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Wyświetlanie 1-15 z 24
Tytuł:
Structural and optical properties of nanocrystalline CdS films prepared by spray pyrolysis
Autorzy:
Aljarrah, Radhyah M. S.
Aljobory, Adnan H.
Powiązania:
https://bibliotekanauki.pl/articles/1179009.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cadmium Sulphide
CdS films
spray pyrolysis
Opis:
Cadmium Sulphide (CdS) thin films are produced using spray pyrolysis deposition technique. Films are annealed in air at 400, 500, and 600 K of 1 h. It characterized by X-Ray Diffraction (XRD), Atomic Force Microscope (AFM) and optical properties of CdS. XRD shows that these films are polycrystalline in nature with cubic and hexagonal crystalline structure. The crystallite size, microstrain, and dislocation density were measured. AFM shows that the total substrate surface is finely covered with uniformly distributed spherical shaped grains. Optical transmittance was shown that direct transition with band gap energy was decreased between 2.44 to 2.27 eV with annealing.
Źródło:
World Scientific News; 2017, 87; 175-190
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of deposition parameters on kinematics growth and optical properties of PbS nano films deposited by chemical bath deposition
Autorzy:
Mousa, A. M.
Hassen, S. M.
Mohmoed, S.
Powiązania:
https://bibliotekanauki.pl/articles/412201.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
nanofilm
chemical bath deposition
PbS films
Opis:
The paper presents a study regarding the kinetic of chemical bath deposition (CBD) PbS nano films. Nano films were deposited from chemical bath containing thiourea, lead nitrite, and ammonia. The deposition kinematics and optical investigations have been performed to compare the properties of the films grown with different precursor solutions. We are able to determine the growth rate as a function of the synthesis conditions and it was found that the growth rate of deposited nano layer affected significantly by synthesis conditions. The main characteristic of nano films is the band gap. This parameter determined from spectroscopy Measurements of transmission, in the energy range of 240-840 nm is influenced by many factors such as deposition time, bath temperature, pH value of the path and molar concentration of the reactants.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 15; 1-10
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties of Polyvinyl Chloride Doped with DCM dye Thin Films
Autorzy:
Mohamed, Ahmed Namah
Tuhaiwer, Akeel Shaker
Razzaq, Zaid Saud
Powiązania:
https://bibliotekanauki.pl/articles/1192703.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
DCM
optical properties
polyvinyl chloride
thin films
Opis:
Optical properties such as absorption coefficients, refractive indices, and extinction coefficients of pure polyvinyl-chloride (PVC) and DCM laser dye doped with PVC thin films where prepared using casting method have been determined in the range between 190-1100nm. Measurement have been performed in pure and doped (PVC). The direct electronic transition and indirect energy gaps were calculated using the behaver of absorption coefficient with wavelength. The direct energy gap was 3.9e.V for pure PVC and 2e.V for doped PVC, but indirect energy gap was 2.4e.V for pure PVC and 1.1e.V for doped. The phonon energy was 1.05e.V for pure PVC and was 0.55e.V for DCM doped with PVC thin film.
Źródło:
World Scientific News; 2016, 30; 45-56
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of the etching time and current density on Capacitance-Voltage characteristics of P-type of porous silicon
Autorzy:
Hadi, Hasan A.
Abood, Tareq H.
Mohi, Ali T.
Karim, Mahmood S.
Powiązania:
https://bibliotekanauki.pl/articles/1178661.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
electrochemical etching
heterojunction
porous silicon
thin films
Opis:
In This paper, electrochemical etching teqniques was using to formation of nano crystalline porous silicon layer on p-type Si substrates. Measurement of capacitance – voltage characteristics at various etching time and current densities were used for calculated built in voltage and type of heterojunction. The built in voltage values were decreased with increasing etching time and current densities for both anisotype Al/PS/p-Si/Al heterojunction. These characteristics are interpreted by assuming the abrupt heterojunction model. The effect of different etching time and current densities on electrical properties of PS have been investigated.
Źródło:
World Scientific News; 2017, 67, 2; 149-160
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and Optical Properties of Chemically Deposited CdS Thin Films
Autorzy:
Mohammed, R. Y.
Abduol, S.
Mousa, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/412111.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cadmium sulfide films
chemical bath deposition
XRD
Opis:
Polycrystalline Cadmium sulfide (CdS) films were deposited onto Corning glass substrates from alkaline solutions containing CdCl2, KOH, Na3C6H5O7 and CS(NH2)2 at different deposition times (10, 20, 30, 40 and 50 min), bath temperatures (80 ±2 °C) and different concentration of the reactants. A comparative study was performed out on thin film via optical transmission and X-ray diffraction (XRD) measurements. The results which reveal that the deposition time has a profound influence on the growth rate and band gap of the deposited layers. Diffraction data was used to evaluate the lattice parameter, grain size, average strain, number of crystallites per unit area and dislocation density in the film are calculated.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 10; 91-104
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between Optical and Structural Properties of Chemically deposited CdS Thin Films
Autorzy:
Mohammed, R. Y.
Abduol, S.
Mousa, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/411521.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
cadmium sulfide
chemical bath deposition
CdS films
XRD
Opis:
Polycrystalline Cadmium sulfide (CdS) films were deposited onto Corning glass substrates from alkaline solutions containing CdCl2, KOH, Na3C6H5O7 and CS(NH2)2 at different deposition times (10, 20, 30, 40 and 50 min), different bath temperatures and different concentration of the reactants. A comparative study was performed out on thin film via optical transmission and X-ray diffraction (XRD) measurements which reveal that the deposition time has a profound influence on the growth rate and band gap of the deposited layers. Diffraction data are used to evaluate the lattice parameter, grain size, average strain, number of crystallites per unit area and dislocation density in the film are calculated.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 11, 2; 146-158
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and optical properties of nanostructured bismuth oxide
Autorzy:
Ali, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/412556.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
thin films’ bismuth oxide
optical properties
structural properties
Opis:
Thin films of bismuth oxide have been prepared utilizing vacuum evaporation. XRD anyalysis reveal that all the films were tetragonal polycrystalline structure with a preferred orientation along (002) plane. SEM images indicate that the grain size fall in the category of nanosize. AFM results assure that the nanonstructure behavior of thin films. Optical studies show that these films have a direct transition with optical energy gap equal to 2.5 eV.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 15; 64-72
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of annealing temperature on the structural and optical properties of CdSe: 1% Ag thin films
Autorzy:
Shehab, Alia A. A.
Mustafa, Mohammad H.
Majeed, Samir G.
Powiązania:
https://bibliotekanauki.pl/articles/1192119.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
annealing
XRD
Optical
CdSe: 1% Ag
thin films
Opis:
CdSe: 1% Ag thin films prepared by thermal evaporation method on glass substrates under vacuum technique with rate of deposition equal to 50 nm/min, the deposited films thickness (1µm) on glass substrates have been annealed at different temperatures for one hour. XRD measurement shows that the films have polycrystalline structure at R.T and change to single crystalline when annealed these films for different annealing temperatures (423, 473, 523 K). The optical measurement indicated that CdSe: 1% Ag films have direct optical energy gap, and it decreases with increasing annealing temperatures. The optical constant refractive index, extinction coefficient and dielectric constants were also studied.
Źródło:
World Scientific News; 2016, 45, 2; 185-195
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of deposition temperature on nanocrystalline CdS thin films: Application in Solar Cells as Antireflection Coatings
Autorzy:
Patil, S. M.
Pawar, P. H.
Powiązania:
https://bibliotekanauki.pl/articles/412049.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdS thin films
XRD
SEM
TEP and electrical conductivity
Opis:
Nanocrystalline CdS thin films were successfully prepared using simple chemical bath deposition technique. Cadmium sulphate, thiourea and deionised water were used as starting precursor solution. The prepared thin films were characterized using X-ray diffractogram (XRD), Scanning electron microscope (SEM), elemental composition using energy dispersive spectrophotometer (EDAX) and optical band gap (UV-Spectroscopy).X-ray diffractogram reveals that present of cubic and hexagonal phase. The thickness, crystallite size and grain size were observed to be increase with increase operating temperature of bath while optical band gap energy slightly decreases. Effect of deposition temperature on physical, structural, microstructural, electrical and optical properties of these films was studied and presented in the present investigation. Prepared thin films shows good response towards photoconducting in presence and absent of light.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 1; 21-36
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Gamma Irradiation on the Optical Properties of Mg doped CdO Thin films deposited by Spray Pyrolysis
Autorzy:
Hassouni, M.H.
Mishjil, K.A.
Chiad, S.S.
Habubi, N.F.
Powiązania:
https://bibliotekanauki.pl/articles/412503.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
TCOs
thin films
optical properties
doping film
gamma radiation
Opis:
Thin films of CdO and 9 % Mg doped CdO doped have been prepared using spray pyrolysis technique. Transmission and absorption spectra were recorded in order to estimate these films. The deposited thin films were exposed to γ - rays. We have studied the transmission, absorptions and absorption coefficient as a function of photon energy before and after irradiation. The optical constants such as: reflectance, extinction coefficient, refractive index, real and imaginary parts of the dielectric constant and the electrical conductivity were calculated also.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 11; 26-37
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Optical and Surface Morphology Properties of AgInTe2
Autorzy:
Khudayer, Iman H.
Abaas, Marwan R.
Powiązania:
https://bibliotekanauki.pl/articles/1177914.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
AgInTe2 thin films
Optical properties
Thermal evaporation
transmission
Opis:
AgInTe2 (AIT) thin films prepared by using vacuum thermal evaporation technique, of thickness 150 nm, with deposition rate 1.8±0.2 nm/sec on glass of substrate with pressure (10-5) mbar and at room temperature. In the range 473-673 K all samples has been heat treatment. The AIT properties of optical thin films would been studied like (coefficient of absorption, index of refractive, coefficient of extinction, real and imaginary dielectric constant) by using Measurement spectra of absorption and transmission. Results of the optical constants showed that it is wide applications as an photovoltaic applications and optoelectronic devices.
Źródło:
World Scientific News; 2018, 97; 99-112
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect Cd Doping on the Structural and Optical Properties of ZnO Thin Films
Autorzy:
Najim, J. A.
Rozaiq, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/412167.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ZnO thin films
semiconductor doping
optical properties
structure properties
Opis:
ZnO thin films with Cd/Zn nominal ratios of 0 %, 1 %, 3 %, 5 %, and 7 % and thickness of 0.7 μm were prepared by chemical spray pyrolysis. X-ray diffraction patterns showed that the films have polycrystalline structures and peaks matching the hexagonal ZnO structure. Crystallite sizes ranged from about 35 nm to 87 nm. As the doping concentration increased, full width at half maximum values decreased and crystallite sizes increased. The UV-Vis spectra of the ZnO:Cd films showed high transparency in the visible region. The optical band gap of the ZnO:Cd films decreased from 3.255 eV to 3.17 eV with increasing Cd doping concentration. The transition type was direct, thereby allowing transition. The ZnO:Cd thin films were annealed at 400 °C, and annealing treatment showed improvements in the properties of the derived films.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 2; 137-150
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocrystalline hexagonal shaped CdS thin films for photoconducting application
Autorzy:
Patil, S. M.
Pawar, P.H.
Powiązania:
https://bibliotekanauki.pl/articles/412642.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
nanocrystalline CdS
thin films
chemical bath deposition
analytical technique
photoconductivity
Opis:
Nanocrystalline thin films of cadmium sulphide were prepared by chemical bath deposition technique onto glass substrate at 60 °C. The deposition parameters were optimized to obtain good quality of nanocrystalline thin films such as, time, precursor concentration, temperature of deposition and pH of the solution. The studies on crystal structure, composition, surface morphology, electrical conductivity and photoconductivity of the films were carried out by using different analytical technique. Characterization includes X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray analysis (EDAX), Electrical and photoconductivity. The response and recovery time of the thin film were measured and presented.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 2; 153-167
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Substrate Temperature Effects on the Nanostructural and Optical Parameters of CdO Thin Films
Autorzy:
Habubi, Nadir F.
Jadduaa, Muneer H.
Harbi, Zainab Ali
Powiązania:
https://bibliotekanauki.pl/articles/1193957.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CdO thin films
chemical spray pryrolysis
optical parameters
structural parameters
Opis:
CdO thin films were prepared by the chemical spray pyrolysis technique under different glass substrate temperature (300, 350, 400, 450 and 500 °C). XRD anaylsis confirms the cubic polycrystalline nature of the deposited thin films with a preferred orientation along (111) plane. The average crystallite size suggests the formation of nanostructure of the deposited films. The average particle size obtained by AFM assure the existence of nanostructure. The values of the energy gap obtained from the derivative of absorbance with respect to the incident photon energy were found to increase from 2.610 nm to 2.666 nm as the substrate temperature increase.the values of refractive index and extinction coefficient were decreased by the increasing substrate temperature.
Źródło:
World Scientific News; 2015, 18; 19-34
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of molarity on the structural and optical properties of ZnO thin films deposit by CSP
Autorzy:
Habubi, Nadir F.
Abood, Ziad M.
Algamel, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/1193915.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Urbach energy
ZnO
ZnO thin films
optical properties
structural properties
Opis:
ZnO thin films have been prepared by chemical spray pyrolysis technique CSP). XRD pattern reveals that the preferred orientation was varied with concentration, topography analysis was done by AFM micrograph which confirm the existence of nonstructural films. The optical properties was done by recorded the transmittane and absorbance which were affected by an increase in concentration. The values of optical energy gap obtained from Tauc relation were 3.17, 3.18 and 3.19 eV for 0.05, 0.1 and 0.5 M respectively. Urbach energy confirms the decrease in band tail as the concentration increase.
Źródło:
World Scientific News; 2015, 22; 55-69
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 24

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