Sökning: "bromine"

Visar resultat 16 - 20 av 41 avhandlingar innehållade ordet bromine.

  1. 16. In pursuit of next generation photovoltaics : An electronic structure study of lead-free perovskite solar cells

    Författare :Axel Erbing; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; teoretisk fysik; Theoretical Physics;

    Sammanfattning : The recent development of perovskite-based solar cells have shown a remarkably fast increase in power conversion efficiency making them a promising low-cost alternative to conventional cells. The most successful class of materials however, the lead-halide perovskites, are held back due to toxicity and stability issues significantly limiting their use. LÄS MER

  3. 17. Transition metal oxofluorides comprising lone pair elements : Synthesis and Characterization

    Författare :Shichao Hu; Mats Johnsson; Jürgen Köhler; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; lone pairs; oxofluorides; low-dimensional compounds; Inorganic Chemistry; oorganisk kemi;

    Sammanfattning : Within the family of transition metal oxochlorides/bromides containing lone pair elements, the transition metal cations often adopt a low-dimensional arrangement such as 2D layers, 1D chains or 0D clusters. The reduced dimensionality is attributed to the presence of stereochemically active lone pairs which are positioned in the non-bonding orbital and will not participate in bond formation and instead act as structural spacers that help to separate coordination polyhedra around transition metal cations from forming three dimensional networks. LÄS MER

  4. 18. Halogenated organic matter in precipitation

    Författare :Krzysztof Laniewski; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : Deposition in rain and snow plays a crucial role in the regional and global redistribution of a great variety of substances. This thesis is devoted to chemical characterisation and identification of the halogenated organic compounds that are most widespread in rain and snow. LÄS MER

  5. 19. Structural chemistry and optical application

    Författare :Mohamed I D M Ghazzali; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; conjugated polymers; single crystal x-ray diffraction; porphyrins; NLO-materials;

    Sammanfattning : The demand for materials with optical activities against LASER radiation has been extensively increased over the last decade with the development of sophisticated high energetic LASER sources. The goal is to obtain organic or metal-organic molecules capable of increasing their absorptions against LASER irradiance while still maintaining a degree of transmittance. LÄS MER

  7. 20. Development of positron emission tomography radioligands for the dopaminergic and serotonergic neurotransmission systems

    Författare :Camilla Lundkvist; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :PET; Radioligand; Dopamine transporter; Serotonin transporter; 5-HT1A receptor; 5-HT2A receptor;

    Sammanfattning : The dopaminergic and serotonergic neurotransmission systems are of central interest in relation to several neuropsychiatric disorders. The main objectives were to develop new suitable radioligands for positron emission tomography (PET) examinations of the dopamine transporter (DAT) as well as the serotonin 5-HT1A and 5-HT2A-receptors. LÄS MER