ZnO nanoparticles: Structural, optical and photoconductivity characteristics

Mishra, Sheo K.; Srivastava, Rajneesh; Prakash, Satya

doi:10.1016/j.jallcom.2012.06.024

Cited by 98 publications

(38 citation statements)

References 60 publications

(87 reference statements)

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“…[43,49] Further, the blue emission lies with transitions from Zn i states (or extended Zn i states) to V Zn states or VB. [43,46,[50][51][52][53] The next mid-visible PL that we observed is blue-green emission centered at~2.56 eV associate to a radiative transition of an electron from the shallow donor level of Zn i to an acceptor level of neutral V Zn . [46,50] Recently, it was reported that the V O and V Zn defects are responsible for the deep band emission and V Zn -related defects are present at an energy level equal to 2.53 eV.…”

Section: Pl Properties Of the Zno Nano-leaves And Nano-rodsmentioning

confidence: 62%

“…[43,46,[50][51][52][53] The next mid-visible PL that we observed is blue-green emission centered at~2.56 eV associate to a radiative transition of an electron from the shallow donor level of Zn i to an acceptor level of neutral V Zn . [46,50] Recently, it was reported that the V O and V Zn defects are responsible for the deep band emission and V Zn -related defects are present at an energy level equal to 2.53 eV. [47,54,55] Further, green and yellow emission results from the recombination of a delocalized electron close to the conduction band with a deeply trapped hole in the V O and O i centers in the bulk, respectively.…”

Section: Pl Properties Of the Zno Nano-leaves And Nano-rodsmentioning

confidence: 62%

“…So far, reported violet emission (~2.9 eV) in synthesized ZnO nanoparticles is ascribed to an electron transition from a shallow donor level of neutral Zn i to the top level of the valence band (Zn i fi VB transition). [43,[46][47][48] However, it is also interesting to note than an evaluation of O i at only 0.4 eV above the VB, leads to the possibility of a CB fi O i transition of 2.96 or 419 nm. [43,49] Further, the blue emission lies with transitions from Zn i states (or extended Zn i states) to V Zn states or VB.…”

Section: Pl Properties Of the Zno Nano-leaves And Nano-rodsmentioning

confidence: 99%

See 2 more Smart Citations

Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods

Validžić

Mitrić

Ahrenkiel

et al. 2015

Metall Mater Trans A

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Section: Pl Properties Of the Zno Nano-leaves And Nano-rodsmentioning

confidence: 62%

Section: Pl Properties Of the Zno Nano-leaves And Nano-rodsmentioning

confidence: 62%

Section: Pl Properties Of the Zno Nano-leaves And Nano-rodsmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods

Validžić

Mitrić

Ahrenkiel

et al. 2015

Metall Mater Trans A

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“…The width of the UV emission indicates that the peak consists of more than one emission. The PL spectrum also revealed a strong emission wavelength of 470 nm (blue region), which was attributed to singlet ionized VZ n − [12,31]. For further analysis of the PL emission of the prepared ZnO, the 25 mM sample was chosen.…”

Section: Resultsmentioning

confidence: 99%

A Study on the UV Photoresponse of Hydrothermally Grown Zinc Oxide Nanorods With Different Aspect Ratios

et al. 2015

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We report on the effect of the aspect ratio of zinc oxide (ZnO) nanorods (NRs) prepared via the hydrothermal process. It was found that increasing the precursor molar amount resulted in the decrease of the aspect ratio of ZnO NRs. Furthermore, the aspect ratios showed a significant effect on the structural and optical properties of the prepared ZnO NRs. The ZnO NRs were fabricated into a metal-semiconductor-metal (MSM) UV photodetector. The performances of the prepared MSM ZnO NRs were also studied and the heights aspect ratio showed that the highest responsivity had a value of 33 A/W at bias voltage of 5V and a wavelength of 380 nm. The responsivity, rise and full time of the prepared ZnO NRs showed a trend of behavior as the molar amount of the precursor was varied.

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“…Again, the optical properties were explored at room temperature by UV-visible absorption spectroscopy (UV 2450, Shimadzu) and photoluminescence (PL) spectroscopy (PerkinElmer LS 55). The photoconductivity characteristics of the samples were studied by recording the current in dark and in presence of UV light using a cell type device [18,19]. The device was prepared by putting a layer of the powdered sample in between two Cu electrodes having a spacing of 1 mm and area of illumination is 0.25 cm 2 with a stabilized dc field (50-500 V/cm) across the cell.…”

Section: Characterization Of the Nanostructuresmentioning

confidence: 99%

Enhanced vacuum-photoconductivity of chemically synthesized ZnO nanostructures

Bayan

Mishra

Chakraborty

et al. 2014

Philosophical Magazine

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We report on the enhanced ultraviolet (UV) photoconductivity of zinc oxide (ZnO) nanostructures in vacuum. Nanoparticles and nanorods of ZnO were fabricated using a simple cost-effective solid state grinding method. Morphology of the nanostructures was studied using transmission electron microscopy, while the optical properties were investigated using UV-visible absorption and photoluminescence spectroscopy. The emission spectra of the nanostructures revealed the existence of various native defect states of ZnO and also indicated the presence of surface adsorbed water molecules. In the photoconductivity measurements, although the ZnO nanoparticles exhibited lower photoconductivity in comparison to the nanorods, a similar trend of photoresponse was observed for both the cases. An initial decrease in the photoconductivity followed by a large enhancement was observed in vacuum compared to that in ambient condition. Such unusually increased photoconductivity has been correlated to the desorption of physisorbed water molecules from nanostructure surfaces under vacuum. This desorption is responsible for the rise in dark current and an initial decrease in photoconductivity. Continual UV irradiation in vacuum leads to the desorption of chemisorbed water molecules from the defect sites of the nanostructures, resulting in the occurrence of high photoconductivity.

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ZnO nanoparticles: Structural, optical and photoconductivity characteristics

Cited by 98 publications

References 60 publications

Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods

Microstructural Analysis and the Multicolor UV/Violet/Blue/Green/Yellow PL Observed from the Synthesized ZnO Nano-leaves and Nano-rods

A Study on the UV Photoresponse of Hydrothermally Grown Zinc Oxide Nanorods With Different Aspect Ratios

Enhanced vacuum-photoconductivity of chemically synthesized ZnO nanostructures

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