Effects of Chemical Treatment on the Luminescence of ZnO

Dierre, Benjamin; Yuan, Xiaoli; Armani, N.; Fabbri, Filippo; Salviati, G.; Ueda, Kazuyuki; Sekiguchi, Takashi

doi:10.1007/s11664-010-1124-5

Cited by 4 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figures 12(b) and (c) show the respective CL images of the O-and Zn-faces irradiated for 3600 s. The luminescence is weaker in the irradiated than in the unirradiated area for the O-face, but it is stronger for the Zn-face. This experiment suggests that the surface plays an important role in the variation of the intensity during CL measurements [71].…”

Section: Variation Of the CL Intensity During The Measurementsmentioning

confidence: 71%

“…We have observed a significant degradation of the CL intensity in ZnO [21,22,70,71]. Figure 12(a) shows the CL spectra of a bulk ZnO polycrystal and nanorod-structured ZnO tetrapods, after 20 and 3600 s of irradiation at 5 kV.…”

Section: Variation Of the CL Intensity During The Measurementsmentioning

confidence: 96%

“…Relatively high energy of the electron beam increases the chance of sample damage during the CL measurements as compared to PL. This damage can occur via different mechanisms, such as adsorption/desorption or charging at the surfaces, creation or activation of defects, etc [64][65][66][67][68][69][70][71]. Such e-beam induced effects reduce the reliability of quantitative CL measurements.…”

Section: Variation Of the CL Intensity During The Measurementsmentioning

confidence: 99%

See 2 more Smart Citations

Low-energy cathodoluminescence microscopy for the characterization of nanostructures

Dierre

Yuan

Sekiguchi

2010

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

Spatially and spectrally resolved low-energy cathodoluminescence (CL) microscopy was applied to the characterization of nanostructures. CL has the advantage of revealing not only the presence of luminescence centers but also their spatial distribution. The use of electrons as an excitation source allows a direct comparison with other electron-beam techniques. Thus, CL is a powerful method to correlate luminescence with the sample structure and to clarify the origin of the luminescence. However, caution is needed in the quantitative analysis of CL measurements. In this review, the advantages of cathodoluminescence for qualitative analysis and disadvantages for quantitative analysis are presented on the example of nanostructures.

show abstract

Section: Variation Of the CL Intensity During The Measurementsmentioning

confidence: 71%

Section: Variation Of the CL Intensity During The Measurementsmentioning

confidence: 96%

Section: Variation Of the CL Intensity During The Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Low-energy cathodoluminescence microscopy for the characterization of nanostructures

Dierre

Yuan

Sekiguchi

2010

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

show abstract

“…Dierre et al studied the CL of the O-face and Zn-face of ZnO crystal under electron beam irradiation and found that the enhancement effect at the initial stage was only observed on the Zn-face sample, which suggests the UV enhancement is indeed due to the desorption of negative ions (e.g. O 2− and OH − ) from the surface [27,28]. For a higher accelerating voltage of 10 kV, the UV emission intensity decreases with electron beam exposure time, which is likely caused by the dissociation of hydrogen bound in oxygen vacancies [27].…”

Section: Resultsmentioning

confidence: 99%

Stability of hydrogen incorporated in ZnO nanowires by plasma treatment

Li¹,

Zhong²,

Tokizono³

et al. 2011

Nanotechnology

View full text Add to dashboard Cite

The stability of hydrogen in ZnO is studied using hydrogenated nanowires by plasma treatment. Enhanced near band edge UV emission and reduced defect level green emission is observed after hydrogen plasma treatment. Through thermal stability tests, this effect is found to be stable at room temperature and nearly stable up to ~500 K, but begins to deteriorate at higher temperature. The study of the irradiation stability of the hydrogen in ZnO nanowires shows that the hydrogen is stable under an electron beam with an accelerating voltage lower than 5 kV, but is not stable under 10 kV or under an intensive laser beam. The results could benefit the further understanding of the role of hydrogen in ZnO and light-emitting devices based on hydrogenated ZnO.

show abstract

“…The desorption of the hydroxyl groups ͑13.0 s͒, which can affect the surface band bending, 18,[44][45][46] may cause the increase in the UV intensity at the Zn-face. 47 It is intriguing that the O + peak at 14.2 s TOF is observed for the clean O-face but not the clean Zn-face ͑Fig. 2͒, and that it increases for the unclean O-face while it decreases for the unclean Zn-face for 1.5 keV irradiation ͑Fig.…”

Section: Discussionmentioning

confidence: 99%

Hydrogen released from bulk ZnO single crystals investigated by time-of-flight electron-stimulated desorption

Dierre

Yuan

Ueda

et al. 2010

Journal of Applied Physics

View full text Add to dashboard Cite

Electron beam (e-beam) irradiation effects on ZnO single crystals have been investigated by using time-of-flight electron-stimulated desorption (TOF-ESD). The samples were irradiated by using a continuous 0.5 or 1.5 keV e-beam, while the TOF-ESD spectra were taken by using a pulsed 0.5 keV e-beam. For both the O-terminated and Zn-terminated surfaces, the major desorption is H+ desorption. The main trend of H+ desorption intensity and evolution as a function of irradiation time is similar for both faces. The H+ peak is much higher after 1.5 keV irradiation than after 0.5 keV irradiation. The intensity of the H+ peak decreases exponentially as a function of irradiation time and partially recovers after the irradiation is stopped. These observations suggest that the main contribution of the H+ desorption is hydrogen released from the dissociation of H-related defects and complexes in the bulk region of the ZnO by e-beam irradiation. This finding can be used to explain the reported ultraviolet degradation of ZnO single crystals under electron irradiation observed by cathodoluminescence. The surfaces play a lesser role for the H+ desorption, as there are differences of the decreasing rate between the two faces and additionally the intensity of the H+ peak for both the unclean O-face and Zn-facesis smaller than that for clean faces. While the H+ desorption is mainly dominated by the bulk region, O+ desorption is more influenced by the surfaces. There are two kinds of O+ desorbed from ZnO having 13.0 μs TOF and 14.2 μs TOF. The O+ desorption depends on the surface polarity, the surface conditions and the energy used for irradiation.

show abstract

Effects of Chemical Treatment on the Luminescence of ZnO

Cited by 4 publications

References 21 publications

Low-energy cathodoluminescence microscopy for the characterization of nanostructures

Low-energy cathodoluminescence microscopy for the characterization of nanostructures

Stability of hydrogen incorporated in ZnO nanowires by plasma treatment

Hydrogen released from bulk ZnO single crystals investigated by time-of-flight electron-stimulated desorption

Contact Info

Product

Resources

About