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591 Publications
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  • Optimization of PECVD process for ultra thin tunnel SiOx film as passivation layer for silicon heterojunction solar cells

    Mazzarella, L.; Kolb, S.; Kirner, S.; Calnan, S.; Korte, L.; Stannowski, B.; Rech, B.; Schlatmann, R (2016)
    Ultra thin silicon oxide a SiOx H films have been grown by means of plasma enhanced chemical vapor deposition PECVD to replace the standard hydrogenated amorphous silicon a Si H passivation layer for silicon heterojunction solar cells to reduce parasitic absorption. Additionally, silicon oxide surfaces are well known as superior substrates for the nucleation enhancement for nanocrystalline silicon doped films. Symmetrical passivation samples were fabricated with variable a SiOx ...

    Assistance of the Iron Porphyrin Ligands to the Binding Interaction between the Fe Center and Small Molecules in Solution

    Xiao, J.; Golnak, R.; Atak, K.; Pflüger, M.; Pohl, M.; Suljoti, E.; Winter, B.; Aziz, E (2014)

    Interface reactions and Kirkendall voids in metal organic vapor phase epitaxy grown Cu In,Ga Se2 thin films on GaAs

    Lei, C.H.; Rockett, A.A.; Robertson, I.M.; Papathanasiou N.; Siebentritt, S (2006)
    Cu In1 xGax Se2 CIGS films were grown on 001 GaAs at 570 C or 500 C by means of metalorganic vapor phase epitaxy. All films were Cu rich [Cu In Ga gt;1] with pseudomorphic Cu2Se second phases found only on the growth surface. During growth, diffusion of Ga from the substrate and vacancies generated by the formation of CIGS from Cu2Se at the surface occurred. The diffusion processes lead to the formation of Kirkendal voids at the GaAs CIGS interface. Transmission electron microscopy...

    In situ SyXRD Analysis of Cement Hydration on the ms Scale

    Schlegel, M. C.; Sarfaz, A.; Müller, U.; Panne, U.; Emmerling, F (2013)
    The backbone of our infrastructure and modern architecture are cementitious materials. Despite their substantial role for the society and their common involvement in the built environment, basic aspects of the hydration processes of cement are still not understood. During the first seconds of a building s life, highly dynamic reaction processes prevail. The reactions have a direct influence on the properties of the final building. Typically, these reactions are actively influenced by organic ...

    Time resolved X ray absorption spectroscopy of infrared laser induced temperature jumps in liquid water

    Gavrila, G.; Godehusen, K.; Weniger, C.; Nibbering, E.T.J.; Elsaesser, T.; Eberhardt, W.; Wernet, P (2009)
    A time resolved X ray absorption study of the structural dynamics of liquid water on a picosecond timescale is presented. We apply femtosecond midinfrared pulses to resonantly excite the intramolecular O H stretching band of liquid water and monitor the transient response in the oxygen K edge absorption spectrum with picosecond X ray pulses. In this way, structural changes in the hydrogen bond network of liquid water upon an ultrafast temperature jump of approximately 20 K are investi...
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