Sökning: "NATURAL SCIENCES Physics Condensed matter physics Semiconductor physics"

Visar resultat 21 - 25 av 184 avhandlingar innehållade orden NATURAL SCIENCES Physics Condensed matter physics Semiconductor physics.

1. 21. Initial stages of metal- and organic-semiconductor interface formation

   Författare :Pål Palmgren; Mats Göthelid; Mikael Grehk; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Semiconductor physics; Halvledarfysik;

   Sammanfattning : This licentiate thesis deals with the electronic and geometrical properties of metal-semiconductor and organic-semiconductor interfaces investigated by photoelectron spectroscopy and scanning tunneling microscopy. First in line is the Co-InAs interface (metal-semiconductor) where it is found that Co is reactive and upon adsorption and thermal treatment it alloys with the indium of the substrate to form metallic islands, about 20 nm in diameter. LÄS MER

3. 22. Semiconductor Nanoelectronic Devices Based on Ballistic and Quantum Effects

   Författare :Jie Sun; Fasta tillståndets fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Semiconductor; Quantum Dots; Ballistic Transport; InGaAs InP 2DEG; Nanoelectronics;

   Sammanfattning : As current silicon-based microelectronic devices and circuits are approaching their fundamental limits, the research field of nanoelectronics is emerging worldwide. With this background, the present thesis focuses on semiconductor nanoelectronic devices based on ballistic and quantum effects. The main material studied was a modulation doped In0. LÄS MER

4. 23. Vertical III-V Semiconductor Devices

   Författare :Tomas Bryllert; Fasta tillståndets fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Halvledarfysik; Semiconductory physics; heterostructure barrier varactor frequency multiplier; field effect transistor; resonant tunneling; artificial molecule; terahertz; nanowire; Quantum dots;

   Sammanfattning : This thesis is based on three projects that deal with vertical III-V semiconductor devices. The work spans over basic research as well as more applied aspects of III-V semiconductor technology. All projects have in common that they rely on advanced epitaxial growth to form the starting material for device fabrication. LÄS MER

5. 24. Optical Characterization of III-Nitride and II-V Semiconductor Nanowires

   Författare :David Lindgren; Fasta tillståndets fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; III-Nitride; III-V; Fysicumarkivet A:2014:Lindgren; Semiconductor; Nanowire; Photoluminescence; Cathodoluminescence;

   Sammanfattning : The optical properties of III-V semiconductor nanowires for optical devices have been investigated by photoluminescence spectroscopy, cathodoluminescence spectroscopy and cathodoluminescence imaging. The material systems that have been studied include the nitrides (InN, GaN and AlN) and ternaries, and a few common phosphides and arsenides. LÄS MER

7. 25. Doping of Semiconductor Nanowires

   Författare :Jesper Wallentin; Fasta tillståndets fysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; metal-organic vapour phase epitaxy; III-V semiconductor materials; nanowires; doping; solar cells; F:2013:Wallentin;

   Sammanfattning : In this thesis, in situ doping during growth of III-V semiconductor nanowires, primarily for photovoltaic applications, is investigated. The nanowires were grown by metalorganic vapor phase epitaxy (MOVPE), with gold seed particles. LÄS MER