Sökning: "Vanya Darakchieva"

Visar resultat 1 - 5 av 16 avhandlingar innehållade orden Vanya Darakchieva.

  1. 1. Strain-related structural and vibrational properties of group-III nitride layers and superlattices

    Författare :Vanya Darakchieva; Oliver Ambacher; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This PhD thesis is focused on strain-related phenomena in group-III nitride layers and heterostructures. Key issues in material properties as phonon mode behavior, structure and lattice parameters of AlN, InN and GaN, as well as of AlN/GaN superlattices are addressed in order to give answers to some open questions. LÄS MER

  3. 2. Free charge carrier properties in group III nitrides and graphene studied by THz-to-MIR ellipsometry and optical Hall effect

    Författare :Nerijus Armakavicius; Vanya Darakchieva; Philipp Kühne; Stefan Zollner; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Development of silicon based electronics have revolutionized our every day life during the last five decades. Nowadays silicon based devices operate close to their theoretical limits that is becoming a bottleneck for further progress. LÄS MER

  4. 3. Study of novel electronic materials by mid-infrared and terahertz optical Hall effect

    Författare :Nerijus Armakavicius; Vanya Darakchieva; Philipp Kühne; Mircea Modreanu; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Development of silicon based electronics have revolutionized our every day life during the last three decades. Nowadays Si based devices operate close to their theoretical limits that is becoming a bottleneck for further progress. LÄS MER

  5. 4. Structural and Electronic Properties of Graphene on 4H- and 3C-SiC

    Författare :Chamseddine Bouhafs; Vanya Darakchieva; Rozitsa Yakimova; Ivan Gueorguiev Ivanov; Jacek Baranowski; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Graphene is a one-atom-tick carbon layer arranged in a honeycomb lattice. Graphene was first experimentally demonstrated by Andre Geim and Konstantin Novoselov in 2004 using mechanical exfoliation of highly oriented pyrolytic graphite (exfoliated graphene flakes), for which they received the Nobel Prize in Physics in 2010. LÄS MER

  7. 5. Optics of Conducting Polymer Thin Films and Nanostructures

    Författare :Shangzhi Chen; Magnus Jonsson; Vanya Darakchieva; William Barnes; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Intrinsically conducting polymers forms a category of doped conjugated polymers that can conduct electricity. Since their discovery in the late 1970s, they have been widely applied in many fields, ranging from optoelectronic devices to biosensors. The most common type of conducting polymers is poly(3,4-ethylenedioxythiophene), or PEDOT. LÄS MER