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 16 of 16 for “"Semiconducting properties"”.
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Semiconducting properties of the passive films on copper
The semiconducting properties of the passive films on copper have been investigated through capacitance, photoresponse and kinetic measurements. Mott-Schottky plots show that the passive films on copper are p-type semiconductors. The metal deficits form the electron acceptors, which give rise to …
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Electrochemical studies of pyrite and galena
… or negative-going direction. The effects of semiconducting properties of pyrite on its electrochemical behavior were studied by photocurrent measurement. The results indicate that pyrite samples from Peru and Spain are all highly n-type. A spontaneous depletion layer is formed on the fresh …
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Controlling the architectures and optical properties of conjugated polymer aggregates and films
The semiconducting properties of conjugated polymers are finding use in various optoelectronic applications, including chemical sensors and light-emitting diodes. In this thesis, we investigate aggregation in conjugated polymers and how it affects the optical properties of these organic materials. …
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One-dimensional, mixed-metal sulphides – structural and physical properties
… synthesised and their structural and electronic properties investigated. The starting point was the one-dimensional sulphide Ba2CoS3, which shows one-dimensional anti-ferromagnetism, metallic-like behaviour and a small negative magnetoresistance. Cationic substitutions were carried out on both …
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Electronic properties and microstructure of nanoparticulate silicon systems for diode applications
In printed electronics the use of semiconducting silicon nanoparticles allows more than the simple printing of conductive materials. It gives the possibility of fabricating robust and inexpensive, active components. This work presents the design, fabrication, and characterization of Schottky …
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Field-effect transistors on monolayer transition metal dichalcogenides synthesized by chemical vapor deposition
… their unique electronic, optical, and mechanical properties. These materials consist of stacked, atomically-thin sheets bonded by van der Waals forces. 2DMs are suited for electronic applications due to their superb transport properties and resistance to short channel effects, especially if a …
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Understanding the properties of the interface between graphene and transition metal oxide thin films using first principle approaches
… The nal composite embodies both the transport properties of the former and the semiconducting properties of the latter species. This work describes an analysis of the electronic and optical properties of the nal composite studied using the Density Functional Theory (DFT) in application to …
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Engineering design criteria for high temperature thermoelectric generation based on molten compounds
… application. Low cost molten compounds with semiconducting properties are therefore proposed as a cost-effective addition to solid-state materials for these conditions. The performance of a laboratory-scale TE test cell based on molten SnS is demonstrated which reports Seebeck coefficient, …
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Structure- and Composition-Performance Relationships of Electrically Conductive Metal-Organic Frameworks, Conjugated Porous Organic Polymers, and Fused Aromatics
… constant materials exhibit distinct electronic properties caused by different dimensionality and supramolecular interactions between structural motifs. Chapter 4 presents polymeric tetraoxa[8]circulenes as a new family of porous organic polymers with light-switchable and tunable semiconducting …
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Computational studies of solid state materials for practical applications
… the band gap energies in a series of Pb3C6X6 semiconducting extended-network organic structures, to determine the phase stability in the NiTi alloy system, and to study the surface of the (bcc) B2 phase of NiTi. To reveal the molecular structure and optoelectronic properties of these …
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Electrical and magnetic properties of organic semiconductors: Electrical conductivity and electron spin resonance studies of semiconducting, organic, charge transfer salts.
… synthesised and their electrical and magnetic properties were investigated. These salts show unusual electrical and magnetic behaviour in contrast to conventional organic compounds. These salts have crystal structures which in general consist of TCNQ radical ions stacked in chains, isolated …
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Novel oligomeric and polymeric materials based upon the dibenzotetraaza[14]annulenes.
… has a direct effect on any liquid crystalline or semiconducting properties the material may exhibit. Consequently the preparation of unsymmetrical dibenzotetraaza[14]annulenes has been undertaken, which has often required extended stepwise synthetic reaction pathways involving the use of …
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Investigation on the Properties of Nanowire Structures and Hillocks of Group-III Nitride Materials
… are increasingly important, because of their semiconducting properties and bandgaps tuneable across a wide range from the infrared to ultraviolet. They are of particular interest for optoelectronic and power electronic applications. The studies on nitride materials are comprehensive, and one …
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Template-Directed Synthesis of One-Dimensional Hybrid Nanostructures from Cylindrical Polymer Brushes
… due to their electronic, catalytic and semiconducting properties.
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An investigation into the effect of potential modifiers on the flotation of a copper sulphide ore
… in the flotation of sulphide minerals which have semiconducting properties. Electrochemical mechanisms have two valuable implications in flotation, the potential across the mineral/solution interface determines flotation recovery and the anodic oxidation reaction involving the collector is an …
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Electro-Optic And Magneto-Dielectric Properties Of Multifunctional Nitride And Oxide Materials
… that simultaneously exhibit different physical properties provide a rich area of research leading to the development of new devices. For example, materials having a strong coupling between charge and spin degrees of freedom are essential to realizing a new class of devices referred to generally …