Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"photoluminescence spectroscopy"”.
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Modulated Reflectance and Photoluminescence Spectroscopy of Epitaxial InGaAs Quantum Dot Structures /
Self-assembled InAs quantum dots (QDs), whose intersublevel transition energies lie in the mid- and far-infrared spectral range (3–25μm), have attracted particular interest as active elements of infrared photodetectors. This interest is mainly due to intriguing atomic-like quantum confinement and …
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Molecular composites of a conducting polymer: syntheses and characterization of poly(1,4-phenylenevinylene)-crown ether rotaxanes
… and characterized by NMR, IR, UV-vis, photoluminescence spectroscopy, and TGA. The molecular weight of this polymer was measured by low angle laser light scattering. The poly(1,4-phenylenevinylene) rotaxanes were isolated by dialysis and solid-liquid extraction. They were also …
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High-frequency phonon propagation and detection in III-V semiconductors
… angular dispersion of acoustic phonons in InAs. Photoluminescence spectroscopy is used to study the effects of nonequilibrium phonons on excitons in epitaxial semiconductors.
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The growth and characterisation of ordered arrays of zinc oxide nanostructures and optical studies of defects in zinc oxide
… examined by low temperature Fourier transform photoluminescence spectroscopy, where it was found that the quality of both the positioned and unpositioned nanorods was excellent. Work on an important deep level emission in ZnO (the structured green band) was also undertaken, both in …
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Ultrafast Optical Spectroscopy Techniques applied to colloidal nanocrystals
… my experimental work based on ultrafast optical spectroscopy techniques applied to colloidal nanocrystals. Colloidal semiconductor nanocrystals in recent years have attracted a lot of attention in particular in optoelectronic applications, because they present unique optical, electronic and …
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Spectroscopic characterization of dry etch-induced modification in III-V semiconductors and semiconductor heterostructures
… studied using vibrational and electronic Raman spectroscopy and low and room temperature photoluminescence spectroscopy. The frequency, intensity, and lineshape of the dipole-allowed and dipole-forbidden longitudinal optic (LO) phonon as well as the dipole-forbidden transverse optic phonon were …
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Synthesis and characterization of cadmium selenide and zinc selenide nanoparticles
… different techniques such as UV-Vis absorption spectroscopy, photoluminescence spectroscopy (PL), X-ray diffraction (XRD), transmission electron microscopy (TEM) and infrared spectroscopy (FT-IR).
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Growth and characterization of FeSi nanowires by chemical vapor deposition for gas sensing applications
… (TEM), Scanning Electron Microscopy (SEM), Photoluminescence Spectroscopy (PL), Raman Spectroscopy and Fourier Transform Infrared Spectroscopy (FTIR).
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Chemical bath deposition and electrodeposition of epitaxial semiconductor materials for application in photovoltaic devices
… of the so deposited CuI film is estimated by photoluminescence spectroscopy. This dissertation also includes three appendices. The first two appendices cover the supplementary materials for Papers I and II. The third appendix has unpublished results on thermal transformation of …
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Exciton transport and thermodynamics in gallium arsenide quantum wells
… describes the use of optical absorption and photoluminescence spectroscopy in understanding the spatial transport and energy relaxation of excitons in quantum well systems. I discuss the mechanism of carrier-induced changes in the absorption spectrum of a 210A GaAs multiple quantum well, and …
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Optical studies of DNA-wrapped carbon nanotubes
… walled carbon nanotubes. Using resonance Raman spectroscopy (RRS) and photoluminescence spectroscopy (PL), a careful characterization has been carried out on different DNA-wrapped SWNT samples to study the effects of DNA wrapping on the electronic and vibrational structure of SWNTs. Then, by …
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Towards Direct Writing Of 3-d Photonic Circuits Using Ultrafast Lasers
… a free electron model. UV/visible absorption spectroscopy, photoluminescence spectroscopy and Raman spectroscopy are used to assess the changes occurring at the atomic level. Finally, the impact of laser direct writing on nonlinear waveguide applications is discussed.
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All inorganic colloidal quantum dot LEDs
… techniques, such as Atomic Force Microscopy, photoluminescence spectroscopy, Hall Effect measurements, X-Ray Diffraction, and Ultraviolet Photoelectron Spectroscopy, used to design efficient QD-LEDs. It reviews the steps used to optimize device performance and obtain a transparent device …
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Fused Arenes-Based Molecular and Polymeric Materials for Organic Field Effect Transistors
… properties were investigated using UV-Vis and photoluminescence spectroscopy, and thermogravimetric analysis respectively. Future studies will focus on evaluating OFETs performance of these material.</p>
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Ultrafast carrier dynamics and enhanced electroabsorption in (gallium,indium)arsenide/(aluminum,indium)arsenide asymmetric double quantum well structures
… investigated by field-dependent absorption and photoluminescence spectroscopy. The results are compared to absorption changes in an undoped ADQW structure which utilizes the quantum confined Stark effect. The doped modulator exhibits a significantly larger red-shift with applied field than the …
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Mid-IR plasmon-mediated photoluminescence from gallium-doped zinc oxide bow-tie nanoantennas
… using Fourier transform infrared reflection spectroscopy. Afterwards, samples are characterized by temperature and polarization dependent photoluminescence spectroscopy in order to determine the extent to which the emission efficiency improves as a result of coupling to the nanostructures.
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Near Field Scanning Optical Microscopy: Instrument Engineering and the Investigation of Porous Gallium Arsenide Structure-Property Relationships
… = 540nm). Spatially localized near field photoluminescence spectroscopy of the crystalline and porous features was performed to elucidate the source of the observed visible photoluminescence. The near field spectroscopic analysis of the surfaces indicates that the visible photoluminescence …
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Development and optimisation of supercritical fluid deposition of semiconductor films
… by energy or wavelength dispersive X-ray spectroscopy, secondary ion mass spectroscopy, Auger electron spectroscopy, and X-ray photoelectron spectroscopy. The optoelectronic quality of the CdS and InP films was analysed by photoluminescence spectroscopy and mapping. The CdS films deposited …
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