Synthesis and optical properties of well-aligned ZnO nanorod array on an undoped ZnO film

Jie, Jiansheng; Wang, Guanzhong; Chen, Yi-Ming; Han, Xinhai; Wang, Qingtao; Bai, Xu; Hou, J. G.

doi:10.1063/1.1854737

Cited by 163 publications

(116 citation statements)

References 24 publications

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“…4. Photoluminescence spectra of ZnO nanorod and CdS-ZnO composite nanorod mode of hexagonal ZnO is observed at 439 cm -1 [13], whereas after CdS deposition, one can observe a couple of peaks at 301 cm -1 and 438 cm -1 . The peak at 301 cm -1 corresponds to 1LO from hexagonal CdS [14].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photocurrent from CdS Sensitized ZnO Nanorods

Nayak

Son²,

Kim

et al. 2012

Journal of Electrical Engineering and Technology

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-Structure and optical properties of cadmium sulphide-zinc oxide composite nanorods have been evaluated by suitable characterization techniques. The X-ray diffraction spectrum contains a series of peaks corresponding to reflections from various sets of lattice planes of hexagonal ZnO as well as CdS. The above observation is supported by the Micro-Raman spectroscopy result. The optical reflectance spectra of CdS-ZnO is compared with that of ZnO where we observe an enhanced absorption and hence diminished reflection from CdS-ZnO compared to that from only ZnO. A very small intensity of the visible photoluminescence peak observed at 550 nm proves that the ZnO nanorods have very low concentrations of point defects such as oxygen vacancies and zinc interstitials. The photocurrent in the visible region has been significantly enhanced due to deposition of CdS on the surface of the ZnO nanorods. CdS acts as a visible sensitizer because of its lower band gap compared to ZnO.

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Section: Resultsmentioning

confidence: 99%

Enhanced Photocurrent from CdS Sensitized ZnO Nanorods

Nayak

Son²,

Kim

et al. 2012

Journal of Electrical Engineering and Technology

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“…1 Most of the previous works about the optical properties of ZnO with various morphologies were conducted in the linear area. [2][3][4][5] More recently, the nonlinear optical properties of ZnO, for instance, second harmonic generation ͑SHG͒, 6-10 third harmonic generation, 11,12 and multiphoton absorption ͑MPA͒ induced luminescence, [13][14][15] have been investigated. However, relatively weak SHG emission to the band edge emission was observed in singlecrystal ZnO bulk.…”

Section: Introductionmentioning

confidence: 99%

Inner surface enhanced femtosecond second harmonic generation in thin ZnO crystal tubes

Zheng

Ning

et al. 2011

Journal of Applied Physics

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At room temperature, efficient second harmonic generation ͑SHG͒ emission is observed in thin ZnO crystal hollow rods ͑tubes͒ with diameter ϳ0.2 mm under the excitation of femtosecond laser from 700 to 860 nm. Power and polarization dependence of the SHG signal on the primary excitation beam is also measured. The multiple total reflections between the outer and inner surfaces of the sample are analyzed to be responsible for the efficient SHG. Ninefold amplification of SHG signal in the tube structure is estimated.

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“…PLD-grown ZnO seed layers have been reported to be excellent substrates for the growth of high quality nanorods by Li et al and Jie et al [7,17]. Fig.…”

Section: Surface Morphologiesmentioning

confidence: 99%

Origin of the 3.331 eV emission in ZnO nanorods: Comparison of vapour phase transport and pulsed laser deposition grown nanorods

Inguva

Gray

McGlynn

et al. 2016

Journal of Luminescence

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*Corresponding authors: saikumar.inguva2@mail.dcu.ie and enda.mcglynn@dcu.ie. KEYWORDSZnO seed layers, vertically aligned ZnO nanorods, vapour phase transport, pulsed laser deposition, 3.331 eV emission. 2 ABSTRACTIn this work, we report the growth of vertically aligned ZnO nanorods with excellent optical quality by both catalyst free vapor phase transport (VPT) and catalyst free pulsed laser deposition (PLD). We compare the near band edge emission of such deposits, with a focus on the identification of the origin of the 3.331 eV emission feature. X-ray diffraction (XRD), scanning electron microscopy (SEM) and low-temperature (13 K) photoluminescence (PL) were used to characterise these nanorod deposits. XRD and SEM data reveal that both techniques lead to highly textured ZnO nanorod arrays with uniform c-axis orientation normal to the substrate surface. The VPT-grown nanorods are well separated and show smooth, facetted surfaces whereas the PLD-grown nanorods are more closely packed and display comparatively rougher surfaces. The optical quality of the samples obtained by both growth methods was very good and low-temperature PL spectra were dominated in both cases by a strong I 6 bound exciton (BX) emission (3.36 eV), and also showed emission from the surface exciton and the free exciton. A comparatively weak visible emission was also observed in samples deposited by both techniques.The main difference between the PLD-and VPT-grown nanorod samples is the presence of the 3.331 eV emission in the former, and its complete absence in the latter (as well as in continuous PLD-grown seed layers) which is discussed in light of the differing surface morphologies mentioned above and which provides strong support for our previous assignment of the origin of this defect to structural defects in the inhomogeneous sub-surface region close to the rough nanorod surface.3

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Synthesis and optical properties of well-aligned ZnO nanorod array on an undoped ZnO film

Cited by 163 publications

References 24 publications

Enhanced Photocurrent from CdS Sensitized ZnO Nanorods

Enhanced Photocurrent from CdS Sensitized ZnO Nanorods

Inner surface enhanced femtosecond second harmonic generation in thin ZnO crystal tubes

Origin of the 3.331 eV emission in ZnO nanorods: Comparison of vapour phase transport and pulsed laser deposition grown nanorods

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