Sökning: "band edge position"

Hittade 4 avhandlingar innehållade orden band edge position.

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

    Författare :Jing Wang; Pär Jönsson; Anders Palmqvist; KTH; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  3. 2. Atomic Scale Design of Clean Energy Materials : Efficient Solar Energy Conversion and Gas Sensing

    Författare :Jawad Nisar; Rajeev Ahuja; Puru Jena; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Photocatalysts; Band gap narrowing; Water dissociation; Density functional theory; Gas sensing; Kaolinite; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : The focus of this doctoral thesis is the atomic level design of photocatalysts and gas sensing materials. The band gap narrowing in the metal oxides for the visible-light driven photocatalyst as well as the interaction of water and gas molecules on the reactive surfaces of metal oxides and the electronic structure of kaolinite has been studied by the state-of-art calculations. LÄS MER

  4. 3. ZnO Quantum Dots : Size Dependent Optical, Vibrational and Photoelectrochemical Properties

    Författare :Jesper Jacobsson; Tomas Edvinsson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; ZnO; nanoparticels; quantum dots; Chemistry with specialization in Inorganic Chemistry; Kemi med inriktning mot oorganisk kemi;

    Sammanfattning : This thesis is devoted to quantum dots of ZnO in the size regime 2.5-10 nm.The focus is directed towards their size dependent properties with specialemphasis on the optical, vibrational and photocatalytic properties. The particleswere synthesized by hydrolysis in alkaline zinc acetate solution. LÄS MER

  5. 4. Electronic Structures and Energy Level Alignment in Mesoscopic Solar Cells : A Hard and Soft X-ray Photoelectron Spectroscopy Study

    Författare :Rebecka Lindblad; Håkan Rensmo; Hans Seigbahn; Anders Hagfeldt; Erik Johansson; Marcus Bär; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Photoelectron spectroscopy; HAXPES; PES; XPS; electronic structure; energy level alignment; mesoscopic solar cell; hole conductor; perovskite; dye-sensitized; semiconductor-sensitized; TiO2; ZnO; spiro-OMeTAD; P3HT; DEH; metal sulfide; Li-TFSI; Co III complex; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

    Sammanfattning : Photoelectron spectroscopy is an experimental method to study the electronic structure in matter. In this thesis, a combination of soft and hard X-ray based photoelectron spectroscopy has been used to obtain atomic level understanding of electronic structures and energy level alignments in mesoscopic solar cells. LÄS MER