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Effect of RF power on the structural and optical properties of ZnS thin films prepared by RF-sputtering
摘要： Zinc sulphide (ZnS) thin films have grown on glass and Si substrates by reactive cathodic radio frequency (RF) sputtering. The RF power was varied in the range of 100 to 250 W, while the deposition time is set at 75 min. The optical, structural, and morphological properties of these thin films have been studied. The optical properties (mainly thickness, refractive index, absorption coefficient, and optical band gap) were investigated by optical transmittance measurements in the wavelength range of ultraviolet-visible-near infrared spectroscopy and spectroscopy infrared with Fourier transform. Fourier (FT-IR) and XRD analysis indicated that all sputtering ZnS films had a single-phase with a preferred orientation along the (111) plane of the zinc sphalerite phase (ZB). The crystallite size ranged from 11.5 to 48.5 nm with RF power getting a maximum of 200 W. UV–visible measurements exhibited that the ZnS film had more than 80% transmission in the visible wavelength region. In addition, it has been observed that the band gap energy of ZnS films is decreased slightly from 3.52 to 3.29 eV, and as the RF power is increased, the film thickness increases with the speed of deposit growth. Scanning electron microscopy observations revealed the types of smooth-surfaced films. The measurements (FT-IR) revealed at wave number 1118 and 465.02 cm?1 absorption bands corresponding to the symmetrical and asymmetric vibration of the Zn–S stretching mode. X-ray reflectometry measurements of ZnS films have shown that the density of the films is (3.9 g/cm3) close to that of solid ZnS.
关键词： RF-sputtering ZnS,ZnS buffer layer for solar cell,ZnS thin films by sputtered
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Hangzhou, China (2018.8.13-2018.8.17)] 2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Growth and Optical Properties of ZnSe Nanofilms Obtained from Modified Ammonia-free Chemical Bath Solution
摘要： ZnSe nano thin films were obtained with chemical bath deposition in an modified aqueous alkaline solution in which ammonia was eliminated complexing agent in our present work. The as-deposited films are transparent, specula reflective and homogenous. Energy-dispersive X-ray spectroscopy indicated that films were in near stiochiometric Zn:Se ratio. Measured by spectroscopic ellipsometry, thickness of 50~370nm film can be obtained, the ZnSe were in nano-films, morphology and the film formation process discussion indicated that the film grow through nano-cluster by nano-cluster deposition rather than ion by ion mechanism. Absorption of the annealed films in visible light area indicated that bandgap is around 2.8eV for the annealed ZnSe film obtained from modified ammonia free solutions, corresponding to the standard band gap for bulk ZnSe materials.
关键词： Growth Kinetics,ZnSe Films,Optical Properties,Chemical Bath solution
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Kiev (2018.4.24-2018.4.26)] 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Experimental Characterization of Graphene Thick Films
摘要： While the plasmonic nature of graphene at terahertz frequencies has been widely reported, investigations on the practical utility of graphene at the microwave frequencies are sparse. In this paper, an ink comprising graphene thick films of different concentrations (12.5 wt.%, 25 wt.% and 33 wt.%) is prepared for deposition, by screen printing. Detailed investigation of the surface morphology of the films using SEM and AFM reveals that the graphene films present a homogeneous dispersion of the filler with a comparatively lower surface roughness at higher concentrations, and negligible agglomerates. The films are then printed in between copper electrodes on FR-4 substrate, commonly used in RF circuits, and the measured scattering parameters analyzed.
关键词： screen printing,radio frequency (RF),graphene,thick films,surface morphology
更新于2025-09-23 15:23:52
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Physical and electrical properties of nitrogen-doped hydrogenated amorphous carbon films
摘要： Nitrogen-doped hydrogenated amorphous carbon films (a-C:H:N) have been prepared by a plasma-activated chemical vapor deposition technique (PACVD) by using a plasma beam source (PBS). The properties of the a-C:H:N films were changed by varying the total pressure, the substrate temperature (100 °C, 300 °C) and nitrogen partial pressure p(N2) by adding nitrogen to the precursor acetylene (C2H2). For the investigations, a-C:H:N films have been deposited onto glass slides and doped silicon wafers. The deposition rate decreased with increasing nitrogen content in the N2/C2H2 gas mixture and with decreasing total pressure. The elemental composition of two sample series (300 °C) has been analyzed with Elastic Recoil Detection Analysis (ERDA). The highest N content and N/C ratio was estimated to be 16 at.% and 0.25 at the highest p(N2), respectively. Microhardness measurements showed that the hardness decreased with increasing p(N2). Electrical resistance of the a-C:H:N films was measured by 4-point probe. Electrically conductive coatings have been obtained by nitrogen-doped a-C:H films at higher substrate temperature (300 °C). The electrical resistance of the a-C:H:N films also decreases with decreasing total pressure, with the lowest value being about 1 Ohm cm. The film density was determined by means of X-ray reflectometry (XRR).
关键词： PACVD,carbon nitride films,electrical conductivity,DLC,carbon films,XRR
更新于2025-09-23 15:22:29
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[IEEE 2018 IEEE 21st International Multi-Topic Conference (INMIC) - Karachi, Pakistan (2018.11.1-2018.11.2)] 2018 IEEE 21st International Multi-Topic Conference (INMIC) - Silica Nano-Particulate Coating Having Self-Cleaning and Antireflective Properties for PV Modules
摘要： In this research, silica nanoparticles are coated over the solar PV module glass to acquire super hydrophilic, antireflective and highly transparent surface. Silane precursor mixed with air sprayed on the substrate by aerosol deposition method. Pressure difference between the plasma chamber and the substrate is tuned by the introduction of helium gas, which results in good control over layer thickness and refractive indices. Due to the porous nature and graded index of coated film, the transmittance of glass substrate is increased from 91% to 99.2%. Surface topology of coated film is studied by AFM shows excellent antifogging and super-hydrophilic nature attributed to roughness and nano-porosity of coated film. Moreover, the super-hydrophilic nature endows these coatings with self-cleaning properties, which further enhances the overall efficiency of solar PV modules.
关键词： Antireflective coatings,Super-hydrophilic,Silica nanoparticles,Thin films,solar PV,Aerosol deposition,Nano-porous
更新于2025-09-23 15:22:29
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CuI Film Produced by Chemical Extraction Method in Different Media
摘要： CuI crystalline thin films were produced on substrates (commercial glass) using chemical extraction method in different chemical bath media. In this study, their structural, optical and electrical properties were analyzed. Transmittance, absorption, optical band gap and refractive index of the films were examined by UV/VIS spectrum. XRD data showed that the film has a hexagonal structure for CuI. Surface and elemental (in terms of ratio) analysis of the films were performed via SEM and EDX analysis. The highest average grain size of CuI was observed for the film produced in aqueous media whereas the lowest average grain size was seen in chloroform bath. The curve formed by the number of crystallites per unit area (N) is different than the curves of dislocation density and average grain size. Number of crystallites per unit area has reached its maximum value in CCl4 bath, but it has been decreased in chloroform bath. In addition, film thickness has varied between 1232 nm and 3624 nm according to the solvent of bath.
关键词： CuI films,Thin film,Chrystal growth,Optical properties
更新于2025-09-23 15:22:29
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Solution-processed amorphous gallium-tin oxide thin film for low-voltage, high-performance transistors; 溶液法制备低电压及高性能非晶GaSnO薄膜晶体管;
摘要： Gallium-tin oxide (GTO) semiconductor thin films were prepared by spin-coating with 2-methoxyethanol as the solvent. Their crystal structures, optical transparency, chemical states and surface morphologies, along with the electrical properties, were dependent on Ga contents and annealing temperatures. The optimized GTO channel layer was applied in the high-k Al2O3 thin film transistor (TFT) with a low operation voltage of 2 V, a maximum field-effect mobility of 69 cm2 V?1 s?1, a subthreshold swing (SS) of 76 mV dec?1, a threshold voltage of 0.67 V and an on-off current ratio of 1.8×107. The solution-processed amorphous-GTO-TFTs would promote the development of low-consumption, low-cost and high performance In-free TFT devices.
关键词： GTO semiconductor films,thin-film transistor,Al2O3 dielectric,stability
更新于2025-09-23 15:22:29
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Facile growth of novel morphology correlated Ag/Co-doped ZnO nanowire/flake-like composites for superior photoelectrochemical water splitting activity
摘要： In this paper, novel morphology correlation between silver nanowires (AgNWs) and cobalt (Co)-doped ZnO (Co-ZnO) flake-like thin films (nanowire/flake-like) has been proposed for enhanced photoelectrochemical (PEC) water splitting activity. Here in, high-quality AgNWs/Co-ZnO heterostructures enabled superior visible light water splitting activity compared to the pure ZnO and AgNWs/ZnO. To address the strategic effect of AgNWs coupling and transition metal (Co-2 at%) doping into the ZnO host lattice, we have carried out the X-ray diffraction, field emission scanning microscopy, X-ray photoelectron spectroscopy, UV–Vis transmittance, water contact angle and PEC analyses. In this way, PEC water splitting activity was mainly examined by linear sweep voltammetry (I-V), amperometric I-t and photoconversion efficiency (η) studies. The experimental results provide clear evidence of morphology correlation between AgNWs and Co-ZnO flake-like structures for strong visible light absorption. Specifically, AgNWs/Co-ZnO composites exhibited significant enhancement in the photocurrent density (7.0 × 10^-4 A/cm^2) than AgNWs/ZnO (3.2 × 10^-4 A/cm^2) and pure ZnO (1.5 × 10^-6 A/cm^2). As a result, detailed AgNWs/Co-ZnO geometry has great potential for photoconversion efficiency (0.73%). In a word, the merits of controllable AgNWs/Co-ZnO heterostructure are proposed to improve the visible light harvesting and charge carrier generation for energy conversion devices.
关键词： E. Electrodes,A. Films,D. ZnO,B. Composites,C. Optical properties
更新于2025-09-23 15:22:29
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Optoelectronic properties of transparent conducting silver beta alumina and indium doped silver beta alumina thin films prepared by multi source vacuum evaporation method
摘要： The present study reports the optoelectronic properties of crystalline transparent conducting silver beta alumina (AgAl11O17) and indium doped silver beta alumina (AgAl11O17:In) thin films. In contrast to the p-type conductivity of the delafossite AgAlO2, both the hexagonal crystalline AgAl11O17 and AgAl11O17:In are n-type as confirmed by hot probe, hall effect and thermoelectric measurements. The variation in electrical conductivity (10-5-10-2 S/cm) and activation energy are correlated with carrier concentration and mobility. The films exhibit a wide direct band gap of ~3.93 ±0.02eV and transparency upto~62%.
关键词： Transparent conducting oxides,Thin films,Electrical conductivity,Optical properties
更新于2025-09-23 15:22:29
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Design Guidelines for printable Magnetic Shielding Films for NFC Tags on
摘要： The performance of RFID tags deteriorates when mounted on metallic objects. This is due to the induced eddy current effect on the metal which produces a magnetic field that opposes the reader/ tag field. Suitable electromagnetic screening is needed to mitigate this issue e.g. ferromagnetic films shielding the tag from the metal. This paper explores some design guidelines for ferrite films properties for additive manufacturing methods. Simulated and measured results for different ferromagnetic films and their influence on the performance of the NFC tags are investigated.
关键词： NFC,additive manufacturing,ferromagnetic films,RFID
更新于2025-09-23 15:22:29