Electronic Material Properties - und Geowissenschaften ...

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Zhou L.; Rixecker G.; Aldinger F.; Zuo R.; Zhao Z.; Electric Fatigue in Ferroelectric Lead Zirconate Stannate Titanate Ceramics Prepared by Spark Plasma Sintering; J. Am. Ceram. Soc., 89 [12] (2006) 3868. Balke N.; Lupascu D. C.; Blair T.; Gruverman A.; Thickness profile through fatigued bulk ceramic lead zirconate titanate; J. Appl. Phys.,100 (2006) 114117. Ollagnier J.-B.; Guillon O.; Rödel J.; Viscosity of LTCC Determined by Discontinuous Sinter-Forging; Int. J. Appl. Ceram. Technol., 3 [6] (2006) 437. Granzow, T.; Suvaci E.; Kungl H.; Hoffmann J.; Deaging of heat-treated iron-doped lead zirconate titanate ceramics; Appl. Phys. Lett., 89 (2006) 262908. - 18 -
Electronic Material Properties The department Electronic Materials introduces the aspect of electric functional materials and their properties into the Institute of Materials Science. The associated research concentrates on the characterization of various classes of materials suited for implementation in information storage and organic electronics. Three major research topics are presently addressed: � Electronic and optoelectronic properties of organic semiconductors. � Charge transport and polarization in organic dielectrics. � Photo- and photostimulated luminescence in inorganic phosphors. A worldwide interest exists in the use of organic semiconductors in electronic and optoelectronic components, such as transistors and organic light emitting diodes, for novel areas of application. So far, multicolor organic displays have been implemented in commercially available cameras, car-radios, PDAs and mp3-players. Organic devices reaching further into the future might be simple logic circuits, constituting the core of communication electronics such as chip cards for radio frequency identification (RFID) tags and maybe one day flexible electronic newspapers where the information is continuously renewed via local area networks (LAN). In view of the mandatory technological development, the activities of the group are concerned with the characterization of organic material properties regarding the performance of organic electronic and optoelectronic devices. The major aspect deals with the charge carrier injection and transport taking place in organic field-effect-transistors and light emitting diodes. In particular the impact of electronic properties of the insulator / semiconductor interface on the performance of organic field-effect-transistors was subject of recent investigations. This research is of great technological importance, since it opens the field of complementary metal oxide semiconductor (CMOS) technology to organic semiconductors. A further matter of research activities deals with the stability of organic light emitting diodes. With the intention to enhance the device stability and performance, the influence of the device operation on the device life-time in conjunction with material and device specific properties is in the focus of interest. To conduct these demanding tasks, various experimental techniques for device fabrication and characterization are installed. Beside basic electric measurement setups, a laser spectroscopy setup, used for time-of-flight as well as a life-time measurements, and a Kelvin-probe atomic force microscope (AFM) to visualize the potential distribution of organic devices with nanometer resolution are available. In the field of polymer electrets present research comprises the characterization of surface charge distribution, charge stability, and charge transport properties of fluoropolymers, as well as their applications in acoustical transducers. Present investigations of charge transport and polarization in organic dielectrics are directed towards the basic understanding of polarization buildup and stabilization in PVDF and novel microporous dielectrics, which are scientifically interesting as model ferroelectric polymers. The available equipment includes poling devices, such as corona and high voltage setups, and a thermally stimulated current setup to investigate the energetic trap structure in dielectrics as well as the thermal charging and discharging under high electric fields. The field of photo- and photostimulated luminescent (PSL) materials (phosphors) is - 19 -
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
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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 22 and 23: concerned with the synthesis and ch
Page 24 and 25: Publications Fleissner, A.; Schmid,
Page 26 and 27: • Surface analysis The UHV-surfac
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Page 30 and 31: Thin films The Thin Film division w
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Page 44 and 45: hexakis(imidazole)nickel(II)bis(for
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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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