Gamma-ray spectroscopy and multipolarity measurements of the proton-rich nucleus ⁹ₑRu

Download

index.pdf

Date

2013

Author

Aktaş, Özge

Metadata

Show full item record

Item Usage Stats

195
views

120
downloads

Hydrogenated nano/micro-cystalline silicon (nc-/c-Si:H) thin films are the key materials for Si-based thin film solar cell technology. These films have attracted great attention due to their applications in thin film solar cells. Silicon phase transition from amorphous to nano/micro-crystalline phase is an important phenomenon, especially in progress of Si thin film tandem structured solar cells. It is well-accepted fact that the development of deposition phase diagrams allows phase engineering for systematic improvement of materials and cell structures. In this thesis, crystallization dynamics of the amorphous silicon prepared via different deposition techniques such as magnetron sputtering, electron beam evaporation, CCP-assisted CVD and ICP-assisted CVD have been investigated. The advantages and disadvantages of these production methods have been debated by considering different aspects such as cost efficiency, film uniformity, deposition rate and applicability. For each technique, different deposition parameters such as deposition power, pressure, coating duration, substrate temperature, and source gas dilution were investigated comprehensively. Deposited films were analyzed in structural, morphological, optical and electrical features. Films are deposited on different substrate such as glass, quartz and Si-wafer and basic diagnostic tools like Raman Spectroscopy (RS), Grazing Incidence X-Ray Diffraction (GR-XRD), X-Ray Photoelectron Spectroscopy (XPS), Spectroscopic Ellipsometry (SE), Fourier Transform Infra-Red Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), High Resolution Transmission Electron Microscopy (HRTEM) are used as complementary methods. Crystalline volume fraction calculated by RS is assumed as the key parameter while defining the structural transition. At the end of this research, general knowledge about the crystallization parameters for different chemical and physical vapor deposition techniques was obtained. .

Subject Keywords

Gamma ray spectrometry., Nuclear physics., Protons., Angular correlations (Nuclear physics)., Polarization (Nuclear physics)., Gamma rays

URI

http://etd.lib.metu.edu.tr/upload/12616159/index.pdf
https://hdl.handle.net/11511/22779

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Effect of deposition parameters on silicon layers transition from amorphous phase to micro/nano-crystalline phase in different deposition techniques Nogay, Gizem; Turan, Raşit; Department of Physics (2013) Hydrogenated nano/micro-cystalline silicon (nc-/c-Si:H) thin films are the key materials for Si-based thin film solar cell technology. These films have attracted great attention due to their applications in thin film solar cells. Silicon phase transition from amorphous to nano/micro-crystalline phase is an important phenomenon, especially in progress of Si thin film tandem structured solar cells. It is well-accepted fact that the development of deposition phase diagrams allows phase engineering for systema...
Improvement of Laser-Crystallized Silicon Film Quality via Intermediate Dielectric Layers on a Glass Substrate Cinar, Kamil; Karaman, Mehmet; Bek, Alpan (2018-05-01) The laser crystallization (LC) of amorphous silicon thin films into polycrystalline silicon (pc-Si) thin films on glass substrates is an active field of research in the fabrication of Si-based thin film transistors and thin film solar cells. Efforts have been, in particular, focused on the improvement of LC technique. Adhesion promoters of the crystallized Si thin films at the glass interface play a crucial role in the stability and device performance of fabricated structures. The crystalline Si thin films ...
Flexible organic photovoltaics from zinc oxide nanowires grown on transparent and conducting single walled carbon nanotube thin films Ünalan, Hüsnü Emrah; Kuo, Daniel; Parekh, Bhavin; Amaratunga, Gehan; Chhowalla, Manish (Royal Society of Chemistry (RSC), 2008-01-01) The fabrication of flexible organic photovoltaics (OPVs) which utilize transparent and conducting single walled carbon nanotube (SWNT) thin films as current collecting electrodes on plastic substrates in zinc oxide nanowire (ZnO NW)/poly(3-hexylthiophene) (P3HT) bulk heterojunction photovoltaic devices is reported. The bulk heterojunctions for exciton dissociation are created by directly growing ZnO nanowires from solution on the SWNT electrodes and spin coating the P3HT polymer. A maximum OPV power convers...
Raman and XRD studies of Ge nanocrystals in alumina films grown by RF-magnetron sputtering Caldelas, R.; Rolo, A. G.; Gomes, M. J. M.; Alves, E.; Ramos, A. R.; Conde, O.; Yerci, Selçuk; Turan, Raşit (2008-08-08) Germanium (Ge) nanocrystals (NCs) embedded in alumina thin films were produced by deposition on fused silica and silicon (111) substrates using radio-frequency (RF) magnetron sputtering. The films were characterised by both Raman and X-ray diffraction (XRD) spectroscopy. The deposition conditions were optimised in order to obtain crystalline Ge nanoparticles. In as-deposited films, the typical NC size was similar to 3 nm as estimated by means of X-ray diffraction. Raman spectra taken from as-deposited films...
Photon-to-carrier efficiencies of nanostructured zinc-phthalocyanine/fullerene thin films assessed by time-resolved terahertz spectroscopy Esentürk, Okan; Lane, Paul A.; Heilweil, Edwin J. (null; 2008-01-01) Blend and multilayer Zinc-phthalocyanine/fullerene thin films were investigated as model active layers for solar cells by Time-Resolved Terahertz Spectroscopy. A strong dependence on the blend ratio and multilayer nano-structure of the films was found

Citation Formats

Ö. Aktaş, “Gamma-ray spectroscopy and multipolarity measurements of the proton-rich nucleus ⁹ₑRu,” M.S. - Master of Science, Middle East Technical University, 2013.