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 120 for “"chalcogenide"”.
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LOW-DIMENSIONAL CHALCOGENIDE BASED THERMOELECTRIC COMPOSITES
… reflux method, a series of low-dimensional chalcogenide nanostructures were designed. On one hand, ternary metal (Bi, Cu, Ag, and Pb) chalcogenide nanowires with high thermoelectric figure of merit and power factors were obtained by using Te1-xSex alloys as templates. On the other hand, …
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New Directions in Metal Chalcogenide Nanochemistry
Colloidal semiconductor nanocrystals have shown great promise in functional devices such as solar cells and LEDs, but still relatively little is understood about the chemistry of their formation and resulting structure. In this thesis, we describe the results of our study of ultrathin Bi2S3 …
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Optical micro-resonators in chalcogenide glass
This thesis focuses on the production of gallium lanthanum sulphide (GLS) microspheres and their potential uses. Microspheres, and micro-resonators in general, have attracted considerable attention because of their promise in all-optical-switching, micro-lasers, multiplexers and many other …
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Planar chalcogenide glass materials and devices
… need in the field of biochemical sensing. Chalcogenide glasses have been identified as the material of choice for sensing due to their wide infrared transparency window; on the device side, we have fabricated optical resonator devices that dramatically amplify the photon-molecule …
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Properties and Processing of Chalcogenide Perovskites
… and compatibility with low-cost manufacturing. Chalcogenide perovskite materials show promise to meet these criteria but are at an early stage of development. Other promising optoelectronic materials, such as lead halides perovskites, have shown remarkable strides in optoelectronic performance, …
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Synthesis and Characterization of Chalcogenide Perovskites
Chalcogenide perovskites are both an old and new group of materials. First synthesized in 1957, chalcogenide perovskites are generally sulfur and selenium compounds which contain a 3D network of corner-sharing octahedra. Not until 2015 was this material class recognized as being suitable for any …
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Modified chalcogenide glasses for optical device applications
This thesis focuses on two different, but complementary, aspects of the modification of gallium lanthanum sulphide (GLS) glasses. Firstly the addition of transition metal ions as dopants is examined and their potential for use as active optical materials is explored. It is also argued that the …
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Modified chalcogenide glasses for optical device applications
This thesis focuses on two different, but complementary, aspects of the modification ofgallium lanthanum sulphide (GLS) glasses. Firstly the addition of transition metal ionsas dopants is examined and their potential for use as active optical materials is explored.It is also argued that the …
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Chalcogenide glass materials for integrated infrared photonics
Chalcogenide glasses (ChGs) are amorphous compounds containing the chalcogen elements (S, Se, Te) and exhibit wide infrared transparency windows. They are easy to synthesize in bulk and thin film forms and their compositional flexibility allows tuning of optical properties such as refractive index …
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Metal Chalcogenide Nanocrystal Assembly: From Synthesis To Applications
… subsequent surface oxidation reaction to form chalcogenide linkages is the key.</p> <p>Cation-exchange reactions in metal chalcogenide gels were explored for the first time. Ag2Se wet gel monoliths were successfully prepared by an ion-exchange reaction of a monolithic CdSe wet gel and converted …
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Chalcogenide glasses for advanced photonic and photovoltaic applications
Chalcogenide glasses, namely the amorphous compounds containing sulfur, selenium, and/or tellurium, have emerged as a promising material candidate for integrated photonics given their wide infrared transparency window, low processing temperature, almost infinite capacity for composition alloying, …
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Processing of Thin Film Photovoltaics from Chalcogenide Nanoparticles
Over the last few decades, it has become evident that current energy production for humanity since the industrial revolution has incurred the emission of greenhouse gases (GHGs) into the Earth’s atmosphere, resulting in rampant pollution, global warming, ocean acidification and other disastrous …
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The Magnetic Exchange Interactions in Chromium Chalcogenide Spinels
The chromium chalcogenide spinels, MCr2X4 (M = Zn, Cd, Hg; X = O, S, Se), have been the subject of considerable interest in recent years. In each case the crystal structure is that of a normal spinel with the chromium ions exclusively occupying the octahedral (B) sites, so that when diamagnetic …
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Synthesis and Reactivity of Some Organometallic Chalcogenide Complexes
Examples of Sila-1,1-dithiolate complexes, Cp$\sb2$MS$\sb2$SiMe$\sb2$ (M = Ti (8) and V) and PtS$\sb2$SiMe$\sb2$(P(C$\sb6$H$\sb5$)$\sb3$)$\sb2$, were prepared by treating (Me$\sb2$SiS)$\sb3$/Li$\sb2$S with the metal dichlorides. Compound 8 is particularly interesting because it contains two …
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Transient transport and optical studies of chalcogenide glasses
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1985.
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Evaluation Of The Photo-induced Structural Mechanisms In Chalcogenide
Chalcogenide glasses and their use in a wide range of optical, electronic and memory applications, has created a need for a more thorough understanding of material property variation as a function of composition and in geometries representative of actual devices. This study evaluates compositional …
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Chalcogenide thin film materials for next generation data storage
… form of amorphous and crystalline marks within a chalcogenide thin film. Commonly Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> is used as the active data storage material to record these two different phases. Changes in phase are induced by controlled heating and cooling with laser radiation or an …
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