudinal optical phonon order replicas (3.315/3.243/3.171 eV) of free exciton (3.375 eV) and donor acceptor pairs (3.188 eV) at low temperature (6 K), the first longitudinal optical phonon replica (3.315 eV) of free exciton at room temperature [ 67 ]. The photoluminescence characteristics of catalyst free ZnO nanowires at different temperatures and excitation intensities were explored by Mohanta and Thareja [ 68 ].…”

Section: Introductionmentioning

confidence: 99%

Organozinc Precursor-Derived Crystalline ZnO Nanoparticles: Synthesis, Characterization and Their Spectroscopic Properties

et al. 2018

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Crystalline ZnO-ROH and ZnO-OR (R = Me, Et, iPr, nBu) nanoparticles (NPs) have been successfully synthesized by the thermal decomposition of in-situ-formed organozinc complexes Zn(OR)2 deriving from the reaction of Zn[N(SiMe3)2]2 with ROH and of the freshly prepared Zn(OR)2 under an identical condition, respectively. With increasing carbon chain length of alkyl alcohol, the thermal decomposition temperature and dispersibility of in-situ-formed intermediate zinc alkoxides in oleylamine markedly influenced the particle sizes of ZnO-ROH and its shape (sphere, plate-like aggregations), while a strong diffraction peak-broadening effect is observed with decreasing particle size. For ZnO-OR NPs, different particle sizes and various morphologies (hollow sphere or cuboid-like rod, solid sphere) are also observed. As a comparison, the calcination of the fresh-prepared Zn(OR)2 generated ZnO-R NPs possessing the particle sizes of 5.4~34.1 nm. All crystalline ZnO nanoparticles are characterized using X-ray diffraction analysis, electron microscopy and solid-state 1H and 13C nuclear magnetic resonance (NMR) spectroscopy. The size effect caused by confinement of electrons’ movement and the defect centres caused by unpaired electrons on oxygen vacancies or ionized impurity heteroatoms in the crystal lattices are monitored by UV-visible spectroscopy, electron paramagnetic resonance (EPR) and photoluminescent (PL) spectroscopy, respectively. Based on the types of defects determined by EPR signals and correspondingly defect-induced probably appeared PL peak position compared to actual obtained PL spectra, we find that it is difficult to establish a direct relationship between defect types and PL peak position, revealing the complication of the formation of defect types and photoluminescence properties.

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“…The degree of crystal orientation is defined as = (002)/ ∑ (ℎ ), where (002) is the intensity of (002) diffraction peak and ∑ (ℎ ) is the intensity of all diffraction peaks [23]. The variation of integrated intensity ratio (002)/ (101) and the FWHM of the (002) plane at 34.4 ∘ with the substrate temperature are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Optical Characterization and Growth Mechanism of Combination of Zinc Oxide Nanowires and Nanorods at Various Substrate Temperatures

Ghosh

Sharma

2013

Journal of Nanomaterials

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We report on the growth of ZnO nanostructures onn-type silicon substrate using pulsed laser deposition technique at substrate temperature ranging from room temperature to 600°C for one hour. We observe both rod- and wire-like structures with different dimensions at room temperature, 150°C, and 450°C substrate temperatures and only wire-like structures at 300°C and 600°C. These combinations of different shapes have been attributed to the initial growth of nanostructures (nucleation sites) on the surface obtained during the deposition for 20 minutes. The narrowing in the full-width-half-maximum of the peak corresponding to (002) plane of XRD is looked upon as another possible explanation. The blue shift of the peak at 396 nm observed in the photoluminescence is due to the quantum confinement. The intensity ofE2(high) mode at 437 cm−1increases indicating improvement in crystallinity with the substrate temperature.

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Photoluminescence study of ZnO nanowires grown by thermal evaporation on pulsed laser deposited ZnO buffer layer

Cited by 26 publications

References 30 publications

Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Formation and optical properties of ZnO:ZnFe2O4 superlattice microwires

Organozinc Precursor-Derived Crystalline ZnO Nanoparticles: Synthesis, Characterization and Their Spectroscopic Properties

Optical Characterization and Growth Mechanism of Combination of Zinc Oxide Nanowires and Nanorods at Various Substrate Temperatures

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