scholarly journals Optical Study on Deposed Polystyrene Doped DCM Laser Dye Thin Films at Different Temperature

2016 ◽  
Vol 68 ◽  
pp. 39-47
Author(s):  
Akeel Shaker Tuhaiwer
Keyword(s):  
Thin Films ◽  
Transition Energy ◽  
Energy Gap ◽  
Electronic Transitions ◽  
Effect Of Temperature ◽  
Optical Study ◽  
Laser Dye ◽  
Casting Method ◽  
Annealing Temperatures ◽  
Electronic Transition Energy

Polystyrene (PS) polymer doped with DCM laser dye thin films have prepared on glass substrate using casting method. The obtained PS doped with DCM thin films were treated at different annealing temperatures such (30, 40, 50, 60, 70) °C. It was observed from result that the allowed direct electronic transitions energy gap was increased from 2.21 up to 2.3e.V as the temperature increasing from 30-70°C. And the allowed indirect electronic transition energy gap rose from 0.06 to 0.15e.V as the temperature increasing. The allowed indirect phonon energy also was decreased at the same range of temperature. The different effect of temperature variation was observed on the optical properties of PS doped with DCM thin films.

scholarly journals "Synthesis and Optical Properties of Polystyrene Doped with DCM Thin Films "

2018 ◽  
Vol 5 (1) ◽  
pp. 8-18
Author(s):  
Akeel Shaker Tuhaiwer
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Transition Energy ◽  
Energy Gap ◽  
Electronic Transitions ◽  
Effect Of Temperature ◽  
Casting Method ◽  
Double Beam ◽  
Urbach’S Energy ◽  
Electronic Transition Energy

"In the present work Polystyrene (PS) polymer doped with DCM laser dye thin films have been prepared on glass substrate using casting method. The final samples of PS doped with DCM thin films were treated with different annealing temperatures at (30, 40, 50, 60) oC. Optical absorption and transmission spectra of the prepared thin films were recorded using UV-VIS double beam spectrometer in the wavelength range from 190 to 1100 nm. The results shown that the allowed direct electronic transitions energy gap increased from 2.08 up to 2.25e.V as the temperature increasing from 30 to 60oC, whereas the allowed indirect electronic transition energy gap increase from 2.02 up to 2.17 eV as the temperature increase from 30 to 60oC. The effect of temperature on the optical properties such as Urbach’s energy, Refractive index, Extinction coefficient, Critical angle, Brewster angle, and Finesse coefficient of PS doped with DCM thin films also studied in this work.

scholarly journals The Effects of Additive TiO2 Nanoparticles on the Energy Gap of DCM Doped with PS Thin Films

2016 ◽  
Vol 68 ◽  
pp. 71-81
Author(s):  
Jafer Fahdel Odah
Keyword(s):  
Thin Films ◽  
Energy Gap ◽  
Sol Gel ◽  
Casting Method ◽  
Characteristic Peak ◽  
Co Doping ◽  
Energy Gaps ◽  
Gel Technique ◽  
Doped Polymer ◽  
Electronic Transition Energy

In this work thin films containing laser dye (DCM) doped with polystyrene (PS) were prepared using casting method. Titania (TiO2) nanoparticles also were synthesized using sol gel technique. Characteristics of the tetania were done using XRD patter, and the characteristic peak of anatase is sharper and clear to observe, in particular at 25.40° degree. While scanning electron microscopy (SEM) was used to achieve the morphology of TiO2samples, and to determine the sizes of nanoparticles. Different titania nanoparticle densities (0.882×1020, 1.765×1020, 2.648×1020, 3.530×1020and 4.413×1020cm-3) were co-doping with dye doped polymer and study the effect of this addition on the optical properties and electronic transition energy gaps in cases of both direct and indirect transitions.

scholarly journals "The Effects of Additive TiO2 Nanoparticles on the Optical properties of DCM Doped with PVC Thin Films "

2018 ◽  
Vol 5 (1) ◽  
pp. 27-35
Author(s):  
Shymaa K. Hussian ◽  
Thill A. Kadhum Al-musaw ◽  
Shatha Raheem Helal Al himidi
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Tio2 Nanoparticles ◽  
Electronic Transition ◽  
Transition Energy ◽  
Energy Gap ◽  
Sol Gel ◽  
Titania Nanoparticles ◽  
Absorption Region ◽  
Electronic Transition Energy

"In this work thin films containing laser dye (DCM) doped with (PVC) were prepared using casting method. Titania (TiO2) nanoparticles also were synthesized using sol-gel technique. Different titania nanoparticle densities (0.882×1020, 1.765×1020, 2.648×1020 and 3.530×1020 cm-3) were co-doping with dye doped polymer to study the effect of this addition on the optical properties and electronic transition energy gaps in cases of both direct and indirect transitions, Absorbance spectra were measured using Spectrophotometer. Absorption and extinction coefficients as well as the refractive indices have been obtained the spectra of absorbance at the strong absorption region. It was observed from results that the allowed direct electronic transitions energy gap was decreasing from 2.22 to 2.175e.V with the increasing of titania nanoparticles density and the allowed indirect electronic transition energy gap decreasing from 2.19 to 2.13e.V.

scholarly journals ZnO Characterization of ZnO/GaAs heterojunction

2019 ◽  
Vol 17 (43) ◽  
pp. 58-66
Author(s):  
Eman M. Nasir
Keyword(s):  
Thin Films ◽  
Solar Cell ◽  
Energy Gap ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Band Gap Energy ◽  
Open Circuit ◽  
Zno Thin Films ◽  
Pulse Laser Deposition Technique ◽  
Annealing Temperatures

ZnO thin films have been prepared by pulse laser deposition technique at room temperatures (RT). These films were deposited on GaAs substrate to form the ZnO/GaAs heterojunction solar cell. The effect of annealing temperatures at ( RT,100, 200)K on structural and optical properties of ZnO thin films has been investigated. The X-ray diffraction analysis indicated that all films have hexagonal polycrystalline structure. AFM shows that the grains uniformly distributed with homogeneous structure. The optical absorption spectra showed that all films have direct energy gap. The band gap energy of these films decreased with increasing annealing temperatures.  From the electrical properties, the carriers have n-type conductivity.  From C-V measurement of ZnO/GaAs heterojunciton solar cell at frequency 100, 200 KHz, It is found that built–in potential (Vbi) increases with increase frequency. Also, from I-V characteristic it is observed that the ideality factor is 2.7. Short-circuit current (Isc) is 4.0mA/cm2, open circuit voltage (Voc) is 0.5V, fill factor ( F.F) is 0.7  and the efficiency is about 6.0 %.

Studying the Optical Properties of Thin Films Prepared from Polystyrene Doped with DCM Dye

2015 ◽  
Vol 61 ◽  
pp. 178-183 ◽  
Author(s):  
Ahmed Namah Mohamed
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Phonon Energy ◽  
Casting Method ◽  
Polymeric Thin Films ◽  
Double Beam ◽  
Direct Energy ◽  
Direct Energy Gap

Polymeric thin films of Polystyrene (PS) doped with DCM laser dye have been prepared using casting method and pure thin films of PS. Optical properties for deposed thin films on glass substrate with 0.237μm was prepared using casting method involved absorptions spectra measurement using UV mate SP-8001 double-beam spectrophotometer covering the wavelengths range 190-1100nm, where the absorption coefficient was calculated and the direct energy gap was 3.9eV for PS thin film, energy gap for PS-DCM thin film was 2.2eV. While for indirect transitions the energy gap for PS thin film was 2.25eV and phonon energy was 0.55eV, but the energy gap for PS-DCM film was 1.4eV and phonon energy was 0.5eV.

scholarly journals Effect of substrate temperature on structural and optical properties of spray deposited ZnO thin films

2015 ◽  
Vol 33 (3) ◽  
pp. 491-496 ◽  
Author(s):  
Y. Larbah ◽  
M. Adnane ◽  
T. Sahraoui
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Energy Gap ◽  
Zno Thin Films ◽  
Effect Of Temperature ◽  
Zno Films ◽  
Spray Pyrolysis Method ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Substrate Temperatures

Abstract Undoped ZnO thin films have been prepared on glass substrates at different substrate temperatures by spray pyrolysis method. The effect of temperature on the structural, morphological and optical properties of n-type ZnO films was studied. The X-ray diffraction (XRD) results confirmed that the ZnO thin films were polycrystalline with wurtzite structure. Scanning electron microscopy (SEM) measurements showed that the surface morphology of the films changed with temperature. The studies demonstrated that the ZnO film had a transmission of about 85 % and energy gap of 3.28 eV at 450 °C. The RBS measurements revealed that ZnO layers with a thickness up to 200 nm had a good stoichiometry.

scholarly journals Impact of PS/PMMA Polymer Ratios with Nanocomposite Material on Optical and Morphological Properties

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Adawiya J.Haider ◽  
Zeyad Al-Shibaany ◽  
Ryiam Hawy ◽  
Niheda Hamed
Keyword(s):  
Rhodamine 6G ◽  
Energy Gap ◽  
Nanocomposite Materials ◽  
Nanocomposite Material ◽  
Morphological Properties ◽  
Laser Dye ◽  
Visible Spectroscopy ◽  
Casting Method ◽  
Uv Visible ◽  
Pmma Polymer

In this work, nanocomposite material consisting of titanium dioxide (TiO2) nanoparticles and rhodamine 6G (R6G) laser dye was doped with different ratios of polystyrene (PS) and polymethylmethacrylate (PMMA) polymer blends (i.e. 40% PS/60% PMMA and 50% PS/50% PMMA) using the casting method. The optical properties of the prepared samples were measured using UV-visible spectroscopy. These measurements include the calculations of the absorption (A%), absorption coefficient (α), energy gap (Eg), refractive index (n), extinction coefficient (K) and real and imaginary parts. These nanocomposite materials were investigated using a scanning electron microscope and photoluminescence (PL) spectra emission. The SEM results show that the optimum results were at 50% PS/50% PMMA/TiO2/R6G with all the dye being decorated in the process blend, while the TiO2 nanoparticle demonstrated that the pores were incomplete in some places and complete in others. The optical results show that there are red shifts in all absorption peaks caused by the increased PS ratio. The Eg decreased from 3.2 eV to 2.8 eV as the concentration of PS in the polymer matrix increased. The PL spectrum for the nanocomposites, with a different ratio of PS, shows that sharp peaks of PL emission occur at a wavelength of 570 nm and shift towards longer wavelengths with an increased PS%.

scholarly journals INFLUENCE OF ANNEALING TEMPERATURE ON THE STRUCTURAL AND OPTICAL PROPERTIES OF COPPER IODIDE THIN FILMS

2021 ◽  
Vol 03 (02) ◽  
pp. 100-108
Author(s):  
Zuheer. N MAJEED ◽  
Nadia Naeema DAHAHER ◽  
Ebtisam K ALWAN
Keyword(s):  
Thin Films ◽  
Annealing Temperature ◽  
Energy Gap ◽  
Target Surface ◽  
Optical Measurements ◽  
Cubic Phase ◽  
Copper Iodide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Annealing Temperatures

Copper Iodide (CuI) nanoparticles with (250 nm) thickness have been prepared at RT on glass substrate using PLD technique with focused Nd:YAG laser beam at (800 mJ) with a frequency second radiation at (1064 nm) (pulse width 9 ns) repetition frequency (6 Hz), for 500 laser pulses incident on the target surface . The films annealed to different annealing temperatures (423K )and(523K). The structural and surface morphology properties of the deposited CuI thin films were examined by X-ray diffraction analysis (XRD) and Atomic force microscope (AFM). The X-ray diffraction show that structure is a cubic phase with (111) plane preferential orientation direction. AFM was used to examine and measure the morphology and average diameter for CuI thin films respectively. It is observed that the average nanoparticles size increases with increasing of annealing temperature. The optical measurements showed that CuI thin films have direct allowed energy gap transition and the energy gap (Eg) decreases from (3.2eV) to (2.8 eV) with increasing annealing temperatures from RT to (532 K) for all samples.

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