Sökning: "Band-gap"

Visar resultat 1 - 5 av 190 avhandlingar innehållade ordet Band-gap.

  1. 1. Optical characterization of wide band gap materials by spectroscopic ellipsometry

    Författare :O. P. Alexander Lindquist; Linköpings universitet; []
    Nyckelord :Wide Band Gap materials; ellipsometry; SiC; GaN;

    Sammanfattning : Spectroscopic ellipsometry has been employed in the study of wide band gap materials. Ellipsometry is based on the study of changes in the polarization state of light upon reflection on a surface. LÄS MER

  3. 2. Low Band-Gap Conjugated Polymers for Plastic Solar Cells

    Författare :Erik Per Perzon; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; low band-gap conjugated polymers; Plastic solar cells;

    Sammanfattning : Today, fossil fuels like coal, oil, and natural gas are used for more than 60% of the world's electricity production. These fuels have a very negative impact on the environment and many researchers agree that the earth's climate is changing as a consequence of fossil fuel emissions. LÄS MER

  4. 3. Magnetism in Band Gap Engineered Sputtered MgxZn(1-x)O Thin Films

    Författare :Sreekanth Mahadeva; K Venkat Rao; Lyubov Belova; Mark Fox; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Magnetron co-sputtering; MgO; MgxZn 1-x O; MnxMg 1-x O; thin films; Room-temperature ferromagnetism; band gap engineering; and intrinsic defects;

    Sammanfattning : This dissertation presents a comprehensive study of the intrinsic room temperature ferromagnetism, RTFM, in technologically important thin films of ZnO, MgO, Mg@ZnO, the so-called d0–magnets that do not contain any intrinsic magnetic elements. We also present the first report on magnetism in Mn doped MgO films fabricated by dc magnetron sputtering. LÄS MER

  5. 4. Low band-gap polyfluorenes for plastic solar cells

    Författare :Erik Per Perzon; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : .... LÄS MER

  7. 5. Band gap engineering in Cu2ZnGexSn1-xS4 thin film solar cells

    Författare :Nishant Saini; Charlotte Platzer-Bjorkman; Jes K Larsen; Edgardo Saucedo; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CZTS; CZGTS; bandgap grading; ZTO; KCN-etching; titanium nitride; solar cell; Teknisk fysik med inriktning mot elektronik; Engineering Science with specialization in Electronics;

    Sammanfattning : Photovoltaics based on kesterite Cu2ZnSnS4 (CZTS) has attracted interest as a sustainable alternative to other thin film technologies due to their tunable material properties and earth-abundance. However, the efficiency is limited to 12. LÄS MER