Search for dissertations about: "donor energies"

Showing result 1 - 5 of 11 swedish dissertations containing the words donor energies.

  1. 1. Resonant states in modulation-doped heterostructures

    University dissertation from Anders Blom, Sölvegatan 14 A, S-223 62 Lund, Sweden

    Author : Anders Blom; Lund University.; Lunds universitet.; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematical and general theoretical physics; generation-recombination noise; THz laser; classical mechanics; relativity; quantum mechanics; statistisk fysik; gravitation; relativitet; kvantmekanik; klassisk mekanik; Matematisk och allmän teoretisk fysik; thermodynamics; termodynamik; statistical physics; donor energies; Si SiGe quantum well; central-cell effect; impurity absorption; Fysicumarkivet A:2003:Blom; Resonant states; impurity levels;

    Abstract : This thesis deals with the properties of donors placed inside or outside a heterostructure quantum well (QW). The focus of the investigation has been on the formation of resonant states, which are a hybridization of the discrete localized impurity levels and the continuous two-dimensional QW subbands. READ MORE

  2. 2. Atomic Scale Modelling in Photoelectrocatalysis Towards the Development of Efficient Materials for Solar Fuel Production

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Giane B. Damas; Uppsala universitet.; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Photocatalytic hydrogen production; polymeric materials; donor-acceptor architecture; small molecules; density functional theory; hydrogen binding free energies; exciton binding energies; electrocatalysis; carbon dioxide conversion; formic acid production; Sn-based electrodes; Tin oxides; Ru-complexes; Metal Organic Frameworks; carbon dioxide capture.;

    Abstract : Using sunlight to produce valuable chemicals has been pointed out as an interesting alternative to deal with the well-known environmental problem related to the use of fossil fuels for energy generation. Thus, it is crucial for this field the development of novel photocatalysts that could drive the uphill reactions with high efficiency while presenting low price and toxicity. READ MORE

  3. 3. Influence of Bridge Structures on the Electron Transfer in Donor-Acceptor Systems

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Mikael Winters; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; molecular wire; electron transfer; porphyrin; conjugated oligomer;

    Abstract : In this Thesis, porphyrin-based donor-acceptor systems have been used to study photoinduced electron transfer processes. Principally, two different sets of systems have been investigated. READ MORE

  4. 4. Ground and Excited State Aromaticity Design Tools for π-Conjugated Functional Molecules and Materials

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Christian Dahlstrand; Uppsala universitet.; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; fulvene; fulvalene; polyfulvene; aromaticity; triplet state; excited state; Clar structure; polybenzenoid hydrocarbons PBH ; conjugated polymers; computational chemistry; optical spectroscopy; Chemistry with specialization in Organic Chemistry; Kemi med inriktning mot organisk kemi;

    Abstract : The main focus of this thesis is on the aromaticity of the ground state and electronically excited states of π-conjugated molecules and polymers, as well as how aromaticity is connected to their properties.The electronic structures of polybenzenoid hydrocarbons (PBHs) were explored through density functional theory (DFT) calculations and the π-component of the electron localization function (ELFπ). READ MORE

  5. 5. Optical properties of some complex defects in silicon

    University dissertation from Linköping, Sweden : Department of Physics and Measurement Technology

    Author : Johan Svensson; Linköpings universitet.; Linköpings universitet.; [1990]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : lnfrared absorption spectroscopy has been used study transitions between electronic states related to some complex defects in silicon. Three different defects have been studied: a complex defect involving carbon as one of its constituents, a divacancy, and a defect found in silicon containing tin. READ MORE