Cathodoluminescence of ZnO Films

Fu, Zhaoming; Guo, Changxin; Lin, Bing; Liao, Gui-Hong

doi:10.1088/0256-307x/15/6/025

Cited by 106 publications

(50 citation statements)

References 11 publications

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“…Shallow acceptor levels are created at 0.3 and 0.4 eV above the top of the valence band (VB) due to zinc vacancy (V Zn ) and oxygen interstitial (O i ), respectively. Again, zinc interstitial (Zn i ) produces a shallow donor level at 0.5 eV below the bottom of CB (Samanta and Chaudhuri 2011;Samanta et al 2009a, b, c;Vanheusden et al 1996;Jeong et al 2003;Jin et al 2000;Fu et al 1998). In our cases, we observed PL emission (see Fig.…”

Section: Photoluminescence Spectroscopysupporting

confidence: 62%

“…UV emission is the characteristic emission of ZnO arising due to direct band transition. However, visible emission is also reported from ZnO nanostructures owing to various defects (Samanta and Chaudhuri 2011;Samanta et al 2009a, b, c;Vanheusden et al 1996;Jeong et al 2003;Jin et al 2000;Fu et al 1998 , from top to bottom. Shallow acceptor levels are created at 0.3 and 0.4 eV above the top of the valence band (VB) due to zinc vacancy (V Zn ) and oxygen interstitial (O i ), respectively.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 98%

“…7) in the visible region which indicates that the PL emission from the nanorods in this case is dominated by the defect related deep level emission over the band edge UV emission. Various defect energy levels as calculated from full potential linear Muffin-Tin orbital method (Vanheusden et al 1996;Jeong et al 2003;Jin et al 2000;Fu et al 1998;Samanta et al 2009b, c;Lin et al 2011;Xu et al 2003) are shown in Fig. 8.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

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Chemical growth of hexagonal zinc oxide nanorods and their optical properties

Samanta¹,

Bandyopadhyay²

2011

Appl Nanosci

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A simple wet chemical method has been successfully deployed to fabricate hexagonal zinc oxide nanorods. The structural characteristics were investigated through X-ray diffraction. The crystal unit cell of the nanorods was found to be hexagonal. The morphology of the nanostructures was studied using field emission scanning electron microscopy and transmission electron microscopy. The nanorods are hexagonal in shape. The Zn-O bond formation was confirmed through Fourier transformed infrared spectroscopic analysis. Raman shift measurements revealed various vibrational modes present in the ZnO crystal. The photoluminescence spectrum shows shallow deep level visible emission due to various defect states. Thus, our investigation will be very helpful in the development of ZnO based light emitting/optoelectronic device applications.

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Section: Photoluminescence Spectroscopysupporting

confidence: 62%

Section: Photoluminescence Spectroscopymentioning

confidence: 98%

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

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Chemical growth of hexagonal zinc oxide nanorods and their optical properties

Samanta¹,

Bandyopadhyay²

2011

Appl Nanosci

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“…It is known that the UV emission originates from a recombination of free excitons 6) and green emission is related to singly ionized oxygen vacancies 7) and (or) antisite oxygen atoms. 8) As shown in Fig. 6, the intensity of green emission peak increases with the increase in the ratio of O 2 to N 2 , which indicates that more oxygen defects exist in the ZnO nanostructures.…”

Section: Resultsmentioning

confidence: 78%

Effect of the O2/N2 Ratio on the Growth of ZnO Nanostructures on c-Plane Sapphire Substrate via Thermal Evaporation Technique

Lee

2015

Mater. Trans.

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ZnO nanostructures were grown on c-plane sapphire substrate in an oxygen and nitrogen gas environment at 1000°C by thermal evaporation of Zn powder without using catalyst. The ZnO nanostructures were synthesized at different O 2 /N 2 ratios in order to investigate the effect of O 2 /N 2 ratio in ambient gas on the morphology, crystal structure and cathodoluminescence of ZnO nanostructures. No nanostructures were grown on the substrate in a N 2 environment. As the ratio of O 2 to N 2 increased, ZnO nanostructures with wire shape began to be grown on the substrate. In addition, tilted nanowires, which were grown with tilt angles with respect to the substrate plane, were observed. With further increasing the ratio of O 2 to N 2 , the size of nanostructures increased. The intensity of visible emission in CL spectra increased with the increase in the ratio of O 2 to N 2 .

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“…However, the visible emission is possible due to the existence of various defect states of lower energy. 5,20,26,[29][30][31][32][33][34] Nanocrystals grown by chemical methods have plenty of defects. Thus here in our case, PL is dominated by the defect level emission.…”

Section: Photoluminescence and Various Transition Levelsmentioning

confidence: 99%

WEAK QUANTUM CONFINEMENT IN ZnO NANORODS: A ONE DIMENSIONAL POTENTIAL WELL APPROACH

Samanta¹

2011

Opt. Photonic Lett.

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We report here the weak quantum confinement effect in zinc oxide nanorods fabricated by a simple wet chemical method at room temperature. The formation of nanorods was confirmed through X-ray diffraction measurements. The particle size was also determined from the X-ray diffraction pattern and was found to be 20 nm. The band gap was calculated from the UV-Visible spectrum and found to be 3.72 eV, which is higher as compared to the bulk ZnO. It owes its value to the quantum confinement effect. However, the large particle size indicates that the confinement is weak in nature. The photoluminescence spectrum shows a strong emission peak at 421 nm accompanied by several much weaker defect related emissions in the visible region. Using the weak confinement model, we identified the transition levels for those emissions.

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Cathodoluminescence of ZnO Films

Cited by 106 publications

References 11 publications

Chemical growth of hexagonal zinc oxide nanorods and their optical properties

Chemical growth of hexagonal zinc oxide nanorods and their optical properties

Effect of the O<sub>2</sub>/N<sub>2</sub> Ratio on the Growth of ZnO Nanostructures on <i>c</i>-Plane Sapphire Substrate via Thermal Evaporation Technique

WEAK QUANTUM CONFINEMENT IN ZnO NANORODS: A ONE DIMENSIONAL POTENTIAL WELL APPROACH

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