A.C. Galca

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Structural and optical properties of optimized amorphous GeTe films for memory applications

A.C. Galca, F. Sava, I.D. Simandan, C. Bucur, more

Journal of Non-Crystalline Solids > 2018 > 499 > C > 1-7

Chalcogenide amorphous materials, such as GeTe, are known to exhibit deposition dependent optical and structural properties. The formation of a single and homogeneous amorphous GeTe (a-GeTe) phase is questionable since the deposited films can be mixtures of monoelemental nanoclusters. In this work, we employed two deposition techniques, pulsed laser deposition from a polycrystalline GeTe target and...

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Effect of mixing complexing agents on the properties of electrodeposited CZTS thin films

M.Y. Zaki, K. Nouneh, M. Ebn Touhami, R.A. Belakhmima, more

Optical Materials > 2018 > 83 > C > 252-256

This work involves the synthesis and characterization of Cu₂ZnSnS₄ (CZTS) layers. The films were prepared on ITO/glass substrate by ecofriendly and simple single-step electrodeposition method followed by sulfurization and annealing at 500 °C under Argon flow. By using two different complexing agents, the electrodeposition process can give better results. Therefore, the effect of combining the trisodium...

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Effect of Li doping on the electric and pyroelectric properties of ZnO thin films

L.M. Trinca, A.C. Galca, A.G. Boni, M. Botea, more

Applied Surface Science > 2018 > 427 > PA > 29-37

Un-doped ZnO (UDZO) and Li-doped ZnO (LZO) polycrystalline thin films were grown on platinized silicon by pulsed laser deposition (PLD). The electrical properties were investigated on as-grown and annealed UDZO and LZO films with capacitor configuration, using top and bottom platinum electrodes. In the case of the as-grown films it was found that the introduction of Li increases the resistivity of...

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On the growth of conductive aluminum doped zinc oxide on 001 strontium titanate single crystals

L.M. Trinca, A.C. Galca, G. Aldica, R. Radu, more

Applied Surface Science > 2016 > 364 > C > 365-370

Aluminum doped zinc oxide (AZO) thin films were obtained by pulsed laser deposition on (001) SrTiO₃ (STO) on a range of substrate temperatures during ablation between 300°C and 600°C. A hexagonal system lying on a cubic one should be difficult to be obtained in epitaxial form. The geometrical selection of the AZO growth on (001) STO is not giving a unique preferential orientation. Two orientations,...

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Thin films of amorphous Ga2S3 and rare-earth sulphides

M. Popescu, A. Lőrinczi, F. Sava, A. Velea, more

Materials Letters > 2015 > 142 > Complete > 229-231

The aim of this research is to prepare amorphous thin films of undoped gallium sulphide and doped with rare-earth sulphides, of rare-earth sulphides and to investigate their physical properties. We have prepared thin amorphous films of Ga ₂ S ₃ , EuS, Er ₂ S ₃ , Gd ₂ S ₃ , and Ga ₂ S ₃ doped with rare-earth sulphides (Ga ₂ S ...

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Pulsed laser deposition of nanocrystalline SiC films

G. Socol, A.C. Galca, D. Craciun, M. Hanna, more

Applied Surface Science > 2014 > 306 > Complete > 66-69

Thin SiC films were grown on (100) Si substrates at temperatures from 400 to 1000°C under various CH ₄ pressures by the pulsed laser deposition (PLD) technique using a KrF excimer laser. After deposition, films were in situ annealed at their deposition temperature under 500mbar of CH ₄ for 1.0–1.5h. X-ray reflectivity investigations showed that films exhibited mass densities similar...

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Nanomechanical characterization of bioglass films synthesized by magnetron sputtering

A.C. Popa, V.M.F. Marques, G.E. Stan, M.A. Husanu, more

Thin Solid Films > 2014 > 553 > Complete > 166-172

Bioactive glasses are osteoproductive-type inorganic materials possessing the highest indices of bioactivity in both bulk and thin film forms. The prerequisites for reliable implant-type coatings are both their biological and mechanical performances. Whilst the bioglass films' structural, chemical and biological properties have been studied extensively, information about their mechanical performance...

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Stoichiometry dependence of the optical properties of amorphous-like Inx−wGawZn1−xO1+0.5x−δ thin films

A.C. Galca, G. Socol, L.M. Trinca, V. Craciun

Applied Surface Science > 2013 > 281 > Complete > 96-99

The paper investigates the dependence of the optical properties on cation concentration of amorphous-like indium gallium zinc oxide thin films (Inx−wGawZn _1−x O _1+0.5x−δ ) with various (In+Ga)/(In+Ga+Zn) and Ga/(In+Ga) ratios obtained by pulsed laser deposition. X-ray reflectivity and spectroscopic ellipsometry thickness results were in good agreement. The proportionality between density...

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Strong bonding between sputtered bioglass–ceramic films and Ti-substrate implants induced by atomic inter-diffusion post-deposition heat-treatments

G.E. Stan, A.C. Popa, A.C. Galca, G. Aldica, more

Applied Surface Science > 2013 > 280 > Complete > 530-538

Bioglasses (BG) are the inorganic materials exhibiting the highest indices of bioactivity. Their appliance as films for bio-functionalization of metallic implant surfaces has been regarded as an optimal solution for surpassing their limited bulk mechanical properties. This study reports on magnetron sputtering of alkali-free BG thin films by varying the target-to-substrate working distance, which...

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Pulsed laser deposition of transparent conductive oxide thin films on flexible substrates

G. Socol, M. Socol, N. Stefan, E. Axente, more

Applied Surface Science > 2012 > 260 > Complete > 42-46

The influence of target–substrate distance during pulsed laser deposition of indium zinc oxide (IZO), indium tin oxide (ITO) and aluminium-doped zinc oxide (AZO) thin films grown on polyethylene terephthalate (PET) substrates was investigated. It was found that the properties of such flexible transparent conductive oxide (TCO)/PET electrodes critically depend on this parameter. The TCO films that...

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Double layer structure of ZnO thin films deposited by RF-magnetron sputtering on glass substrate

C. Besleaga, G.E. Stan, A.C. Galca, L. Ion, more

Applied Surface Science > 2012 > 258 > 22 > 8819-8824

Transparent ZnO films are synthesized by RF-magnetron sputtering (1.78MHz) onto glass substrates, using a mild-pressed ZnO powder target. The depositions were carried at three inert argon pressures (0.25Pa, 0.30Pa, and 0.45Pa) at two substrate temperatures (100°C and 400°C). The role of the sputtering conditions on ZnO thin films nanostructuring, optical properties and morphology is investigated by...

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Spectroscopic ellipsometry investigations of Eu-doped oxy-fluoride glass and glass-ceramics

A.C. Galca, N. Preda, C.E. Secu, C.R. Luculescu, more

Optical Materials > 2012 > 34 > 8 > 1493-1496

Oxyfluoride glass-ceramics in the system SiO ₂ –Al ₂ O ₃ –CaF ₂ –EuF ₃ containing Eu ³⁺ -doped CaF ₂ nanocrystals were produced by using controlled crystallization of melt-quenched glass. X-ray diffraction and scanning electron microscopy data have revealed the formation of CaF ₂ nanocrystals of about 50nm size. The Eu ³⁺ -dopant...

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Ferroelectric and dielectric multilayer heterostructures based on KTa0.65Nb0.35O3 and Bi1.5-xZn0.92-yNb1.5O6.92–1.5x-y grown by pulsed laser deposition and chemical solution deposition for high frequency tunable devices

A. Le Febvrier, S. Députier, V. Bouquet, V. Demange, more

Thin Solid Films > 2012 > 520 > 14 > 4564-4567

Epitaxial growth of Bi _1.5–x Zn _0.92–y Nb _1.5 O _{6.92–1.5x–y} (BZN) thin films was achieved on (100) _pc LaAlO ₃ substrate by pulsed laser deposition (PLD) and by chemical solution deposition based on Pechini process. Effect of bismuth and zinc deficiency on the BZN thin films obtained by PLD was discussed, in relation with the starting target composition...

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Optical properties of amorphous-like indium zinc oxide and indium gallium zinc oxide thin films

A.C. Galca, G. Socol, V. Craciun

Thin Solid Films > 2012 > 520 > 14 > 4722-4725

The paper presents the optical properties of amorphous-like indium zinc oxide and indium gallium zinc oxide thin films with various In/(In+Zn) ratios obtained by Pulsed Laser Deposition. Thickness results obtained from simulations of X-ray Reflectivity and Spectroscopic Ellipsometry data were very similar. The dependence of density on stoichiometry resembles the corresponding dependence of the refractive...

article

High quality amorphous indium zinc oxide thin films synthesized by pulsed laser deposition

G. Socol, D. Craciun, I.N. Mihailescu, N. Stefan, more

Thin Solid Films > 2011 > 520 > 4 > 1274-1277

Indium zinc oxide films were grown from targets with two different In atomic concentration [In/(In+Zn)] of 40% and 80% by the pulsed laser deposition technique on glass substrates from room temperature up to 100°C. X-ray diffraction and reflectometry investigations showed that films were amorphous and dense. Thin films (thickness<100nm) exhibited higher optical transmittance and resistivities than...

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Carbon layers cleaning from inside of narrow gaps by a RF glow discharge

C. Stancu, M. Teodorescu, A.C. Galca, G. Dinescu

Surface & Coatings Technology > 2011 > 205 > Supplement 2 > S435-S438

The paper focuses on the utilization of radiofrequency discharges at intermediate pressures for plasma removal of carbon residuals or layers from narrow gaps and channels. It is shown that by proper handling of the discharge power and pressure it is possible to control the development of plasma inside narrow gaps, in the proximity of surfaces to be cleaned. The discharge operation inside gaps having...

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Substrate–target distance dependence of structural and optical properties in case of Pb(Zr,Ti)O3 films obtained by pulsed laser deposition

A.C. Galca, V. Stancu, M.A. Husanu, C. Dragoi, more

Applied Surface Science > 2011 > 257 > 14 > 5938-5943

The paper presents the influence of pulsed laser deposition (PLD) parameters on the structural and optical properties of PZT thin films grown on platinum substrate. X-ray diffraction (XRD), spectroscopic ellipsometry (SE) and X-ray photoelectron spectroscopy (XPS) are used to determine the thin film properties. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) are employed to get...

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Band-gap correlations in Bi4Ge3O12 amorphous and glass–ceramic materials

S. Polosan, A.C. Galca, M. Secu

Solid State Sciences > 2011 > 13 > 1 > 49-53

The Bi ₄ Ge ₃ O ₁₂ (BGO) glass materials were sintered from a mixture of oxides powders, rapidly heated and melted at 1323 K and poured on the graphite plates heated at different temperatures. Their optical properties are compared with BGO single crystals being strongly dependent by the experimental conditions, which influence the further stability of the samples. The dielectric...

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Optical and structural studies on Ba(Mg1/3Ta2/3)O3 thin films obtained by radiofrequency assisted pulsed plasma deposition

N.D. Scarisoreanu, A.C. Galca, L. Nedelcu, A. Ioachim, more

Applied Surface Science > 2010 > 256 > 22 > 6526-6530

Single-phase Ba(Mg _1/3 Ta _2/3 )O ₃ thin films were prepared by radiofrequency plasma beam assisted pulsed laser deposition (RF-PLD) starting from a bulk ceramic target synthesized by solid state reaction. Atomic force microscopy, X-ray diffraction and spectroscopic ellipsometry were used for morphological, structural and optical characterization of the BMT thin films. The X-ray...

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Optical properties of zinc oxide thin films doped with aluminum and lithium

A.C. Gâlcă, M. Secu, A. Vlad, J.D. Pedarnig

Thin Solid Films > 2010 > 518 > 16 > 4603-4606

Aluminum doped Zinc Oxide (AZO) and Lithium doped Zinc Oxide (LZO) thin films are obtained by Pulsed Laser Deposition (PLD) method. These films are characterized by using Spectroscopic Ellipsometry (SE), X-ray Diffraction (XRD) and Photoluminescence (PL). By modeling the ellipsometry spectra we get the dielectric functions, the optical band gap E _g , and the electrical properties. Our results...

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Search results for: A.C. Galca

Structural and optical properties of optimized amorphous GeTe films for memory applications

Effect of mixing complexing agents on the properties of electrodeposited CZTS thin films

Effect of Li doping on the electric and pyroelectric properties of ZnO thin films

On the growth of conductive aluminum doped zinc oxide on 001 strontium titanate single crystals

Thin films of amorphous Ga2S3 and rare-earth sulphides

Pulsed laser deposition of nanocrystalline SiC films

Nanomechanical characterization of bioglass films synthesized by magnetron sputtering

Stoichiometry dependence of the optical properties of amorphous-like Inx−wGawZn1−xO1+0.5x−δ thin films

Strong bonding between sputtered bioglass–ceramic films and Ti-substrate implants induced by atomic inter-diffusion post-deposition heat-treatments

Pulsed laser deposition of transparent conductive oxide thin films on flexible substrates

Double layer structure of ZnO thin films deposited by RF-magnetron sputtering on glass substrate

Spectroscopic ellipsometry investigations of Eu-doped oxy-fluoride glass and glass-ceramics

Ferroelectric and dielectric multilayer heterostructures based on KTa0.65Nb0.35O3 and Bi1.5-xZn0.92-yNb1.5O6.92–1.5x-y grown by pulsed laser deposition and chemical solution deposition for high frequency tunable devices

Optical properties of amorphous-like indium zinc oxide and indium gallium zinc oxide thin films

High quality amorphous indium zinc oxide thin films synthesized by pulsed laser deposition

Carbon layers cleaning from inside of narrow gaps by a RF glow discharge

Substrate–target distance dependence of structural and optical properties in case of Pb(Zr,Ti)O3 films obtained by pulsed laser deposition

Band-gap correlations in Bi4Ge3O12 amorphous and glass–ceramic materials

Optical and structural studies on Ba(Mg1/3Ta2/3)O3 thin films obtained by radiofrequency assisted pulsed plasma deposition

Optical properties of zinc oxide thin films doped with aluminum and lithium

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