Photoconductivity of Nanocomposite MEH-PPV: TiO2 Thin Films

2011 ◽  
Vol 13 ◽  
pp. 87-92 ◽  
Author(s):  
M.S.P Sarah ◽  
F.S. Zahid ◽  
M.Z. Musa ◽  
U.M. Noor ◽  
Z. Shaameri ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Surface Morphology ◽  
Spin Coating ◽  
Glass Substrate ◽  
Spin Coating Technique ◽  
Coating Technique ◽  
Current Voltage ◽  
Current Voltage Characteristics

The photoconductivity of a nanocomposite MEH-PPV:TiO2 thin film is investigated. The nanocomposite MEH-PPV:TiO2 thin film was deposited on a glass substrate by spin coating technique. The composition of the TiO2 powder was varied from 5 wt% to 20 wt% (with 5 wt% interval). The concentration of the MEH-PPV is given by 1 mg/1 ml. The current voltage characteristics were measured in dark and under illumination. The photoconductivity showed increment in value as the composition of the TiO2 is raised in the polymer based solution. The absorption showed augmentation as the amount of TiO2 is increased. The escalation of the current voltage is then supported by the results of surface morphology.

The Influence of Mn/Ga Solution Mole Fraction on the Solid Composition and Microstructure of GaN:Mn Thin Film Deposited on Silicon Substrate by Spin Coating Technique

2014 ◽  
Vol 896 ◽  
pp. 203-210
Author(s):  
Heri Sutanto ◽  
Iis Nurhasanah ◽  
Istadi Istadi ◽  
Priyono
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Mole Fraction ◽  
Spin Coating ◽  
Lattice Parameter ◽  
Nitrogen Vacancy ◽  
Spin Coating Technique ◽  
Carbon Impurity ◽  
X Ray ◽  
Coating Technique

The influence of Mn/Ga solution on the characteristics of solid composition and microstructure of GaN:Mn thin film was studied. GaN:Mn thin films were deposited on Si (111) substrate by the Chemical Solution Deposition (CSD) method using the spin coating technique. Variations of the Mn/Ga mole fraction were 4%, 6%, 8%, and 10% respectively. The GaN:Mn thin films were then heated at a temperature of 900°C for 2 hours in an N2environment with a constant flow rate of 120 sccm. Atomic composition, crystal structure, and surface morphology of GaN:Mn thin films were characterized using X-Ray Diffraction (XRD), Energy Dispersive of X-ray (EDX), and Scanning Electron Microscope (SEM). EDX results showed that the larger the Mn/Ga mole fraction solution, the higher the Mn At percentage is. The correlation of At Mn percentage and Mn/Ga solution mole fraction is represented by the formula y = 0.023x3- 0.352x2- 1.742x -2.81. All of the GaN:Mn thin films still have nitrogen vacancy, carbon impurity and maintain the wurtzite polycrystalline structure. Lattice parametera, which is in the range of 3.2077Å – 3.2621Å, and lattice parameterc,which is in the range of 5.1094Å – 5.3038Å, depend on Mn atomic percentage of the film. The Root Mean Square (RMS) of GaN:Mn thin film surface roughness is in the range of 15.3nm – 29.90nm. The grain size for the 6% Mn/Ga mole fraction thin film is homogeneous.

The effect of organic solvents on the optical and morphological properties of metallophthalocyanines containing 3,5-bis(2′,3′,4′,5′,6′-pentafluorobenzyloxy)benzyloxy groups

2019 ◽  
Vol 23 (01n02) ◽  
pp. 136-141 ◽  
Author(s):  
Mukaddes Özçeşmeci ◽  
İdris Sorar ◽  
Esin Hamuryudan
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Surface Morphology ◽  
Organic Solvent ◽  
Organic Solvents ◽  
Spin Coating ◽  
Spin Coating Technique ◽  
Morphological Properties ◽  
Metal Phthalocyanines ◽  
Coating Technique

Thin films of metal phthalocyanines (M: Co, Zn, Ni) substituted with four 3,5-bis(2[Formula: see text],3[Formula: see text],4[Formula: see text],5[Formula: see text],6[Formula: see text]-pentafluorobenzyloxy)benzyloxy groups have been prepared by the spin-coating technique. Optical properties and surface morphology of the thin films of metallophthalocyanines have been investigated as a function of organic solvents of acetone, chloroform, tetrahydrofuran, dimethylformamide and dimethylsulfoxide. Results show that optical properties and surface morphology of the prepared films depend on the type of organic solvent used.

Electrical Property of Transparent Thin Films TiO2 and Sr-Doped TiO2 Developed by Spin Coating

2013 ◽  
Vol 665 ◽  
pp. 263-266
Author(s):  
M.H. Mangrola ◽  
A.S. Pillai ◽  
B.H. Parmar ◽  
V.G. Joshi
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electrical Property ◽  
Spin Coating ◽  
Glass Substrate ◽  
High Frequency ◽  
Ac Conductivity ◽  
Room Temperature ◽  
Coating Technique ◽  
Increase With Increase

Transparent thin film of pure TiO2and 3% Sr-doped TiO2(Ti0.97Sr0.03O2) were prepared by spin coating technique onto well-cleaned glass substrate. The dielectric behaviour of the films were studied at room temperature for different frequencies. The capacitance of both films were is found to decrease with increasing frequency and at higher frequencies capacitance becomes constant. AC conductivity is found to continuously increase with increase in the frequency. At high frequency it doesnt show any change and remains almost constant.

scholarly journals Effect of iron doping on structural and optical properties of TiO2 thin film by sol–gel routed spin coating technique

2017 ◽  
Vol 07 (04) ◽  
pp. 1750024 ◽  
Author(s):  
Stephen Lourduraj ◽  
Rayar Victor Williams
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Sol Gel ◽  
Visible Region ◽  
Spin Coating Technique ◽  
Optical Measurements ◽  
Structural And Optical Properties ◽  
Coating Technique

Thin films of iron (Fe)-doped titanium dioxide (Fe:TiO[Formula: see text] were prepared by sol–gel spin coating technique and further calcined at 450[Formula: see text]C. The structural and optical properties of Fe-doped TiO2 thin films were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet–visible spectroscopy (UV–vis) and atomic force microscopic (AFM) techniques. The XRD results confirm the nanostructured TiO2 thin films having crystalline nature with anatase phase. The characterization results show that the calcined thin films having high crystallinity and the effect of iron substitution lead to decreased crystallinity. The SEM investigations of Fe-doped TiO2 films also gave evidence that the films were continuous spherical shaped particles with a nanometric range of grain size and film was porous in nature. AFM analysis establishes that the uniformity of the TiO2 thin film with average roughness values. The optical measurements show that the films having high transparency in the visible region and the optical band gap energy of Fe-doped TiO2 film with iron (Fe) decrease with increase in iron content. These important requirements for the Fe:TiO2 films are to be used as window layers in solar cells.

Nanostructured TiO2 Thin Film by Sol-Gel Spin Coating with Different Concentration

2015 ◽  
Vol 1109 ◽  
pp. 529-533
Author(s):  
Irma Hidayanti Halim Affendi ◽  
Najwa Ezira Ahmed Azhar ◽  
Puteri Sarah Mohamad Saad ◽  
Mohamad Rusop
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electrical Properties ◽  
Surface Morphology ◽  
Spin Coating ◽  
Sol Gel ◽  
Force Microscopy ◽  
Nanostructured Thin Film ◽  
Atomic Force ◽  
Current Voltage

The production of TiO2 nanostructured thin film was synthesized by sol-gel method using TiO2 nanopowder as precursor. The solution of TiO2 was then deposited as thin film onto glass substrate by spin-coating technique. The aim is to investigate the effect of concentrations on the surface morphology and electrical properties of the thin films. The effect on the surface morphology was observed by Field Emission Scanning Electron Microscopy (FESEM) and Atomic Force Microscopy (AFM). The electrical properties were then observed by two-point probe method. By measuring the current-voltage (IV) characteristic, resistivity and conductivity can be measured. The purpose of this paper is to investigate the surface morphology and the IV characteristic of the thin films.

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