scholarly journals Effects of Annealing on the Structural and Optical Properties of V2O5 Thin Films Prepared by RF Sputtering for Humidity Sensor Application

2021 ◽  
pp. 3536-3544
Author(s):  
Bakr F. Hassan ◽  
Mohammed J. Dathan ◽  
Anas A. Abdallah
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Rf Sputtering ◽  
Rf Magnetron Sputtering ◽  
Xrd Analysis ◽  
Structural And Optical Properties ◽  
Glass Substrates ◽  
V2o5 Thin Films

     In this work, vanadium pentoxide (V2O5) thin films were prepared using rf magnetron sputtering on silicon wafer and glass substrates from V2O5 target at 200 °C substrate temperature, followed by annealing at 400 and 500 °C in air for 2 h. The prepared thin films were examined by X-ray diffraction (XRD), forier transform infra-red spectroscopy (FTIR), UV-visible absorbance, and direct current coductivity to study the effects of annealing temperature on their structural and optical properties. The XRD analysis exhibited that the annealing promoted the highly crystallized V2O5 phase that is highly orientated along the c direction. The crystalline size increased from 22.5 nm to 35.4 nm with increasing the annealing temperature to 500 °C. The FTIR spectroscopy showed the enhancement of the characteristics band for the V2O5 with increasing annealing temperature to 500 °C. The optical study showed that the energy gap for the sample deposited on glass slides decreased from 2.85 eV, for as deposited sample, to 2.6 eV upon annealing the sample to 500 °C. There was a linear dependence between sensitivity and relative humidity (RH) at the range from 25% to 70%, while the behavior was exponential  at high RH range.

Structural and Optical Properties of PbI2 Thin Films to Fabricate Perovskite Solar Cells

2020 ◽  
Vol 398 ◽  
pp. 140-146
Author(s):  
Kawther A. Khalaph ◽  
Zainab J. Shanan ◽  
Aqel Mashot Jafar ◽  
Falah Mustafa Al-Attar
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Perovskite Solar Cells ◽  
Lead Iodide ◽  
Structural And Optical Properties ◽  
Solar Cell Application ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force

Recently, lead iodide is the most materials employment in the perovskite solar cell application. This paper has studied the character of preparation, structural and optical properties of pbI2 materials. Structural properties are included investigation of the measurements X-Ray Diffraction (XRD), Scan Electron Microscopy (SEM), Fourier Transform InfraRed spectroscopy (FTIR) and Atomic Force Microscopy (AFM) tests to the PbI2 thin films samples. Optical properties are included the investigation UV-Vis test of the thin film samples deposited on glass substrates and investigated the Absorption, Transmittance and evaluated energy gap (Eg = 2.3 eV).

scholarly journals Effect of substrate temperature on structural and optical properties of cadmium sulfide thin films prepared by evaporation thermal deposition

2019 ◽  
Vol 30 (1) ◽  
pp. 205
Author(s):  
Nadheer Jassim Mohammed ◽  
Hassan A. Mahdi ◽  
Safaa F. Madlul ◽  
Adnan Kh. Hasan
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Substrate Temperature ◽  
Cadmium Sulfide ◽  
Wave Length ◽  
Xrd Analysis ◽  
Structural And Optical Properties ◽  
Thermal Deposition ◽  
Glass Substrates ◽  
Cds Thin Films

In this research , we study the effect of substrate temperature (423K and 473K) on structural and optical properties for thin films of cadmium sulfide (CdS) by evaporation thermal deposition method on glass substrates and the thickness was about (390nm).XRD analysis showed that CdS thin films prepared at (423K and 473K) are single crystal and have preferred orientation along (002).The grain size was found to be increased with increasing substrate temperature, in addition, the atomic force microscopy(AFM) an increase in root mean square (RMS) with an increase in substrate temperature. The absorbance and transmittance spectra have been recorded in the range off wave length(400-800nm), and it was found that the transmittance decreases with increasing substrate temperature, while the optical band gap decreases from (2.4-2.2ev)for allowed direct transition. CdS thin films should further investigated for application towards the fabrication of solar cells.

scholarly journals Study of the Influence of Annealing Temperature on the Structural and Optical Properties of ZnTe Prepared by Vacuum Thermal Evaporation Technique

2018 ◽  
Vol 31 (1) ◽  
pp. 50
Author(s):  
Sarmad M. Ali ◽  
Alia A.A. Shehab ◽  
Samir A. Maki
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force ◽  
High Smoothness ◽  
Evaporation Technique ◽  
20 Nm

   The ZnTe alloy was prepared as  deposited thin films on the glass substrates at a thickness of 400±20 nm using vacuum evaporation technique at pressure (1 × 10-5) mbar and room temperature. Then the thin films under vacuum (2 × 10-3 mbar) were annealing at (RT,100 and 300) °C for one hour. The structural properties were studied by using X-ray diffraction and AFM, the results show that the thin films had approached the single crystalline in the direction (111) as preferred orientation of the structure zinc-blende for cubic type, with small peaks of tellurium (Te) element for all prepared thin films. The calculated crystallite size (Cs) decreased with the increase in the annealing temperature, from (25) nm before the annealing to (21) nm after the annealing. The images of atomic force microscopy of all thin films appeared a homogenous structure and high smoothness through roughness values ​​that increased slightly from (1.4) nm to (3.4) nm. The optical properties of the ZnTe at (RT,100 and 300) °C were studied transmittance and absorbance spectrum as a function of the wavelength. The energy gap was found about (2.4) eV for the thin films before the annealing and increased slightly to (2.5) eV after annealing at 300 °C  

scholarly journals Temperature effect on structural and optical properties of V2O5 thin films prepared by spray pyrolysis technique

2020 ◽  
Vol 307 ◽  
pp. 01033
Author(s):  
Asmaa Mrigal ◽  
Lahocine El Gana ◽  
Mouhamed Addou ◽  
Khadija Bahedi ◽  
Rajae Temsamani ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Spray Pyrolysis Technique ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Glass Substrates ◽  
Optical Dielectric Constant

In this work, the effect of substrate temperature on structural and optical properties of V2O5 thin films has been characterized by X-ray diffraction (XRD); SEM and transmission. The films mince has been prepared by Reactive Chemical Spraying technology in Liquid Phase (RCSLP) on glass substrates preheated at (350, 400, 450 and 500 °C). The X-ray diffraction analysis confirms that all layers are polycrystalline, and the preferred orientation of V2O5 is the (001) plane. The morphology of V2O5 thin films are porous nature and their particle’s shape is three-dimensional. The transmittance and absorbance of thin film were measured from which the optical constants (Energy gap, Refractive index, Absorption coefficient, Extinction coefficient and Optical dielectric constant) were determined.

Effects of annealing temperature on the structural and optical properties of ZnO thin films prepared by sol–gel method

2016 ◽  
Vol 09 (06) ◽  
pp. 1750010 ◽  
Author(s):  
Jitao Li ◽  
Dinyu Yang ◽  
Xinghua Zhu ◽  
Hui Sun ◽  
Xiuying Gao ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Sol Gel ◽  
Heat Treating ◽  
Zno Thin Films ◽  
Structural And Optical Properties ◽  
Gel Method ◽  
Sol Gel Method

ZnO thin films have been prepared by sol–gel method in this paper. Zinc acetate, ethanol and mono-ethanolamine (MEA) were used as a metal precursor, solvent and stabilizer, respectively. The structural and optical properties of ZnO thin films were investigated and found to be strongly dependent on the annealing temperature. X-ray diffraction patterns revealed that as the annealing temperature increased, the crystalline quality of the samples became better. The atomic force microscope images of the samples show larger and compact grains at higher heat-treating temperature. The ultraviolet–visible transmittance spectra indicated that as the temperature increased, the transmittance improved and the energy gap became larger (from 3.11[Formula: see text]eV at 400[Formula: see text]C to 3.22[Formula: see text]eV at 500[Formula: see text]C). The photoluminescence spectra presented a variety of emission peaks, two strong peaks at 390[Formula: see text]nm and 469[Formula: see text]nm, respectively, from the intrinsic emission and point defects, and the intensity of these peaks decreased with the increase of temperature.

Investigation of Chelating Agents on Structural and Optical Properties of Mg(Zr0.05Ti0.95)O3 Thin Film on ITO/Glass Substrate

2013 ◽  
Vol 278-280 ◽  
pp. 393-396
Author(s):  
Ching Fang Tseng ◽  
Chih Wen Lee
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Chelating Agents ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Visible Region ◽  
Secondary Phase ◽  
Structural And Optical Properties ◽  
Glass Substrates ◽  
Ito Glass

Optical properties and microstructures of Mg(Zr0.05Ti0.95)O3 thin films prepared by sol-gel method on ITO/glass substrates at different amount of chelating agents and annealing temperatures have been investigated. The relative intensity ratio values of the peak Mg(Zr0.05Ti0.95)O3 thin films, secondary phase of MgTi2O5 and grain growth were depended on the amount of chelating agents and annealing temperature. In the optical transmission spectra, the Mg(Zr0.05Ti0.95)O3 thin films present high transparency (over 60%) in the visible region of the spectrum. The dependence of the optical properties and microstructure characteristics on thermal treatment was also investigated.

scholarly journals The effect of heat treatment on the optical properties of organic semiconductor (NiPc/C60) thin films

2019 ◽  
Vol 16 (39) ◽  
pp. 33-41
Author(s):  
Atheer M. Mkhaiber
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Optical Properties ◽  
Optical Absorption ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Optical Absorption Spectra ◽  
Optical Energy Gap ◽  
Optical Energy ◽  
Glass Substrates

Thin films of the blended solution of (NiPc/C60) on glass substrates were prepared by spin-coated method for three different ratios (100/1, 100/10 and 100/100). The effects of annealing temperature and C60 concentration on the optical properties of the samples were studied using the UV-Vis absorption spectroscopy and FTIR spectra. The optical absorption spectrum consists of two main bands, Q and B band, with maxima at about (602-632) nm and (700-730) nm for Q1 and Q2 respectively, and (340-375) nm for B band. The optical energy gap were determined from optical absorption spectra, The variation of optical energy gap with annealing temperature was nonsystematic and this may be due to the improvement in crystal structure for thin films. While the energy gap decreased by increasing the concentration of C60 approaches from the energy gap of this compound.

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