Optical Properties of as-Grown and Proton Irradiated ZnO

Brink, D. J.; Kunert, H.W.

doi:10.1002/1521-3951(200201)229:2<859::aid-pssb859>3.0.co;2-k

Cited by 12 publications

(10 citation statements)

References 14 publications

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“…Hydrides on the other, nonpolar facets are less stable from DFT calculations, ,, although some calculated geometries found on the (0101̅) facets also explain well the main Zn–H stretching frequency at 1710 cm –1 or the specific Raman feature observed at 1600 cm –1 . This type of hydride on pristine, extended surfaces may be present on ZnO powders where nonpolar facets (101̅0) and (112̅0) are most abundant. , …”

Section: Surface Hydrides On Bulk Oxidesmentioning

confidence: 99%

Isolated Surface Hydrides: Formation, Structure, and Reactivity

et al. 2016

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Surface hydrides are ubiquitous in catalysis. However, their structures and properties are not as well-understood as those of their molecular counterparts, which have been extensively studied for the past 70 years. Hydrides isolated on surfaces have been characterized as stable entities on oxide surfaces or in zeolites. They have also been proposed as reaction intermediates in numerous catalytic processes (hydrogenation, hydrogenolysis, etc.). They have also been prepared via surface organometallic chemistry. In this review, we describe their key structural features and spectroscopic signatures. We discuss their reactivity and stability and also point out unexplored areas.

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Section: Surface Hydrides On Bulk Oxidesmentioning

confidence: 99%

Isolated Surface Hydrides: Formation, Structure, and Reactivity

et al. 2016

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“…The wurtzite ZnO with a wide band gap (3.5 eV at very low temperatures and 3.37 eV at the room temperature [1]) is used in blue and ultra-violet (UV) light emitting devices such as diodes and lasers, as well as daylight-blind UV detectors. Due to its large band gap ZnO is suitable for the solar cells and catalysts fabrication.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it finds application in phosphorus, paints, piezoelectric transducers, varistors and transparent conducting films; the later being important for the photovoltaic industry [2]. Optical properties of ZnO have been reported by many authors [1,[3][4][5][6]. Apart from this, lattice dynamics of ZnO has been extensively investigated both experimentally and theoretically ( [7,8] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Multiphonon processes in ZnO

Kunert

Brink

Auret

et al. 2005

phys. stat. sol. (c)

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PACS 78.30.Fs Using space group theoretical method we have determined the Lattice Mode Representation (LMR) for ZnO with the space group C 6v 4 (P6 3 mc). The reduction of the LMR onto irreducible species of the C 6v 4 space group leads to the total number of independent first order vibrational modes and their symmetries (irreducible representations of G k /T ) originating from the centre (k=0) as well as from the high symmetry points and lines (k ≠ 0) of the hexagonal Brillouin zone (BZ) for ZnO. Considering only long-wave-length modes (k ≅ 0) we have derived Raman selection rules for the first, second, and third order Raman active modes, hereafter referred to as 1RAMs, 2RAMs, and 3RAMs, respectively. We have also performed the back scattering Raman spectroscopy from ZnO in the frequency regions of the 1RAMs, 2RAMs, and 3RAMs. Several muliphonon processes have been observed. In addition, the low temperature photoluminescence (PL) spectra exhibit some phonon replicas confirming the presence of the multiphonon processes in ZnO.

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“…This is the significant difference between our study and previous work regarding the effect of H implantation in ZnO. 6,7 Due to the high implantation energies ranging from 100 keV to 1 MeV in previous studies, the implanted H resided much deeper than the optically active region and showed only the effect of implantation induced damage on the optical properties of ZnO. Half of the hydrogen-implanted samples were annealed in vacuum at 300°C for 15 min.…”

mentioning

confidence: 99%

“…2 a significant decrease in the PL intensity was observed following the He implantation, consistent with previous reports on the highly irradiated ZnO. 6,7 However, the relative intensity of the PL peaks remained unchanged and the peak at 3.364 eV still exhibited the maximum intensity.…”

mentioning

confidence: 99%

Optical observation of donor-bound excitons in hydrogen-implanted ZnO

Lee

Nastasi

Hamby

et al. 2005

Applied Physics Letters

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The optical and structural properties of H or He implanted ZnO were investigated using low temperature photoluminescence (PL) and infrared spectroscopy (IR). H implantation is shown to influence the relative luminescence intensities of the donor bound excitons, enhancing the 3.361 eV peak, and changing the overall intensity of the PL spectrum. PL from He implanted ZnO is used to demonstrate that implantation damage is partially responsible for the variations observed in the PL of H implanted ZnO. IR spectra show that the increase in the relative intensity of the 3.361 eV peak coincides with an appearance of the H vibrational mode in the ZnO lattice. Our results indicate that the implanted H forms O–H bonds at Zn vacancies, and that it is these defect complexes which give rise to the shallow donors participating in the observed bound-exciton luminescence at 3.361 eV.

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Optical Properties of as-Grown and Proton Irradiated ZnO

Cited by 12 publications

References 14 publications

Isolated Surface Hydrides: Formation, Structure, and Reactivity

Isolated Surface Hydrides: Formation, Structure, and Reactivity

Multiphonon processes in ZnO

Optical observation of donor-bound excitons in hydrogen-implanted ZnO

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