ISSN: 1813-0410

Keywords : ZnO

Study the Effect of Copper (Cu) Doping on the Structure Properties of Zinc Oxide (ZnO) Prepared by Using Pulsed Laser Deposition (PLD)

Ghaleb Ali Al-Dahash; Qussay Mohammed Salman; Majid F. Haddawi

journal of kerbala university, Volume 13, Issue 2, Pages 87-95

In this research the structural properties for pure zinc oxide (ZnO) thin films and ZnO doped with (6 and 9) % weight percentage of copper have been investigated. The thin films have prepared by using pulsed laser deposition (PLD) technique, they synthesized by using the following parameters; Nd:YAG laser (λ=1064 nm), repetition rate of (6 Hz), pulse duration of (10 ns), energy (100 mJ) and vacuum pressure (10-5 mbar). The thin films have deposited on glass substrate at (2500C). The XRD shown the films were polycrystalline in hexagonal phase with peaks belong to cubic phase. The calculations from XRD data shown the crystallite size decreasing from (46.98-56.57) nm for pure zinc oxide to (34.70 and 44.49 nm) for copper doped ZnO with (6 and 9) % respectively, other structure parameters (bond length, dislocation density, lattice constants, strain) have been calculated. Investigated by AFM and SEM confirm that thin films have high homogeneity and the grains have rod-like structure. The EDX diagram didn’t show any other phase which indicate that the doping substitution type because closeness between Zn and Cu atoms.

Investigate the electron structure and magnetic properties of carbon doped zinc oxide nanosheet: DFT

Nibras Mossa Umran; Oras Muosa Imran; Ruwaidah Kareem Abd-Ulmunem

journal of kerbala university, Volume 11, Issue 2, Pages 98-105

In the present work the Density functional theory (DFT) calculations were performed on the electron structure and magnetic properties of Carbon-doped ZnO nanosheet. The predicted for carbon doping modifies the electronic structure of ZnO nanosheet. Through optimized the Cn-ZnO (n=1-7) compounds, we found that compounds are stable. Also calculated binding energy and ionization potential of carbon exohedral doping ZnO nanosheet. The compounds have been found to be more chemically reactive. Mullikan charge analysis shows the presence of the magnetic moment in these systems.

Fabrication based porous silicon photo-detector and improving its spectral responsivity by depositing IZO thin films

Wisam J. Aziz and Abbas K. Jarhallah

journal of kerbala university, Volume 10, Issue 2, Pages 166-172

In this work porous silicon was prepared by electrochemical etching, then IZO thin films were deposited on porous silicon. SEM pictures showed different morphology for all from porous silicon and IZO films deposited on porous silicon. The pores diameter ranges from (0.5-1 μ m). AFM pictures showed the smoothness increased with depositing IZO films. The average roughness is (34.12 nm), (23.4 nm) and the root mean square is approximately (41.88 nm), (28 nm) for porous silicon and IZO film deposited on porous silicon respectively. The results showed increasing of the spectral responsivity with depositing IZO film. Spectral responsivity for photo detractor is about (0.69 A / Watt) then it improved by depositing IZO films and becomes (0.84 A / Watt).

Fabricating and characterizing of ZnO nanostructure solar cells

Wisam J. Aziz

journal of kerbala university, Volume 9, Issue 2, Pages 287-292

Zinc oxide (ZnO) thin film on crystalline silicon (c-Si) substrate has been deposited by RF sputtering method to use it for fabricating a solar cell. Structural properties of ZnO films studied using high resolution X-ray diffraction (HRXRD) analysis of the films which show that the films have polycrystalline nature with orientation (002). Small crystallite size of prepared films was calculated using Scherrir formula that indicates our films are within Nano scale. In addition, optical properties have been done via scanning electron microscopy (SEM) which used to describe the surface morphology and Photoluminescence (PL) measurements which revealed that the energy bandgap of prepared films were in the UV emission at 380 nm. Finally, thickness of the films was measured with Filmetric (F-20). Our findings were the fabricated ZnO films are successful in simple and low cost method with high quality and unexpected nanostructure behavior. Good current-voltage behavior with high conversion efficiency of 14.5 % has been obtained.

Dielectric behavior and Ac conductivity measurements of bulk (TiO2, ZnO/Epoxy) composites

Abdullah A. Hussein; Abdulwahab. A.Sultan; Tahseen A. Saki

journal of kerbala university, Volume 8, Issue 1, Pages 348-356

Dielectric behavior and ac conductivity measurements on epoxy resin filled with (5, 10, 15, 20, 25 wt.%.) micro sized particles of TiO2 and ZnO have been studied.. The measurements were carried out in the frequency range (120Hz - 2MHz) and over a wide temperature 30 ◦C and 110◦C. Different dielectric behavior was observed depending on filler type, filler contact, frequency and temperature.
Results show that dielectric permittivity (ε') and dielectric loss(ε") increases with the addition of epoxy resin, which has been attributed to interfacial polarization. The value of (ε') increased with increasing temperature, due to the greater freedom for movement of the dipole molecular chains within the epoxy at high temperature. The value of (ε') decreases with increasing frequency, which indicates that the major contribution to the polarization comes from orientation polarization. Interfacial relaxation is found to be strongly dependent on the presence of micro-filler particles. The Alternating Current (AC) conductivity increases as the temperature and frequency, because of the segmental mobility and electrical conduction.

Synthesis of Nano particle ZnO-organic Nanohybrid and its role in Controlled Release of 4-Chlorophenoxy Acetate from the lamella of ZnO nanocomposite

Abbas Matrod Bashi

journal of kerbala university, Volume 5, Issue 1, Pages 1-8

Direct intercalation of 4-Chlorophenoxyacetate into ZLH interlayer was obtained by reacting ZnO with 4-Chlorophenoxyacetic acid. The resulting Nanohybrid material is white needle like-crystals with two phases at 21.25. and 18.69 Å respectively. This was characterized using XRD. SEM and TEM to show a fibrous nonohybrid structure. The controlled release study showed that within 2000 min. the accumulation of 4-Chlorophenoxyacetate is 94% and t ½ value of 990 min. That is an indication, ZnO can be used to study the controlled release delivery of herbicide active molecules.