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CHAPTER TWO: SYNTHESIS OF ZnO THIN FILMS.

No Fear Shakespeare puts Shakespeares language side-by-side with a facing-page translation into ...Thesis zno thin films.

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SPUTTER DEPOSITION OF ZNO THIN FILMS By LOREN ...

Atomic Layer Deposition of Thermoelectric ZnO Thin Films File Format: PDF/Adobe Acrobat Dec 13, 2013 ... A doctoral dissertation completed for the degree of Doctor of.

In situ monitoring of the effect of ionic strength and pH on plasma polymer thin films.

Abstract:
The interest in the interaction of laser pulses with materials for formation of noble metal nanoparticles in order to design photonic structures with novel optical properties is provoked by the development of the modern optoelectronics, which is based on nanostructured materials, and the need to refine the fundamental concepts of the effect of laser beams on the properties of inhomogeneous media. One of the approaches to developing novel materials and improving their functions is to combine two or more functional phases. The investigation of nanoparticle-doped transparent materials could determine the effective methods for fabrication to control the spatial distribution of nanoparticles in the glass matrice. The size of nanoparticles and their spatial distribution can be controlled by the conditions of the laser deposition and the parameters of laser irradiation. Noble metal doped thin films are grown from a mosaic target, consisted of glass covered by a sector of Ag or Au. Thus, the ablation of a rotating target during the PLD (pulsed laser deposition) process results in the growing of composite thin films. A nanosecond fourth-harmonic Nd:YAG laser is used for ablation at room temperature in a vacuum chamber. A laser-assisted method for manipulation of the optical properties of the grown nanocomposite material is applied. The changes of structural and morphological properties are studied with respect the induced defectrs and coloration of the samples. The influence of the nanosecond UV-laser annealing on the optical spectra and plasmon resonance properties of the samples is investigated.

The thesis presents the research results on ZnO thin films which ...

Abstract:
The interest in the interaction of laser pulses with materials for formation of noble metal nanoparticles in order to design photonic structures with novel optical properties is provoked by the development of the modern optoelectronics, which is based on nanostructured materials, and the need to refine the fundamental concepts of the effect of laser beams on the properties of inhomogeneous media. One of the approaches to developing novel materials and improving their functions is to combine two or more functional phases. The investigation of nanoparticle-doped transparent materials could determine the effective methods for fabrication to control the spatial distribution of nanoparticles in the glass matrice. The size of nanoparticles and their spatial distribution can be controlled by the conditions of the laser deposition and the parameters of laser irradiation. Noble metal doped thin films are grown from a mosaic target, consisted of glass covered by a sector of Ag or Au. Thus, the ablation of a rotating target during the PLD (pulsed laser deposition) process results in the growing of composite thin films. A nanosecond fourth-harmonic Nd:YAG laser is used for ablation at room temperature in a vacuum chamber. A laser-assisted method for manipulation of the optical properties of the grown nanocomposite material is applied. The changes of structural and morphological properties are studied with respect the induced defectrs and coloration of the samples. The influence of the nanosecond UV-laser annealing on the optical spectra and plasmon resonance properties of the samples is investigated.

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.

optical constants, and the optical band gap of the ZnO thin films.

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.

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.

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Topic: Thesis On Zno Thin Films – 162861 | България …

Abstract:
Although Silicon is the dominant technology in photovoltaic area, in a surprisingly short time, Hybrid Inorganic-Organic perovskites, lead halide MAPbI3 typically, have emerged with excellent photophysical properties reaching similar solar efficiencies as commercial CdTe and CIGS thin films solar cells, surpassing 20% certified efficiency.[1] Perovskite solar cells have the advantage of enabling cost-effective and low temperature processing. However, there are critical yet unresolved issues such as reproducibility, stability in environmental conditions and toxicity of its components. We have previously shown that substrate nature influences the final properties of the MAPbI3 thin film in terms of deegre of preferential orientation, lattice paramenters and optical bulk properties.[2] On the other hand, due to its excellent electronic and optical properties, graphene is also being intensively studied for optoelectronic applications. It is described here how the optical and structural properties are affected by the partial substitution of lead by other less toxic ions and how the incorporation of graphene in the active layer can lead to a marked improvement in the yield of the graphene-free sample. In addition, an increase in environmental stability was observed due to the inhibition of PbI2 formation.

Society of Vacuum Coaters - SVC Education Program

He has previously worked on electrical and optical studies of PbS nanocrystals, synthesis of PbS/Graphene nanocomposites and field emission properties of PbS thin films which was published in international conference proceeding and Journal of Advanced Microscopy Research.

UVO-Cleaner Studies Using Jelight Company Inc. Products

Biography:
I am the head of the Department Surface Chemistry and Catalysis in the Institute of Physical Chemistry of the Romanian Academy, Bucharest, Romania and PhD advisor. The main area of expertise includes surface and optical characterization of thin films, theoretical modeling; characterization of the superficial and interfacial layers; fundamentals research in spectroscopic ellipsometry and data analysis.I have published 138 scientific papers in internationally recognized ISI journals, 1 patent, 1 book, 12 book chapters edited by international publishers, and 71 scientific reports for industry (unpublished). I am the organizer of the annual international workshop: Current trends in advanced ellipsometry.

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