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S. Barth, F. Biegger:
"Semiconductor Synthesis using Molecular Sources";
Vortrag: Chemiedozententagung 2015, Universität Regensburg, Deutschland; 02.03.2015 - 04.03.2015; in: "Wissenschaftliches Programm und Vorträge", (2015), S. B33.

Metal alkoxides are well-known single-source precursors for the synthesis of the corresponding oxide materials by the molecule-to-material approach via gas phase and solution-based processes. Stability, solubility and vapour pressure are usually tuned by the degree of oligomerisation, which is highly dependent on the steric demand and the ability of forming chelating bonds via donors in the organic backbone (ethers and amines). The materials obtained from these molecular sources are usually simple or complex oxides, independent of the conversion process and the donor-functionalisation.
Interestingly, to the best of our knowledge no thioether-functionalised alkoxides are described in literature. We developed a facile, high-yield synthesis of thioether-functionalised alcohols and their corresponding alkoxides (Ga, In). This precursor bibliography allows us to investigate the coordination behaviour of thioether-donors in alkoxides of the heavier group 13 metals. The new alkoxide derivatives are as moisture sensitive as the non-functionalised counterparts; however, their behaviour in the molecule-to-material conversion differs tremendously. The material synthesis includes chemical vapor deposition as well as thermoylsis in high boiling point solvents and is complemented with sol-gel products for comparison. The materials obtained illustrate the opportunity to include an in-situ formation of sulphide containing oxides or even pure sulphides during the thermolysis of the alkoxides. This is illustrates that there is still some room for modification of alkoxides to tailor the properties of the resulting inorganic materials after processing. In summary, the talk will address the synthesis and thermolysis behaviour of thioether-functionalised alkoxides under different conditions and the investigation of the resulting materials.