Search for dissertations about: "diffusion dopant"

Showing result 1 - 5 of 15 swedish dissertations containing the words diffusion dopant.

  2. 1. Dopant diffusion in Si and SiGe

    Author : Jens S. Christensen; KTH; []
    Keywords : condensed matter;

    Abstract : Dopant diffusion in semiconductors is an interestingphenomenon from both technological and scientific points ofview. Firstly, dopant diffusion is taking place during most ofthe steps in electronic device fabrication and, secondly,diffusion is related to fundamental properties of thesemiconductor, often controlled by intrinsic point defects:self-interstitials and vacancies. READ MORE

  4. 2. From the Electronic Structure of Point Defects to Functional Properties of Metals and Ceramics

    Author : David Andersson; Börje Johansson; Pavel Korzhavyi; Benjamin Burton; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; first principles; ab initio; density functional theory; Calphad; point defects; diffusion; solid electrolytes; oxygen storage materials; Material physics with surface physics; Materialfysik med ytfysik;

    Abstract : Point defects are an inherent part of crystalline materials and they influence important physical and chemical properties, such as diffusion, hardness, catalytic activity and phase stability. Increased understanding of point defects enables us to tailor the defect-related properties to the application at hand. READ MORE

  5. 3. Quantum aspects of hydrogen in metals and oxides from density-functional calculations

    Author : Per G. Sundell; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; diffusion; density functional theory; hydrogen; quantum tunneling; electronic structure; perovskite oxide; metal; first-principles; DFT.; ab-initio;

    Abstract : Atomic hydrogen dissolved in a solid or adsorbed on a solid surfacedisplays many remarkable features, and is a subject ofgreat technological interest.An increased understanding of hydrogen/solid systems can supportthe development of areas as diverse asproton exchange membranes for fuel cells,heterogeneous catalysis, and growth of semiconductor devices. READ MORE

  6. 4. First-principles studies of kinetic effects in energy-related materials

    Author : Johan O. Nilsson; Natalia Skorodumova; Aatto Laaksonen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials Science and Engineering; Teknisk materialvetenskap;

    Abstract : Quantum mechanical calculations based on first-principles (lat. ab initio) methods have over the past decades proved very successful for the study of many materials properties. READ MORE

  7. 5. Neutron scattering for sustainable energy materials: investigations of proton dynamics in acceptor doped barium zirconates

    Author : Daria Noferini; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; neutron scattering; fuel cells; QENS; Proton conductors; perovskites; proton dynamics; energy materials;

    Abstract : Proton conducting oxides are currently receiving considerable attention for their present or potential use as electrolytes in technological devices such as sensors and electrolysers and, in particular, solid oxide fuel cells, which are among the most promising apparatuses for energy conversion. One of the main challenges for these latter devices is to combine the advantages of a solid electrolyte with those of operational temperatures below 750 °C, which is currently hampered by insufficient conductivities in the targeted temperature range. READ MORE