Sökning: "Metal doped semiconductors"

Visar resultat 1 - 5 av 24 avhandlingar innehållade orden Metal doped semiconductors.

1. 1. Cluster model of disordered systems : application to doped semiconductors and a simple model polymer

   Författare :Rolf G. Riklund; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : In this thesis we study with an extended cluster model calculation the combined effect of disorder and electron-electron interaction on the electronic structure of doped semiconductors and a simple model polymer chain. First a one-band model using a Hartree calculation is compared to other authors result for the impurity band using less realistic Hamiltonians. LÄS MER

3. 2. Low Temperature Structural and Property investigations in the Zn-Sb System

   Författare :Johanna Nylén; Sven Lidin; Jeff Snyder; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Thermoelectrics; Zinc antimmonides; Metal doped semiconductors; Chemistry; Kemi; oorganisk kemi; Inorganic Chemistry;

   Sammanfattning : Thermoelectric Zn4Sb3 has a randomly disordered crystal structure at room temperature and undergoes a reversible sequence of phase transitions, β-α-α’/α, at low temperatures. During the transformations interstitial Zn atoms and Zn vacancies present in the β-phase become increasingly ordered. LÄS MER

4. 3. Computational Material Design : Diluted Magnetic Semiconductors for Spintronics

   Författare :Lunmei Huang; Rajeev Ahuja; Walter Temmerman; Uppsala universitet; []
   Nyckelord :Physics; Density functional theory; Diluted magnetic semiconductor; Ferromagnetism; Defect; Phase transition; High pressure; Thermal elastic constant; Fysik;

   Sammanfattning : The present thesis deals with the application of ab-initio electronic structure calculations based on density functional theory for material design.The correlation between magnetic properties and electronic structures has been investigated in detail for diluted magnetic semiconductors (DMS), which have promising application for spintronics devices. LÄS MER

5. 4. Image dipoles and polarons in organic semiconductors

   Författare :Yongzhen Chen; Mats Fahlman; Xianjie Liu; Yiqiang Zhan; Linköpings universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic electronics; Interface dipole; Polaron; Conjugated polymer; Photoelectron spectroscopy; N-type doping; Electron transport material;

   Sammanfattning : The rapid development of organic electronics depends on the synthesis of new π-conjugated molecules/polymers and the exploration of fundamental physics. However, most of the efforts have been concentrated on the former, leading to a lack of thorough understanding of many important concepts, which will become the ultimate limiting factor for overall performance and applications. LÄS MER

7. 5. New Materials for Spintronics : Electronic structure and magnetism

   Författare :Ronny Knut; Olof Karis; Biplab Sanyal; Hermann Durr; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spintronics; X-ray photoemission; XPS; XMCD; XAS; magnetic semiconductors; HIKE; HAXPES; multilayer; monte carlo; magnetism; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : Materials exhibiting new functionalities due to interdependent electric (e.g. conductivity) and magnetic properties are potentially interesting for spintronics applications. LÄS MER