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concerned with the synthesis and characterization of suited inorganic compounds. Such materials are used as wavelength converters in fluorescent lamps and in scintillating and information storing crystals. Present work is focused on x-ray detection materials, which exhibit needle-like growth, needed for improved resolution in medical imaging. In particular cesium halides-based storage phosphors and scintillators are under investigation. Further research is concentrated on the low radiation hardness of CsBr:Eu 2+ . Radiation-induced defects like color centers and precipitations are studied by means of spectroscopic methods, electron microscopy and structural analysis. In the field of storage phosphors also BaFBr:Eu 2+ used in commercial image plates is investigated. On the one hand the mechanism of PSL-sensitization should be clarified. On the other hand the production of foils and glass ceramics including BaFBr:Eu 2+ is in the focus of the work. Another topic is radiation scintillators, which convert x-ray energy immediately into visible light, then detected by a CCD-array. For dynamical imaging in computer tomography (CT) a fast decay of the emitted light is required. Therefore investigations are focused on the mechanisms which influence the lifetime of the light emitting activator transitions. Furthermore general challenges are the sensitization of such phosphors in respect to the radiation energy, which can range from ultraviolet over hard γ-rays to thermal neutrons. Staff Members Head Prof. Dr. Heinz von Seggern Research Associate Dr. Kinga Horvath Dr. Christian Melzer Dr. Sergey V. Yampolskii Technical Personnel Secretary PhD Students Diploma Students Gabriele Andreß Sabine Hesse Gerlinde Dietrich Dipl.-Ing. Niels Benson Dipl.-Ing. Arne Fleissner Dipl.-Ing. Andrea Gassmann Dipl.-Phys. Oliver Karg Dipl.-Phys. Frederik Neumann Dennis Braun Andrea Gassmann Urs Krämer Tobias Lang Humboldt-fellow Dr. Graham Appleby Guest Scientist Prof. Dr. Sergei Fedosov Prof. Dr. Robert Fleming Dipl.-Phys. Xianguo Meng - 20 - Dr. Sergej Zhukov Dr. Jörg Zimmermann Bernd Stoll Dipl.-Phys. Ulrich Niedermeier Dipl.-Phys. Oliver Ottinger Dipl.-Ing. Martin Schidleja Dipl.-Ing. Christopher Siol Dipl.-Ing. Oliver Weiß Martin Schidleja Hanna R. Schmid Hans Schmidt
Research Projects Fatigue of organic semiconductor components. (SFB (DFG), 2003-2006) Phenomenological modelling of bipolar carrier transport in organic semiconducting devices under special consideration of injection, transport and recombination phenomena. (SFB (DFG), 2003-2006) Investigation of fast scintillators with high efficiency for medical applications. (Siemens AG, prolonged 2004-2006) Piezoelectric sensor materials based on porous polymers. (BMWA-AiF 2005 – 2007) Investigation of poled fluoropolymer membranes by means of surface corona treatment. (Gore & Associates, 2003 – 2006) Polymer Electronics: Investigation of functional instabilities of polymers and small molecule based field effect transistors. (BMBF-DLR 2005 – 2008) Investigation of the operation principle and optimisation of organic light emitting field effect transistors. (DFG 2005 – 2007) Self-organisation, orientation and electronic properties of organic thin films based on low molecular weight, oligomeric and polymeric materials at the interface in field effect transistors. (SPP (DFG) prolonged 2005 – 2007) Charge carrier injection and transport in doped organic light emitting diodes. (BMBF- OSRAM OS 2006 - 2009) - 21 -
Page 1: ANNUAL REPORT 2 0 0 6 FACULTY OF MA
Page 4 and 5: Annual Report 2006 Faculty 11 Mater
Page 6 and 7: Preface The year 2006 of the Depart
Page 8 and 9: difference of numerical and analyti
Page 10 and 11: Institute of Materials Science Phys
Page 12 and 13: Research Projects Bulk Amorphous Al
Page 14 and 15: el Dsoki, C.; Landersheim, V. ; Kau
Page 16 and 17: Das, J.; Kim, K. B.; Xu, W.; Wei, B
Page 18 and 19: Staff Members Head Prof. Dr. Jürge
Page 20 and 21: Zhou L.; Rixecker G.; Aldinger F.;
Page 24 and 25: Publications Fleissner, A.; Schmid,
Page 26 and 27: • Surface analysis The UHV-surfac
Page 28 and 29: T. Mayer, U. Weiler, E. Mankel and
Page 30 and 31: Thin films The Thin Film division w
Page 32 and 33: Berky, W.; Gottschalk, S.; Elliman,
Page 34 and 35: Guest Scientists Research Projects
Page 36 and 37: Hesse, S.; Zimmermann, J.; von Segg
Page 38 and 39: Structure Research The research in
Page 40 and 41: Research Projects Functional Advanc
Page 42 and 43: Dincer, I.; Elerman, Y.; Elmali, A;
Page 44 and 45: hexakis(imidazole)nickel(II)bis(for
Page 46 and 47: Chemical Analytics The chemical ana
Page 48 and 49: Collaborations The above mentioned
Page 50 and 51: Hoffmann, P.; Non-Invasive Identifi
Page 52 and 53: Ferroelectrics For this class of ma
Page 54 and 55: Materials Modelling The research ac
Page 56 and 57: Materials for Renewable Energies In
Page 58 and 59: Joint Research Laboratory Nanomater
Page 60 and 61: Collaborative Research Center (SFB)
Page 62 and 63: B7 P.I.: Prof. H. v. Seggern / Dr.
Page 64 and 65: The glass transition temperature (T
Page 66 and 67: transition allows to investigate at
Page 68 and 69: Relative density 1.00 0.95 0.90 0.8
Page 70 and 71: Fig. 2 shows the time dependencies
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Dielectric interface trap engineeri
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∆V C q th eff 12 −2 p ( VGS = 0
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Fig. 3: Schematic of the photovolta
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synthesis and analysis of interface
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Fig. 2: Resistivity vs temperature
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Fig. 2: X-ray appearance near-edge
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Capacity [mAhg -1 ] 700 600 500 400
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Texture investigations and field em
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screening effects. Gold coating of
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Figure 2 shows a selected region of
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The spectrum shows that apart from
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The effect of crystallinity on the
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Electrochemical investigation and c
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This phenomenon can be understood c
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∆ = 0 − exhibiting dominance of
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constituents. The requirement of va
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In order to assess the influence of
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In this study, we have therefore de
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Fig. 1: Proposed models for a) Pt,
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Synthesis of oxide-polymer nanocomp
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Diploma Theses Böhme, Mario; Herst
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Sperling, Sebastian; Untersuchungen
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Institute of Applied Geosiences Phy
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Research Projects Geomorphology and
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Engineering Geology Engineering Geo
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Investigation of a Doline in NE-Hes
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Applied Sedimentology Sedimentary r
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econstruction.(Diploma thesis in co
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Darmstadt University of Technology
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Geomaterials Science Geomaterial Sc
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Gregori, G.; Kleebe H.-J.; Sorarù,
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Hessische Industriemüll GmbH). Due
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Technical Personnel Josef Kolb, Dip
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Research Projects Environmental sca
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Fig. 1: Aerial photo of the Lake Li
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Lithological Map of the Japanese Ar
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tower stripping, and therefore much
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Diffusion and reaction in micro- an
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Rift dynamics, uplift and climate c
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Geology, land use change and erosio
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nearly half a century has been perf
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The Effect of LiF Addition on the S
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In case of the undoped sintered B6O
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Microstructures in Omphacite and Ot
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Modelling phase-assemblage diagrams
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As an example, Fig. 2 shows the che
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MATERIALS SCIENCE Physical Metallur
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