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College Essays: THESIS ZINC OXIDE THIN FILMS …

Al-doped Zinc Oxide as a Transparent Conductive Material (Thesis, Master of Science (MSc)).

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Nitrogen doped zinc oxide thin film (Thesis…

Biography:
Assoc. Prof. Mihaela Koleva is a researcher of multidisciplinary areas of expertise. She graduated a Chemical Engineering at the UCTM-Sofia and defends a PhD thesis in Physics in 2001 at the Institute of electronics – BAS. She was a Postdoc fellow in NIMS-Tsukuba, Japan and a visiting scientist in many worldwide leading laboratories for laser growing of nanomaterials. Her scientific interests cover metal and oxide thin films and nanostructures, fabricated by laser techniques. She conducted experiments on pulsed laser deposition and laser modification of ferrite and optical materials and investigation of their properties. Her recent research is focused on the composite nanostructures with plasmonic nanoparticles for different potential applications.

The photo-luminescence (PL) of bulk zinc oxide was examined at highresolution.

Biography:
Assoc. Prof. Mihaela Koleva is a researcher of multidisciplinary areas of expertise. She graduated a Chemical Engineering at the UCTM-Sofia and defends a PhD thesis in Physics in 2001 at the Institute of electronics – BAS. She was a Postdoc fellow in NIMS-Tsukuba, Japan and a visiting scientist in many worldwide leading laboratories for laser growing of nanomaterials. Her scientific interests cover metal and oxide thin films and nanostructures, fabricated by laser techniques. She conducted experiments on pulsed laser deposition and laser modification of ferrite and optical materials and investigation of their properties. Her recent research is focused on the composite nanostructures with plasmonic nanoparticles for different potential applications.

Thesis Zinc Oxide Thin Films: For Academic Writing

Title of Talk: Environmental Application of Nanosized Zinc Oxide (ZnO) for Water treatments

Thin films deposition techniques have been described in the book especially chemical deposition methods. Copper oxide thin films deposition using chemical spray pyrolysis, chemical bath and drop-chemical deposition techniques, and characterization such as compositional by AES, structural by XRD, morphological by SEM, electrical, optical by UViR double beam spectrometer, photo-electrochemical and current-voltage analyses have been described. Also CdS thin film of spray pyrolysis deposition and ZnO thin film of electrochemical deposition methods have been described shortly. The characterizations of the CuO-CdS heterojunction for rectification and the characterization of the Cu2O-ZnO heterojunction for rectification and solar cell application have been described.

The application of SALD in the industrial-scale coating of CIGS solar cells, large metal sheets and glass substrates with oxide and sulfide thin films could be realized using similar equipment.

Transparent aluminium zinc oxide thin films with …

Title of Talk: Environmental Application of Nanosized Zinc Oxide (ZnO) for Water treatments

Zinc Oxide (ZnO) thin films have drawn considerable interest due to its excellent material properties such as wide and direct band gap, high electron mobility and large exciton binding energy. In order to realise the applications of these devices, fabrication of high quality p-type ZnO thin films are very essential. In this work p-ZnO/n-ZnO and p-ZnO/n-Si type of junctions were realised by depositing the (Al, N) doped p-ZnO films on glass and silicon substrate using low cost sol gel as well as dip coating techniques. The characterization of deposited thin films was carried out by XRD, UV visible spectroscopy, and I-V measurements. For qualitative confirmation for p-type conduction of deposited ZnO thin film hot probe method is utilised. A comparative study of the different p-n junctions was done, where homo-junction between p-ZnO (dip coated) and n-ZnO(sputtered) shows a better diode characterises.

Throughout this research work, homemade Spray pyrolysis technique is used to synthesize thin films. Zinc Oxide (ZnO) and Bismuth ferrite (BiFeO3, BFO) thin films are prepared using this technique. ZnO thin films are prepared using Zinc Chloride ZnCl2 as a precursor. BFO thin films are prepared using Bi(NO3)3.5H2O and Fe(NO3)3.9H2O in the precursor solution. XRD analysis is done for phase confirmation. Multilayer thin films of BiFeO3 and ZnO have been synthesized. FESEM analysis, UV-Vis analysis has been done for surface morphology, bandgap calculation. Temperature dependence of resistance has also been studied. BFO-ZnO junction is prepared and its R-T and I-V measurement has been done to compare with the results obtained from multi-layers.

Role of zinc oxide thickness on the photovoltaic performance of laminated organic bulk-heterojunction solar cells.
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Zinc Oxide Thin Films for Dye-Sensitized Solar Cell Applications

It is now known that non-stoichiometric and doped films of oxides of tin, indium, cadmium, zinc and their various alloys exhibit high transmittance and nearly metallic conductivity is achievable .

Plasma Treatment Of Zinc Oxide Thin Film And …

However, tin doped indium oxide (ITO), with reported transmittance and conductivity as high as 95% and 1e4 -1cm-1 respectively, is among the most popular of these thin films which have found a host of electronic, opto-electronic and mechanical applications.

Zinc Oxide Thin Film and Temperature Sensing Using the ..

(2016) Zinc Precursor Synthesis and the Aerosol Assisted Chemical Vapour Deposition of Zinc Oxide Thin Films. Doctoral thesis , UCL (University College London).

Zinc oxide -- Electric properties, Zinc oxide thin films, ..

Thin films (ca 100 nm) were fabricated by spin-coating the Al-doped Zinc citrate sol-gels onto glass and quartz substrates, followed by a drying step and annealing at 500◦C.

2006 Zinc oxide thin films prepared by thermal ..

You could take some wine and add ethanol to it as the independent variable. The problem is - where do you get ethanol from? Your school may not have a licence to buy 100% (absolute) ethanol, or even the 95% azeotropic mixture (with water) so you may have to distill your own from shop-bought wine (ask your teacher before you bring any to school). From the density of the distillate (use an SG bottle) you can calculate how much to add to some fresh wine.

4. Additives.
Sulfur dioxide should prevent the growth of acetic acid bacteria in wine and is sometimes used commercially for this purpose. SO2 in wine consists of the free form (molecular SO2, bisufite ions HSO3-and sulfite ions SO32-) and a bonded form. At normal wine pH only about 5% of the free SO2 occurs in the molecular form (which is the most active anti-microbial form) and the other 95% as bisulfite and sulfite ions. Concentrations of up to 20 mg/L of free SO2 will kill the bacteria.

"Investigation of zinc oxide (ZnO) thin films" by …

Abstract:
In this work, we present experimental studies of two earth abundant thin film solar cell materials: Cu2ZnxFe1-xSnS4 and Zn(S,O). Cu2ZnxFe1-xSnS4 and Zn(S,O) are among the most promising candidates to substitute CIGS and CdS as aborber and buffer layers, respectively, in thin film solar cells. Using different characterization techniques such as UV-Vis-NIR spectroscopy, X-ray diffraction, atomic force microscopy, we demonstrate that both materials exhibit structural, morphological and optical properties that are suitable for solar cell applications. The optical constants of the films were calculated from the analysis of the transmittance and reflectance data in the spectral range 300-1800 nm. The band gap energy of both materials varied from 1.10 to 1.55 eV and from 3.27 to 3.08 eV depending on the sulphur and zinc content, respectively. X-ray diffraction patterns show that all Cu2ZnxFe1-xSnS4 and Zn(S,O) films were polycrystalline in nature with a preferential growth along (112) and (002) planes, respectively.

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