Synthesis and surface characterization of semiconductor nanocrystals for photovoltaic application [Elektronische Ressource] / von Irina Lokteva

Synthesis and Surface Characterization ofSemiconductor Nanocrystals forPhotovoltaic ApplicationVon der Fakultat fur Mathematik und Naturwissenschaftender Carl von Ossietzky Universitat Oldenburgzur Erlangung des Grades und Titels einesDoktors der Naturwissenschaften (Dr. rer. nat.)angenommene DissertationvonFrau Dipl.-Chem. Irina Loktevageboren am 27.08.1985in Woronesch, RusslandErstgutachter: Jun.-Prof. Dr. Joanna Kolny-OlesiakZweitgutachter: Prof. Dr. Jurgen ParisiTag der Disputation: 30.06.2010iiiAbstractIn the rst part of the thesis, the kinetics of a novel colloidal synthesis of nearly0monodisperse CdSe and CdS QDs involving in situ formed Cd particles was stud-ied. Reactions with di erent types of Se and S precursors, Cd to Se and S ratio, anddi erent amount of the stabilizer (oleic acid) were characterized by UV-Vis absorp-tion spectroscopy. The Cd and Se/S precursor solutions were investigated by means1 13of atomic absorption spectroscopy (AAS) as well as H and C nuclear magneticresonance (NMR) spectroscopy and mass-spectrometry (MS). Transmission electronmicroscopy (TEM) was used to determine the size distribution of as-synthesized CdSeand CdS NCs. Formation of magic-sized nanoclusters (MSNCs) during the synthesis(at the early stages of the reactions) and storage of CdS QDs was observed.In the second part, a surface modi cation of originally oleic acid-capped CdSe QDswith pyridine molecules was carried out.