Search for dissertations about: "band alignment"

Showing result 1 - 5 of 52 swedish dissertations containing the words band alignment.

  2. 1. Band Alignment Between ZnO-Based and Cu(In,Ga)Se2 Thin Films for High Efficiency Solar Cells

    Author : Charlotte Platzer-Björkman; Lars Stolt; John Kessler; Ayodhya Tiwari; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electronics; solar cells; Cu In Ga Se2; atomic layer deposition; ZnO; Zn O S ; Zn Mg O; band alignment; photoelectron spectroscopy; Elektronik; Electronics; Elektronik;

    Abstract : Thin-film solar cells based on Cu(In,Ga)Se2 contain a thin buffer layer of CdS in their standard configuration. In order to avoid cadmium in the device for environmental reasons, Cd-free alternatives are investigated. READ MORE

  4. 2. Everything is imperfect: Studies on point defects in insulators

    Author : Christopher Linderälv; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; boron nitride; band alignment; oxygen vacancies; insulator; optical lineshape; point defects; density functional theory; wide band gap oxides;

    Abstract : Point defects can be detrimental or absolutely necessary for the performance of a material. Due to the implications defects have on a material, defects have been widely studied over the last century. READ MORE

  5. 3. ALD Buffer Layer Growth and Interface Formation on Cu(In,Ga)Se2 Solar Cell Absorbers

    Author : Jan Sterner; Lars Stolt; Roland Scheer; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electronics; thin film; Cu In; Ga Se2; CIGS; chalcopyrite; ALD; sulfurization; buffer layer; XPS; UPS; electron spectroscopy; band alignment; atomic layer deposition; Elektronik; Electronics; Elektronik;

    Abstract : Cu(In,Ga)Se2 (CIGS) thin film solar cells contain a thin layer of CdS. To avoid toxic heavy-metal-containing waste in the module production the development of a cadmium-free buffer layer is desirable. This thesis considers alternative Cd-free buffer materials deposited by Atomic Layer Deposition (ALD). READ MORE

  6. 4. Electronic Properties of Metal Oxide Films Studied by Core Level Spectroscopy

    Author : Jan Hinnerk Richter; Anders Sandell; Håkan Rensmo; Anne Borg; Uppsala universitet; []
    Keywords : Physics; electron spectroscopy; metal oxide; chemical vapour deposition; ion insertion; metal organic; band alignment; zirconium; titanium; silicon; high k; Fysik;

    Abstract : In this dissertation core level electron spectroscopy has been employed to study various aspects of metal oxide films grown under ultra-high vacuum conditions. Studies on in situ ion insertion of lithium into thin TiO2 systems were performed. READ MORE

  7. 5. Development of Graphitic Carbon Nitride based Semiconductor Photocatalysts for Organic Pollutant Degradation

    Author : Jing Wang; Pär Jönsson; Anders Palmqvist; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; graphitic carbon nitride; visible light-driven photocatalyst; staggered band alignment; electron-hole pair separation; band edge position; Materials Science and Engineering; Teknisk materialvetenskap;

    Abstract : As a potential solution to the global energy and environmental pollution, design and synthesis of artificial photocatalysts with high activities have attracted increasing scientific interests worldwide. In recent years, the graphitic carbon nitride (g-C3N4) has shown new possible applications in the photocatalytic field due to its unique properties. READ MORE