Low temperature grown ZnO:Ga films with predominant c-axis orientation in wurtzite structure demonstrating high conductance, transmittance and photoluminescence

Das, Debajyoti; Mondal, Praloy

doi:10.1039/c5ra22288e

Cited by 54 publications

(16 citation statements)

References 51 publications

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“…Figure 6(a–c) represents high-resolution XPS spectra for Zn peaks in the NPs, NSs and NFs samples, respectively. In these spectra, the energy separation between two Zn components; Zn2p 3/2 and Zn2p 1/2 for NPs is 23.11 eV, NSs is 23.09 eV and NFs is 23.13 eV, which are in agreement with the reported values of ZnO 47 , 48 . The difference of binding energies of these deconvoluted peaks for NPs, NSs and NFs (given in Table S2 ) is ascribed to the difference in their morphologies and synthesis approaches 43 , 44 .…”

Section: Resultssupporting

confidence: 89%

Visible and UV photo-detection in ZnO nanostructured thin films via simple tuning of solution method

Khokhra

Bharti

Lee

et al. 2017

Sci Rep

299

118

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This study demonstrates significant visible light photo-detection capability of pristine ZnO nanostructure thin films possessing substantially high percentage of oxygen vacancies and zinc interstitials , introduced by simple tuning of economical solution method. The demonstrated visible light photo-detection capability, in addition to the inherent UV light detection ability of ZnO, shows great dependency of and with the nanostructure morphology. The dependency was evaluated by analyzing the presence/percentage of and using photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS) measurements. Morphologies of ZnO viz. nanoparticles (NPs), nanosheets (NSs) and nanoflowers (NFs), as a result of tuning of synthesis method contended different concentrations of defects, demonstrated different photo-detection capabilities in the form of a thin film photodetector. The photo-detection capability was investigated under different light excitations (UV; 380~420 nm, white ; λ > 420 nm and green; 490~570 nm). The as fabricated NSs photodetector possessing comparatively intermediate percentage of ~ 47.7% and ~ 13.8% exhibited superior performance than that of NPs and NFs photodetectors, and ever reported photodetectors fabricated by using pristine ZnO nanostructures in thin film architecture. The adopted low cost and simplest approach makes the pristine ZnO-NSs applicable for wide-wavelength applications in optoelectronic devices.

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Section: Resultssupporting

confidence: 89%

Visible and UV photo-detection in ZnO nanostructured thin films via simple tuning of solution method

Khokhra

Bharti

Lee

et al. 2017

Sci Rep

299

118

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show abstract

“…The UV-violet emission luminescence peak at about 380 nm (~3.26 eV) can be attributed to electron transition from the CB to a single ionized oxygen vacancy (V O + ) as the responsible acceptor defects located at 0.27 eV above the VB ( Fig. 9(b)) [67]. Two satellite components of violet luminescence are visible in each spectrum.…”

Section: Wwwspringercom/journal/40145mentioning

confidence: 97%

Effect of calcination temperature on structural and optical properties of MAl2O4 (M = Ni, Cu, Zn) aluminate spinel nanoparticles

2019

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NiAl 2 O 4 , CuAl 2 O 4 , and ZnAl 2 O 4 aluminate spinel nanoparticles were synthesized by sol-gel auto combustion method using diethanolamine (DEA) as a fuel. The effects of calcination temperature on structure, crystallinity, morphology, and optical properties of MAl 2 O 4 (M = Ni, Cu, Zn) have been investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), UV-visible diffuse reflectance spectroscopy (UV-DRS), and photoluminescence (PL) spectroscopy. The XRD and FT-IR results confirm the formation of single-phase spinel structure of NiAl 2 O 4 , CuAl 2 O 4 , and ZnAl 2 O 4 at 1200, 1000, and 600 ℃, respectively. The direct band gap of these aluminate spinels, calculated from UV-DRS spectra using the Kubelka-Munk function, is found to increase with calcination temperature. The PL spectra demonstrate that NiAl 2 O 4 gives the highest blue emission intensity, while CuAl 2 O 4 and ZnAl 2 O 4 exhibit a very strong violet emission. During fluorescence process, the ZnAl 2 O 4 emits visible light in only violet and blue regions, while NiAl 2 O 4 and CuAl 2 O 4 emissions extend to the green region. It seems therefore that the transition metal type and intrinsic defects in these aluminate powders are responsible for these phenomena.

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“…7d). In comparison, the binding energy of the peak was reported to be 1022.4 eV [31] and 1023.1 eV [32] for Zn 3 (PO 4 ) 2 , 1021.3 eV [31] and 1022.0 eV [33] for ZnO, and 1021.9 -1022.6 eV for zinc phosphate glasses [31]. ZnSO 4 is one of ash compounds from oil deposits in diesel engines [14], but it is not apparent as far as sulfur presence is concerned.…”

Section: Investigation Of Soot Oxidation Reactivitymentioning

confidence: 99%

Lube oil-dependent ash chemistry on soot oxidation reactivity in a gasoline direct-injection engine

Choi

Seong

2016

Combustion and Flame

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Gasoline particulate filters (GPF) are considered an enabling technology to meet stringent particulate matter (PM) regulations for gasoline direct-injection (GDI) engines, which are known to produce significant PM emissions. While ash loading in filters has been recognized to be detrimental in filter performance by increasing back pressure, increased ash fractions in soot were observed to enhance soot oxidation. GDI soot samples derived from different gasoline/lube oil blends were evaluated to identify potential promoting factors when formulated lube oils were dosed into gasoline fuel. Ca-derived ash enhanced soot oxidation remarkably, while P-and ZDDP-derived ash deteriorated soot oxidation. It is apparent that the promoting effect of lube oil-derived ash is due mainly to the Ca component that is the most abundant among additive components in lube oil. Bulk and surface analyses of these ash compounds indicate that Ca-derived ash would be complex compounds, while the contribution of CaSO 4 , which is one of the most abundant ash compounds from diesel engines, is almost negligible. For the validation of the ash promoting impact in filters, the regeneration experiments were compared for a TWC-coated GPF in a GDI engine before and after ash loading was performed. The pressure drop of the ash-loaded GPF decreased noticeably in the initial regeneration stage and it increased gradually, whereas that of no ashloaded GPF increased gradually without any reduction. So, it is concluded that the ash layer in the GPF assisted soot oxidation in the early regeneration stage when it was in close contact with soot.

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Low temperature grown ZnO:Ga films with predominant c-axis orientation in wurtzite structure demonstrating high conductance, transmittance and photoluminescence

Abstract: Highly conducting and optically transparent ZnO:Ga films with dominant c-axis orientated (I<002>/I<101> ∼ 40) wurtzite structure grown at 50 °C and 50 W RF power in magnetron sputtering exhibit allowed Raman active A1 (LO) mode and intense UV-luminescence.

Cited by 54 publications

References 51 publications

Visible and UV photo-detection in ZnO nanostructured thin films via simple tuning of solution method

Visible and UV photo-detection in ZnO nanostructured thin films via simple tuning of solution method

Effect of calcination temperature on structural and optical properties of MAl2O4 (M = Ni, Cu, Zn) aluminate spinel nanoparticles

Lube oil-dependent ash chemistry on soot oxidation reactivity in a gasoline direct-injection engine

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