Sökning: "narrow gap semiconductors"
Visar resultat 1 - 5 av 8 avhandlingar innehållade orden narrow gap semiconductors.
1. Thermoelectric Properties of Antimony Based Networks
Sammanfattning : With the retreating sources of carbon based fuels, thermoelectric materials can play an important role in the future of environmentally friendly power generators. Sb based framework have in some cases shown some promising properties as thermoelectric materials. The physical properties may be modified with doping or incorporation of new elements. LÄS MER
2. Density functional calculations of optical spectra and narrow band systems
Sammanfattning : A calculational method, based on density functionaltheory, has been used to calculate optica spectra for a wide range of systems,as well as ground-state properties of some narrow-band systems. A systematic study of the trends in the optical properties of the 4Brefractory metal compounds has been performed. LÄS MER
3. Electrical Characterization of III-V Nanostructure
Sammanfattning : This thesis investigates the electronic properties of a number of novel III-V materials and material combinations for transistor applications. In particular, high-κ/InAs metal-oxide-semiconductor (MOS) structures and transport properties of GaSb nanowires have been studied. LÄS MER
4. On the Growth and Properties of InAs/Ga1-xInxSb Superlattices and Related Materials
Sammanfattning : InAs/Ga1-xInxSb semiconductor superlattices and their constituent materials have been studied theoretically, grown by molecular-beam epitaxy and characterised by various techniques. InAs/Ga1-xInxSb superlattices are interesting for use in far-infrared detectors because of their narrow band gaps. LÄS MER
5. Electronic structure and optical properties of PbY and SnY (Y=S, Se, and Te)
Sammanfattning : Lead chalcogenides and tin chalcogenides and their alloys are IV−VI family semiconductors with unique material properties compared with similar semiconductors. For instance, PbY (Y = S, Se, and Te) are narrow-gap semiconductors with anomalous negative pressure coefficient and positive temperature coefficient. LÄS MER