Search for dissertations about: "conduction band shift"

Showing result 1 - 5 of 12 swedish dissertations containing the words conduction band shift.

  2. 1. Photoelectrochemical studies of dye-sensitized solar cells using organic dyes

    Author : Tannia Marinado; Anders Hagfeldt; Katoh Ryuzi; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; additive; charge recombination; coadsorbent; conduction band shift; dye-sensitized; electron lifetime; electron-transfer; organic dye; photoelectrochemical; photovoltaic; sensitizer; semiconductor; solar cell; solar cell efficiency; titanium dioxide; Physical chemistry; Fysikalisk kemi;

    Abstract : The dye-sensitized solar cell (DSC) is a promising efficient low-cost molecular photovoltaic device. One of the key components in DSCs is the dye, as it is responsible for the capture of sunlight. State-of-the-art DSC devices, based on ruthenium dyes, show record efficiencies of 10-12 %. READ MORE

  4. 2. 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

  5. 3. Chemistry and Physics of Cu and H2O on ZnO Surfaces : Electron Transfer, Surface Triangles, and Theory

    Author : Matti Hellström; Kersti Hermansson; Peter Broqvist; Daniel Spångbeg; Jörg Behler; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; catalysis; density functional theory; SCC-DFTB; band-filling correction;

    Abstract : This thesis discusses the chemistry and physics of Cu and H2O on ZnO surfaces, based primarily on results from quantum chemical calculations. The underlying context is heterogeneous catalysis, where Cu/ZnO-mixtures are used in the industrial synthesis of methanol and in the water gas shift reaction. READ MORE

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

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

    Abstract : 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. READ MORE

  7. 5. Spectroscopic studies of doped GaAs/ AlGaAs quantum wells in the high carrier density regime

    Author : Somrit Wongmanerod; Bernard GIL; Linköpings universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : This thesis is mainly based on experimental and theoretical investigations of the electronic structures and optical properties of p-type doped GaAs/AlGaAs quantum wells using a combination of photoluminescence and magneto-optical spectroscopy in the presence of high magnetic fields.The effects of high hole densities up to 3. READ MORE