Photoluminescence from c-axis oriented ZnO films synthesized by sol-gel with diethanolamine as chelating agent

Marin, Oscar; Tirado, Mónica; Budini, Nicolás; Figueroa, Carlos; Comedi, D.

doi:10.1016/j.mssp.2016.07.007

Cited by 29 publications

(14 citation statements)

References 36 publications

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“…Even though it is not possible to state without a doubt the microscopic origin of the PL A c c e p t e d M a n u s c r i p t evolution and the type of defects created, oxygen vacancies can be considered as possible candidates. This is mainly due to the fact that the visible emission is centered at the yellow, which has been associated with transitions involving oxygen vacancies [14,16]. In addition, the oxygen vacancy has lower formation energy than other point defects [45].…”

Section: Discussionmentioning

confidence: 99%

“…, where D is the crystallite size, K is a shape factor (~0.9), λ is the X-ray wavelength, β is the diffraction peak FWHM and θ is the Bragg angle [14].…”

Section: Morphology and Crystalline Structurementioning

confidence: 99%

“…Some of these properties can be tuned by varying the structure morphology (particle size, aspect ratio, surface area, shape, which depends on the growth methods and synthesis conditions [9,10]. properties [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Metastability effects on the photoluminescence of ZnO nano-micro structures grown at low temperature and influence of the precursors on their morphology and structure

González¹,

Marin²,

Tirado³

et al. 2018

Mater. Res. Express

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Nanocrystalline ZnO films were grown on silicon substrate by hydrothermal synthesis at 125 °C, using diethanolamine as additive. A powder containing ZnO spheres, with diameters between 100 to 200 nm and formed by aggregation of ZnO nanoparticles, was also obtained as a secondary reaction product. The samples were studied by scanning electron microscopy, X-ray diffraction and photoluminescence (PL) spectroscopy. The effects of the [diethanolamine]/[Zn 2+ ] molar ratio on morphological, structural and optical properties were studied, as well as the effect of laser illumination (λ=325 nm) and annealing treatment on photoluminescence properties. The film samples exhibited a compact columnar structure, with thickness between 180 to 210 nm, which were not strongly affected by the diethanolamine concentration. The X-ray diffraction patterns from the films evidenced preferred orientation along the c-axis of the ZnO wurzite structure; while the nanospheres did not show any preferential crystalline direction. The PL spectra from the films showed large initial UV emission and a weak defect band centered in the yellow. A PL evolution while the samples were UV illuminated was observed. The relaxation of metastable phases (formed during the low temperature growth) involving the creation of point defects, is suggested. The predominance of the

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Section: Discussionmentioning

confidence: 99%

“…, where D is the crystallite size, K is a shape factor (~0.9), λ is the X-ray wavelength, β is the diffraction peak FWHM and θ is the Bragg angle [14].…”

Section: Morphology and Crystalline Structurementioning

confidence: 99%

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Metastability effects on the photoluminescence of ZnO nano-micro structures grown at low temperature and influence of the precursors on their morphology and structure

González¹,

Marin²,

Tirado³

et al. 2018

Mater. Res. Express

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“…There have been many reports of doping of ZnO [14][15][16]. ZnO:Al (also known as AZO) is probably the most studied case mainly due to its convenient combination of high electrical conductivity and high optical transparency [24].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…This is because the properties of pure ZnO are themselves very sensitive to the crystal growth conditions and postgrowth processing. For example, annealing treatments in oxygen rich atmospheres can change the photoluminescence of ZnO samples synthesized by sol-gel [16]; by using the vapor transport technique it is possible to control the morphology of ZnO nanostructures by changing the type of substrate and the ratio between oxygen pressure and local Zn partial pressure during growth [17]. A different way to improve physical…”

Section: Introductionmentioning

confidence: 99%

Structural, optical and vibrational properties of ZnO:M (M=Al3+ and Sr2+) nano and micropowders grown by hydrothermal synthesis

Marin

Soliz

Gutierrez

et al. 2019

Journal of Alloys and Compounds

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Powders of ZnO and ZnO:M (M = Al 3+ and Sr 2+) with 1 and 4% of M nominal content were synthetized by a hydrothermal method in a diethanolamine (DEA) medium. The samples were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), micro-Raman and photoluminescence (PL). The powder particles were spherical with average radius decreasing from 1 µm down to 70 nm with increasing Al 3+ nominal content but nearly independent on the Sr 2+ nominal content. The XRD and micro-Raman results indicate that both Al 3+ and Sr 2+ mostly incorporated substitutionally into the ZnO lattice, giving rise to compressive and tensile strain, respectively, as a result of ionic radii differences. The PL spectra for ZnO:Al exhibit a dopant-induced contribution at ∼3.1 eV, which is not observed for ZnO:Sr, due to radiative transitions involving trapping of photocarriers at theoretically expected substitutional Al 3+ donor states or at Zn interstitial defects.

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Photonic Physical Reservoir Computing with Tunable Relaxation Time Constant

Yamazaki,

Kinoshita

2023

Advanced Science

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Recent years have witnessed a rising demand for edge computing, and there is a need for methods to decrease the computational cost while maintaining a high learning performance when processing information at arbitrary edges. Reservoir computing using physical dynamics has attracted significant attention. However, currently, the timescale of the input signals that can be processed by physical reservoirs is limited by the transient characteristics inherent to the selected physical system. This study used an Sn‐doped In2O3/Nb‐doped SrTiO3 junction to fabricate a memristor that could respond to both electrical and optical stimuli. The results show that the timescale of the transient current response of the device could be controlled over several orders of magnitude simply by applying a small voltage. The computational performance of the device as a physical reservoir is evaluated in an image classification task, demonstrating that the learning accuracy could be optimized by tuning the device to exhibit appropriate transient characteristics according to the timescale of the input signals. These results are expected to provide deeper insights into the photoconductive properties of strontium titanate, as well as support the physical implementation of computing systems.

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Photoluminescence from c-axis oriented ZnO films synthesized by sol-gel with diethanolamine as chelating agent

Cited by 29 publications

References 36 publications

Metastability effects on the photoluminescence of ZnO nano-micro structures grown at low temperature and influence of the precursors on their morphology and structure

Metastability effects on the photoluminescence of ZnO nano-micro structures grown at low temperature and influence of the precursors on their morphology and structure

Structural, optical and vibrational properties of ZnO:M (M=Al3+ and Sr2+) nano and micropowders grown by hydrothermal synthesis

Photonic Physical Reservoir Computing with Tunable Relaxation Time Constant

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