Photoluminescence Studies on ZnO Thin Films Obtained by Sol-Gel Method

Aguilar, Guadalupe Valverde; Fonseca, Mónica R. Jaime; Ramírez, A.J. Morales; Gutiérrez-Gracia, A.

doi:10.5772/intechopen.68529

Cited by 9 publications

(11 citation statements)

References 38 publications

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“…ZnO-based thin films can be prepared using a variety of procedures [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ], such as pulsed-laser [ 20 ], solvothermal/hydrothermal [ 21 , 22 ], electrochemical [ 23 , 24 ] and ultrasonic-mist-vapor deposition methods [ 25 ], spray pyrolysis [ 26 ], magnetron sputtering [ 27 ], microwave-assisted [ 28 ] procedures, and also the sol-gel method (SGM) [ 2 , 12 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ], which is one of the most attractive and highly preferred, due to its low cost, simplicity, and feasibility. In general, the SGM requires a Zn(II) salt, an organic compound as stabilizer, and a solvent […”

Section: Introductionmentioning

confidence: 99%

Influence of the Nature of Aminoalcohol on ZnO Films Formed by Sol-Gel Methods

et al. 2023

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Here we present comparative studies of: (i) the formation of ZnO thin films via the sol-gel method using zinc acetate dihydrate (ZAD), 2-methoxyethanol (ME) as solvent, and the aminoalcohols (AA): ethanolamine, (S)-(+)-2-amino-1-propanol, (S)-(+)-2-amino-3-methyl-1-butanol, 2-aminophenol, and aminobenzyl alcohol, and (ii) elemental analyses, infrared spectroscopy, X-ray diffraction, scanning electron microscopy, absorption and emission spectra of films obtained after deposition by drop coating on glass surface, and thermal treatments at 300, 400, 500 and 600 °C. The results obtained provide conclusive evidences of the influence of the AA used (aliphatic vs. aromatic) on the ink stability (prior to deposition), and on the composition, structures, morphologies, and properties of films after calcination, in particular, those due to the different substituents, H, Me, or iPr, and to the presence or the absence of a –CH2 unit. Aliphatic films, more stable and purer than aromatic ones, contained the ZnO wurtzite form for all annealing temperatures, while the cubic sphalerite (zinc-blende) form was also detected after using aromatic AAs. Films having frayed fibers or quartered layers or uniform yarns evolved to “neuron-like” patterns. UV and photoluminescence studies revealed that these AAs also affect the optical band gap, the structural defects, and photo-optical properties of the films.

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Section: Introductionmentioning

confidence: 99%

Influence of the Nature of Aminoalcohol on ZnO Films Formed by Sol-Gel Methods

et al. 2023

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“…ZnO thin films are usually prepared using methods like sol-gel [16], spray pyrolysis [10], sputtering [3], chemical vapor deposition [17], and pulsed laser deposition [18]… The physical deposition, especially the RF sputtering [19] seems more convenient compared to solution processes in order to get high purity thin films. Moreover, by controlling the deposition parameters, the optimum microstructure with the adapted inter granular porosity can be obtained for better sensing properties.…”

Section: Introductionmentioning

confidence: 99%

Ga doped ZnO thin films deposited by RF sputtering for NO₂ sensing

Presmanes

Gunasekaran

Thimont

et al. 2019

2019 5th Experiment International Conference (exp.at'19)

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Ga doped ZnO thin films have been deposited by Radio-Frequency (RF) magnetron sputtering on fused silica substrates. The structural analysis of the n-type sensitive material showed a preferential orientation in the [00l] direction. The microstructure of the thin film indicated an increasing grain size with the increase of the thicknesses. The micro sensor platforms have been fabricated with ZnO:Ga thin film deposited using a reliable stencil mask onto interdigitated electrodes containing micro-hotplates. The as fabricated micro sensor allowed to sense sub-ppm concentration (500 ppb) of nitrogen dioxide under cycled temperature mode. This system revealed promising sensing performance with a response R/R0 up to 18 at low temperature step (50 °C).

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“…In the case of the MAPLE layer based on ZnO nanoparticles, the UV-Vis spectrum shows a small shoulder at~375 nm due to the ZnO band-to-band transition [11] whereas the PL spectrum discloses an UV emission band, peaked at~375 nm, having an excitonic origin and a visible emission with more components, peaked at~430 nm,~480 nm and~530 nm, originating from defect emissions [25,37]. The origin of these components has not yet been conclusively established, their mechanisms being still under debate [38].…”

Section: Resultsmentioning

confidence: 99%

“…The origin of these components has not yet been conclusively established, their mechanisms being still under debate [38]. The difference between the PL spectrum of the ZnO layer deposited by MAPLE and the PL spectrum of the chemically synthesized ZnO nanoparticles, which is dominated by the visible emission ( Figure 1C), can be explained taking into account that the emission properties can be modified by the compound form, film or powder [37].…”

Section: Resultsmentioning

confidence: 99%

Thin Films Based on Cobalt Phthalocyanine:C60 Fullerene:ZnO Hybrid Nanocomposite Obtained by Laser Evaporation

et al. 2020

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Matrix-assisted pulsed laser evaporation (MAPLE) was used to deposit hybrid nanocomposite thin films based on cobalt phthalocyanine (CoPc), C60 fullerene and ZnO nanoparticles. The inorganic nanoparticles, with a size of about 20 nm, having the structural and optical properties characteristic of ZnO, were chemically synthesized by a simple precipitation method. Furthermore, ZnO nanoparticles were dispersed in a dimethyl sulfoxide solution in which CoPc and C60 had been dissolved, ready for the freezing MAPLE target. The effect of the concentration of ZnO nanoparticles on the structural, morphological, optical and electrical properties of the CoPc:C60:ZnO hybrid nanocomposite layers deposited by MAPLE was evaluated. The infrared spectra of the hybrid nanocomposite films confirm that the CoPc and C60 preserve their chemical structure during the laser deposition process. The CoPc optical signature is recognized in the ultraviolet–visible (UV–Vis) spectra of the obtained layers, these being dominated by the absorption bands associated to this organic compound while the ZnO optical fingerprint is identified in the photoluminescence spectra of the prepared layers, these disclosing the emission bands linked to this inorganic semiconductor. The hybrid nanocomposite layers exhibit globular morphology, which is typical for the thin films deposited by MAPLE. Current-voltage (J-V) characteristics of the structures developed on CoPc:C60:ZnO layers reveal that the addition of an appropriate amount of ZnO nanoparticles in the CoPc:C60 mixture leads to a more efficient charge transfer between the organic and inorganic components. Due to their photovoltaic effect, structures featuring such hybrid nanocomposite thin films deposited by MAPLE can have potential applications in the field of photovoltaic devices.

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Photoluminescence Studies on ZnO Thin Films Obtained by Sol-Gel Method

Cited by 9 publications

References 38 publications

Influence of the Nature of Aminoalcohol on ZnO Films Formed by Sol-Gel Methods

Influence of the Nature of Aminoalcohol on ZnO Films Formed by Sol-Gel Methods

Ga doped ZnO thin films deposited by RF sputtering for NO₂ sensing

Thin Films Based on Cobalt Phthalocyanine:C60 Fullerene:ZnO Hybrid Nanocomposite Obtained by Laser Evaporation

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Photoluminescence Studies on ZnO Thin Films Obtained by Sol-Gel Method

Cited by 9 publications

References 38 publications

Influence of the Nature of Aminoalcohol on ZnO Films Formed by Sol-Gel Methods

Influence of the Nature of Aminoalcohol on ZnO Films Formed by Sol-Gel Methods

Ga doped ZnO thin films deposited by RF sputtering for NO2 sensing

Thin Films Based on Cobalt Phthalocyanine:C60 Fullerene:ZnO Hybrid Nanocomposite Obtained by Laser Evaporation

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Ga doped ZnO thin films deposited by RF sputtering for NO₂ sensing