Sökning: "semiconductors"

Visar resultat 11 - 15 av 327 avhandlingar innehållade ordet semiconductors.

1. 11. Thermoelectric Ba8Ga16Ge30 clathrates for waste heat recovery

   Författare :Daniel Cederkrantz; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; thermal stability; substitution; thermal conductivity; Seebeck coefficient; electrical resistance; Clathrates; Ba8Ga16Ge30; waste heat recovery; semiconductors;

   Sammanfattning : The modern, highly industrialized, society of today requires huge amounts of energy to function. This has resulted in a heavy dependence on the very energy efficient fossil fuels, a source of energy which of course is not infinite and we are slowly approaching the day when oil runs out. LÄS MER

3. 12. Synthesis and Characterization of New Inorganic Thermoelectric Materials

   Författare :Daniel Cederkrantz; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; thermal conductivity.; Ba8Ga16Ge30; Seebeck coefficient; nanoinclusions; Thermoelectricity; waste heat recovery; clathrates; thermal stability; electrical resistance; Mg2Si; substitution; semiconductors;

   Sammanfattning : With thermoelectric materials it is possible to convert a difference in temperature into electrical energy. This can be utilized for a more efficient use of available energy, eg. by converting waste heat from a combustion process. LÄS MER

4. 13. Novel room temperature ferromagnetic semiconductors

   Författare :Amita Gupta; KTH; []
   Nyckelord :;

   Sammanfattning : In today's information world, bits of data are processed bysemiconductor chips, and stored in the magnetic disk drives.But tomorrow's information technology may see magnetism (spin)and semiconductivity (charge) combined in one 'spintronic'device that exploits both charge and 'spin' to carry data (thebest of two worlds). LÄS MER

5. 14. Photoemission From Si(100)/Na,K Metallization, Surface Photovoltage and Quantum Well States

   Författare :Aref H. Hamawi; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; alkali metal adsorption; photoemission; Si 100 ; interface metallization; semiconductors; valence electrons;

   Sammanfattning : Si(100) covered by Na and K has been studied with photoemission using low photon energies (hw.... LÄS MER

7. 15. Characterization of Surfaces Relevant to Nanotechnology

   Författare :Emelie Hilner; Synkrotronljusfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nanotechnology; surface science; semiconductors; scanning tunneling microscopy; spectroscopic photoemission and low energy electron microscopy; low energy electron diffraction;

   Sammanfattning : In this thesis investigations of the structure and dynamics of semiconductor surfaces relevant for the synthesis of nanostructures are presented. The studies were performed using Scanning Tunneling Microscopy (STM), Low Energy Electron Diffraction (LEED), and Spectroscopic PhotoEmission and Low Energy Electron Microcopy (SPELEEM). LÄS MER