Optoelectronic Properties of Fluorine and Cobalt Co-Doped Tin Oxide Thin Films Deposited by Chemical Spray Pyrolysis

2019 ◽  
Vol 60 ◽  
pp. 63-75 ◽  
Author(s):  
Naoual Houaidji ◽  
Mejda Ajili ◽  
Baghdadi Chouial ◽  
Najoua Turki Kamoun ◽  
Kenza Kamli ◽  
...  
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Carrier Concentration ◽  
Tin Oxide ◽  
Hall Mobility ◽  
Spray Pyrolysis Method ◽  
Chemical Spray Pyrolysis ◽  
Glass Substrates ◽  
Chemical Spray ◽  
Co Doped

Transparent conducting Cobalt-fluorine co-doped tin oxide (SnO2: (Co, F)) thin filmswere deposited onto preheated glass substrates using the chemical spray pyrolysis method. The ([Co2+]/[Sn4+]) atomic concentration ratio (y)in the spray solution was varied between 0 and 5 at. %. The structural, electrical, optical and photoluminescence properties of these films were studied. It is found that the thin films are polycrystalline with a tetragonal crystal structure corresponding to SnO2 phase having a preferred orientation along the (200) plane. Transmission and reflection spectra reveal the presence of interference fringes indicating thickness uniformity and surface homogeneity of the deposited thin films. The electrical resistivity (ρ), volume carrier concentration density (Nv), surface carrier concentration density (Ns) and Hall mobility (μ) of the synthesized thin films were determined from the Hall Effect measurements in the Van der Paw-configuration and the following results were obtained: n-type conductivity in all deposited films, a low resistivity of 1.16×10-2 Ω.cm, and a high Hall mobility of 15.13×102 cm2.V-1.s-1with Co concentration equals to 3 at. %. These results show that the electrical properties of these thin films where greatly improved making them suitable as ohmic contact in photovoltaic application devices.

SYNTHESIS AND CHARACTERIZATION OF NANOCRYSTALLINE Co-DOPED ZnO THIN FILMS PREPARED BY CHEMICAL SPRAY PYROLYSIS FOR OPTOELECTRONIC APPLICATIONS

2021 ◽  
Author(s):  
FAEZ M. HASSAN ◽  
AUS A. NAJIM
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Doping Concentration ◽  
Chemical Spray Pyrolysis ◽  
Co Doping ◽  
Glass Substrates ◽  
Chemical Spray ◽  
Good Transparency ◽  
The Impact ◽  
Co Doped

ZnO:Co thin films were synthesized by the chemical spray pyrolysis (CSP) on glass substrates. Then, investigated the impact of Co doping concentration on its physical properties. XRD analyses show that all films have a polycrystalline structure of hexagonal ZnO. The crystallite size increased from 18[Formula: see text]nm to 25[Formula: see text]nm with Co doping concentrations. Furthermore, the unit cell volume increased from 47.485[Formula: see text]Å to 47.831[Formula: see text]Å, and the Zn–O bond length expanded from 1.97588[Formula: see text]Å to 1.98071[Formula: see text]Å. SEM observations reveal the formation of fiber-like nanostructures in the Co-doped thin films. The diameter of nanofibers increased with Co doping concentration from 260[Formula: see text]nm to 700[Formula: see text]nm. The optical characteristics were studied by the UV-Visible spectrophotometer and manifest the optical transparency vary with Co doping. In addition, the band gap decreases from 3.27[Formula: see text]eV to 2.73[Formula: see text]eV with increasing Co doping concentrations. The conductivity varied from 3.35[Formula: see text]S[Formula: see text][Formula: see text][Formula: see text]m[Formula: see text] to 19.88[Formula: see text]S[Formula: see text][Formula: see text][Formula: see text]m[Formula: see text] with Co doping concentrations. Empirical models were proposed to evaluate the correlated variables with excellent accuracy with the experimental data. The best result was accomplished in ZnO:Co1% films, where good transparency and high conductivity were achieved.

scholarly journals Synthesis of ZnO thin film by chemical spray pyrolysis using its nano powder

2021 ◽  
Vol 49 (1) ◽  
Author(s):  
Reem S. Khaleel ◽  
◽  
Mustafa Sh. Hashim ◽  
Samer Gh. Majeed ◽  
◽  
...  
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Chemical Spray Pyrolysis ◽  
Sem Images ◽  
X Ray ◽  
Spray Process ◽  
Glass Substrates ◽  
Chemical Spray ◽  
Zno Powders ◽  
Deposited Films

The deposition of metal oxides powder faces several problems, including poor adhesion to the bases deposited on them, the presence of many cracks, poor thickness control, and other disadvantages. The current study gives a new and simple idea to deposit thin films using two ZnO powders with nano and microparticle sizes on glass substrates. This was done by transforming the powders to Zinc acetate and then using chemical spray pyrolysis to deposit ZnO thin films. Scanning electron microscope (SEM) images showed that the prepared film from the nanopowder (ZnONano) lost the independence of powder’s nanoparticles and became a homogeneous film with nano projections. But the deposited one from the micro powder (ZnOMicro) had both nanorods and nanoplates. The different shapes and sizes of ZnO particles in ZnOMicro powder were disappeared after the Spray process. The two deposited films were homogeneous, crack-free and there were controllable thicknesses during the deposition. X-ray spectroscopy (EDS) was used to measure weights and atomic percentages of elements for the deposited films. The structures of the deposited films were approximately identical as the X-ray diffraction (XRD) technique showed. The optical properties of these two films were studied and their parameters were measured and calculated.

scholarly journals Preparation and Characterization of Transparent Conducting FTO Thin Films by Chemical Spray Pyrolysis Method

2018 ◽  
Vol 4 (5) ◽  
pp. 572-574 ◽  
Author(s):  
Ebitha Eqbal ◽  
E. Hilal Rahman ◽  
E.I. Anila
Keyword(s):  
Thin Films ◽  
Spray Pyrolysis ◽  
Deep Level ◽  
Spray Pyrolysis Method ◽  
Near Band Edge ◽  
Chemical Spray Pyrolysis ◽  
Homogeneous Surface ◽  
Orthorhombic Crystal Structure ◽  
Pyrolysis Method ◽  
Chemical Spray

Fluorine doped tin oxide (FTO) thin films were synthesized by chemical spray pyrolysis method on glass substrates for 10 at.%, 15 at.%, 20 at.% of fluorine doping concentrations. Their structural, optical and electrical properties were investigated. X-ray diffraction (XRD) study shows polycrystalline nature of the films with orthorhombic crystal structure. The grain size (D) was observed in the range of 14 nm to 30 nm. The FESEM images of the FTO thin films reveals that the films have smooth and homogeneous surface morphology with thin granular grains distributed throughout the surface. EDX analysis confirms the presence of Sn, O and F elements in the prepared FTO thin films. Photoluminescence (PL) spectrum shows a broad emission which covers near band edge (NBE) as well as deep level emissions (DLE) in the region 380 nm and 620 nm. From the hall effect measurements, it was observed that all the films exhibit n-type conductivity. The sample grown with 10 at. % of fluorine showed the highest transmission percentage (80%) with high mobility and conductivity, which are basic requirements for a TCO.

scholarly journals Study of some structural , optical , Electrical Properties of CdS thin films deposited by chemical Spray Pyrolysis Method

2009 ◽  
Vol 6 (3) ◽  
pp. 519-225
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thin Films ◽  
Electrical Properties ◽  
Spray Pyrolysis ◽  
Energy Gap ◽  
Hall Effect Measurement ◽  
Spray Pyrolysis Method ◽  
Chemical Spray Pyrolysis ◽  
Glass Substrates ◽  
Pyrolysis Method ◽  
Cds Thin Films

In this research we prepared CdS thin films by Spray pyrolysis method on a glass substrates and we study its structural , optical , electrical properties .The result of (X-Ray ) diffraction showed that all thin films have a polycrystalline structure , The relation of the transmission as a function of wavelength for the CdS films had been studied , The investigated of direct energy gap of the CdS its value is (2.83 eV). In Hall effect measurement of the CdS we find the charge carriers is p – type and Hall coefficient 1157.33(cm3/c) ,Hall mobility 6.77(cm2/v.s)

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