scholarly journals Study of structural, electrical, and optical properties of nickel-doped tin selenide crystals

2016 ◽  
Vol 94 (2) ◽  
pp. 212-217 ◽  
Author(s):  
G.K. Solanki ◽  
I.L. Chauhan ◽  
K.D. Patel
Keyword(s):  
Band Gap ◽  
Near Infrared ◽  
Visible Region ◽  
Hall Effect Measurement ◽  
Spectroscopic Technique ◽  
Optical Parameters ◽  
X Rays ◽  
X Ray Diffraction ◽  
Tin Selenide ◽  
Power Measurements

Nickel-doped tin selenide crystals can be grown using the direct vapour transport technique. This paper includes structural, electrical, and optical characterizations of SnSeNi0.2 crystals done by X-ray diffraction (XRD), energy-dispersive analysis of X-rays (EDAX), surface microstructure topography, Hall effect measurement carried out to determine type of material, Seebeck coefficient and calculation of power factor has been carried out from the data of thermoelectric power measurements and the ultraviolet–visible (UV-Vis) spectroscopic technique, respectively. The optical absorption spectrum was obtained in an UV-Vis–near-infrared (NIR) spectrometer in the range of 200–2500 nm. The UV-Vis spectroscopic technique has been used to calculate band gap, and the value of the band gap was found to be 0.84 eV in the visible region. Calculation of various optical parameters has been carried out.

scholarly journals Effect of thickness on the optical properties of Gaas thin films

2013 ◽  
Vol 37 (1) ◽  
pp. 83-91 ◽  
Author(s):  
Chitra Das ◽  
Jahanara Begum ◽  
Tahmina Begum ◽  
Shamima Choudhury
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Refractive Index ◽  
Band Gap ◽  
Optical Band Gap ◽  
Visible Region ◽  
Solar Spectrum ◽  
Band Gap Energy ◽  
Optical Parameters ◽  
Gap Energy

Effect of thickness on the optical and electrical properties of gallium arsenide (GaAs) thin films were studied. The films of different thicknesses were prepared by vacuum evaporation method (~10-4 Pa) on glass substrates at a substrate temperature of 323 K. The film thickness was measured in situ by a frequency shift of quartz crystal. The thicknesses were 250, 300 and 500 nm. Absorption spectrum of this thin film had been recorded using UV-VIS-NIR spectrophotometer in the photon wavelength range of 300 - 2500 nm. The values of some important optical parameters of the studied films (absorption coefficient, optical band gap energy and refractive index; extinction co-efficient and real and imaginary parts of dielectric constant) were determined using these spectra. Transmittance peak was observed in the visible region of the solar spectrum. Here transmittance showed better result when thicknesses were being increased. The optical band gap energy was decreased by the increase of thickness. The refractive index increased by increasing thickness while extinction co-efficient and real and imaginary part of dielectric constant decreased. DOI: http://dx.doi.org/10.3329/jbas.v37i1.15684 Journal of Bangladesh Academy of Sciences, Vol. 37, No. 1, 83-91, 2013

Tracking the changes in the structural, optical and photoluminescent properties of CuCo2O4/MnS nanocomposites with different composition ratios

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Zein K. Heiba ◽  
Mohamed Bakr Mohamed ◽  
Noura M. Farag ◽  
Ali Badawi
Keyword(s):  
Visible Region ◽  
Average Crystallite Size ◽  
Band Gaps ◽  
Optical Parameters ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optical Band Gaps ◽  
Refinement Method ◽  
Xrd Phase Analysis ◽  
Composition Ratios

Abstract (1−x)CuCo2O4/xMnS (x = 0, 0.25, 0.5) nanocomposite samples were formed using hydrothermal and thermolysis procedures. X-ray diffraction (XRD) phase analysis showed the formation of only CuCo2O4 phase necessitating the inclusion of Mn and S ions into the CuCo2O4 lattice. Fourier-transform infrared spectroscopy (FTIR) analyses confirmed the presence of Mn and S ions in the nanocomposite samples. Rietveld refinement method was applied to determine the cation distribution of the different ions between different sites. The cell parameter (a) has no fixed trend of change. The average crystallite size is almost the same for all samples with an average of 15 nm. The effect of insertion of Mn and S ions into the CuCo2O4 on the diffused absorbance, extinction coefficient, refractive index, dielectric properties, and nonlinear optical parameters was discussed in detail. The pristine CuCo2O4 nanoparticles have two direct optical band gaps (1.65, 2.74) eV which are decreased to (1.59, 2.56) and (1.58, 2.54) eV for the MnS content x = 0.25 and 0.5, respectively. The two indirect optical band gaps of pristine CuCo2O4 changed irregularly as the MnS amount increased in the nanocomposite. The PL spectrum of CuCo2O4 is shifted to higher wavelength in the visible region upon alloying with MnS. The photoluminescence (PL) intensity of the nanocomposite samples is smaller than that of CuCo2O4 sample. The emitted PL colors depended on the amount of Mn and S ions in the CuCo2O4 matrix.

Growth and Magneto-Optical Properties of CaTbAlO4 Crystal

2011 ◽  
Vol 306-307 ◽  
pp. 1722-1727 ◽  
Author(s):  
Man Mei ◽  
Li Li Cao ◽  
Yan He ◽  
Ru Ru Zhang ◽  
Fei Yun Guo ◽  
...  
Keyword(s):  
Optical Properties ◽  
Single Crystal ◽  
Room Temperature ◽  
Near Infrared ◽  
Visible Region ◽  
Czochralski Method ◽  
Optical Devices ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectral

The calcium terbium aluminate (CaTbAlO4) single crystal was grown by Czochralski method successfully for the first time.The structure of the crystal was determined by X-ray diffraction analysis.The transmission spectrum of the crystal was measured at room temperature at the wavelength of 400-1500nm.The specific Faraday rotation of the single crystal was surveyed at room temperature at the wavelength 532nm, 633nm, and 1064nm respectively.The Verdet constants of the CaTbAlO4 crystal are calculated and the results show that the Verdet constants of CaTbAlO4 are around 110% higher than that of TGG in the visible and near-infrared spectral region.Therefore,crystal CaTbAlO4 can be promising material for the fabrication of magneto-optical devices in the visible region.

3D Ln–Organic Frameworks Featuring Lantern-Shaped Dihelicate Chains: Synthesis and Magnetic and Photophysical Properties

2016 ◽  
Vol 69 (9) ◽  
pp. 1062 ◽  
Author(s):  
Shengyun Liao ◽  
Peiyao Du ◽  
Yanping Zhang ◽  
Xin Fu ◽  
Wen Gu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Hydrothermal Reaction ◽  
Photophysical Properties ◽  
Metal Organic Framework ◽  
Visible Region ◽  
Infrared Region ◽  
X Ray Diffraction ◽  
Topological Network ◽  
Metal Organic

The in situ hydrothermal reaction of rare earth nitrate (Ln(NO3)3), 5-(4-carboxyl-1H-1,2,3-triazol-1-yl) isophthalic acid (H3ctia), and (NH4)2C2O4 resulted in the formation of a series of 3D 4f coordination polymers ([Ln(tia)(C2O4)0.5(H2O)]) (Ln = Nd (1), Sm (2), Eu (3), Gd (4), Tb (5), Dy (6), and tia2– = 5-(1H-1,2,3-triazol-1-yl) isophthalate). The results of single crystal X-ray diffraction reveal that the dinuclear lantern sub-building units ([Ln2(CO2)4]2+) are linked by C2O42– to form dihelicate chains, which are connected by tia2– to afford a novel 3D metal–organic framework with an unordinary 3-nodal (2,3,8)-connected topological network with the Schläfli symbol of {4.62}2{42.616.89.10}{6}. Complexes 2, 3, 5, and 6 exhibit strong fluorescent emissions in the visible region and complexes 1, 2, and 6 show characteristic fluorescent emissions in the near-infrared region. In addition, the magnetic properties of complexes 4, 5, and 6 were also investigated.

Preparation and Characterization of Aluminium-Doped SnS Thin Films

2011 ◽  
Vol 418-420 ◽  
pp. 712-716 ◽  
Author(s):  
Shuai Zhang ◽  
Shu Ying Cheng ◽  
Hong Jie Jia ◽  
Hai Fang Zhou
Keyword(s):  
Doping Concentration ◽  
Near Infrared ◽  
Hall Effect Measurement ◽  
X Ray Diffraction ◽  
Al Doping ◽  
Glass Substrates ◽  
Direct Band ◽  
Evaporation Technique ◽  
Sns Thin Films ◽  
P Type

Metallic-doping chalcogenide compounds have attracted significant interest in application of photovoltaic devices recently. In this article, Al-doped SnS films with a thickness of about 500 nm have been deposited on glass substrates by thermal evaporation technique. Al-doping concentration (from 0 at. % to 15 at.%) in the SnS films can be controlled accurately by varying Al layer thickness. The effects of Al–doping on the physical properties of the films have been investigated by X-ray diffraction, scanning electron microscopy, ultraviolet-visible-near infrared spectroscopy measurements and Hall effect measurement system. All the films are orthorhombic SnS with preferred (111) crystallites orientation, and they are of p-type conductivity. With the increasing of Al-doping concentration, the evaluated direct band gap Edir of the SnS: Al films decreases from 1.50eV to 1.29eV and the conductivities of the films increase. Therefore, the optical and semiconducting properties of the SnS films have been improved by Al-doping.

Investigations on Tin Selenide Thin Film Based Schottky Barrier Diodes by I-V-T Method

2013 ◽  
Vol 665 ◽  
pp. 297-301
Author(s):  
Kiran Kumar Patel ◽  
K.D. Patel ◽  
Mayur Patel ◽  
Keyur S. Hingarajiya ◽  
V.M. Pathak
Keyword(s):  
Thin Film ◽  
Schottky Barrier ◽  
X Rays ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
Glass Substrates ◽  
Tin Selenide ◽  
Transmission Electron ◽  
Evaporation Technique ◽  
Selenide Thin Film

Tin Selenide thin films have been deposited using thermal evaporation technique on chemically and ultrasonically cleaned glass substrates. The stoichiometry of deposited films has been studied using Energy Dispersive Analysis of X-rays (EDAX).The orthorhombic structure and polycrystalline nature of the films were also revealed by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM) analysis. The well characterized thin film of SnSe was then used to fabricate Ag/p-SnSe/In Schottky barrier diode. The I-V characteristics of prepared diodes have been investigated over the temperature range of 303 K to 393 K. The forward biased I-V characteristics of prepared structure has been analyzed using TE theory and different device parameters have been evaluated and discussed in present paper. The Richardson constant was also determined from the conventional Richardson plot and it is found close to the reported value.

scholarly journals Nd3+ CONCENTRATION DEPENDENT OPTICAL FEATURES OF GADOLINIUM BOROPHOSPHO-TELLURITE GLASSES

2020 ◽  
Vol 1 (1) ◽  
pp. 1-10
Author(s):  
I. Bulus ◽  
J. K. Sheyin ◽  
E. Yayock ◽  
A. S. Dalhatu
Keyword(s):  
Solid State ◽  
Near Infrared ◽  
Great Influence ◽  
Rare Earth Ions ◽  
Optical Parameters ◽  
Tellurite Glasses ◽  
Solid State Lasers ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Host

Improving the optical response of glass host with two or more strong network formers via suitable controlled of rare earth ions is the key issue in the fabrication of optical based glass for solid state lasers and light emitting devices. Hence, we report the Nd3+ concentration dependent on optical parameters such as absorption edge, optical band gap (direct and indirect) and Urbach’s energy of gadolinium borophospho-tellurite glasses with chemical composition of 10Gd2O + 30B2O3 + 20P2O5 + (40-)TeO2 + Nd2O3 (where 0.0 ≤ x ≤ 1.0 mol%). The glass samples were synthesized by convectional melt quenching method and characterized through X-Ray Diffraction (XRD) and Ultraviolet Visible Near-Infrared (UV-Vis-NIR) measurements. The amorphous nature of these glasses was confirmed by X-Ray diffraction pattern while the UV-Vis-NIR spectra revealed six absorption peaks corresponding to the transition from ground level 4I9/2 to the various excited state of Nd3+ ions. It was found that the investigated range of Nd3+ doping concentrations has a great influence on aforementioned parameters. The excellent optical features established in the present glass host suggest their potentiality for solid-state lasers and other photonic applications. Bulus, I. | Department of Physics, School of Sciences, Kaduna State College of Education Gidan waya, Kafanchan, Nigeria

SUPERCRITICAL SOLVOTHERMAL SYNTHESIS AND NEAR-INFRARED ABSORBING PROPERTIES OF CsxWO3

2012 ◽  
Vol 05 (02) ◽  
pp. 1260001 ◽  
Author(s):  
CHONGSHEN GUO ◽  
SHU YIN ◽  
YUNFANG HUANG ◽  
QIANG DONG ◽  
HUIHUI LI ◽  
...  
Keyword(s):  
Near Infrared ◽  
Visible Region ◽  
Local Heat ◽  
Particle Size Analysis ◽  
Infrared Light ◽  
Size Analysis ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nir Light

Cs x WO 3 nanoparticles in the range of 20–50 nm have been successfully synthesized by the supercritical solvothermal approach, where after dissolving WCl6 and CsOH in a mixed solution of water, ethanol and oleic acid, the solution was heated at 300°C. The products were characterized by X-ray diffraction, TEM, HR-TEM, EDS, laser particle size analysis and thermographic measurements. Cs x WO 3 nanoparticles showed the high transparency in the visible region, excellent shielding performance of the near-infrared light and limited reflectance of light in the range of 200–2700 nm, indicating the strong absorption of NIR light on the nanosized Cs x WO 3. Cs x WO 3 nanoparticles also exhibited quick conversion of photo-energy to local heat.

scholarly journals Effect of L-asparagine as dopant on the growth and characteristics of ammonium tetroxalate dihydrate single crystal

2020 ◽  
Vol 38 (1) ◽  
pp. 48-61
Author(s):  
Eunice Jerusha ◽  
S. Shahil Kirupavathy
Keyword(s):  
Single Crystal ◽  
Band Gap ◽  
Optical Band Gap ◽  
Vickers Microhardness ◽  
Thermal Studies ◽  
Visible Region ◽  
Hysteresis Loops ◽  
Dielectric Behavior ◽  
X Ray Diffraction ◽  
Polarization Electric Field

AbstractSingle crystals of L-asparagine doped ammonium tetroxalate dihydrate were grown using slow evaporation solution growth technique with deionized water as a solvent. The shift and intensity of the peaks in the single crystal X-ray diffraction and Fourier transform infrared analyses confirmed the inclusion of L-asparagine in the ammonium tetroxalate dihydrate crystal structure. The optical transmission characteristics viz. optical band gap, optical conductivity, etc., were determined. Thermal studies revealed the occurrence of anomalies at 135.3 °C and 221.7 °C leading to the possibility of phase transitions and thereby, ferroelectric behavior. Vickers microhardness studies enabled determination of various microhardness parameters. Dielectric behavior was analyzed by varying the temperature and frequency. Anomalies were observed at 135 °C and 221 °C suggesting the existence of ferroelectric nature of the compound. Self-defocusing effect was observed. The polarization-electric field hysteresis loops showed a pinched effect due to defects induced by inclusion of dopant. The crystals were characterized by single crystal XRD, FT-IR, DRS, UV-Vis-NIR, Vickers microhardness test as well as thermal and dielectric techniques. In brief, L-asparagine as a dopant in ammonium tetroxalate dihydrate altered various physical properties of the crystals. They were highly transparent in the visible region with a wider optical band gap, softer material than the parent, higher phase transition temperature of 135 °C, negative nonlinearity and self-defocusing ability.

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