@misc{AggourStoerkelMurrelletal., author = {Aggour, Mohammed and Stoerkel, Ulrich and Murrell, Chris and Campbell, S. A. and Jungblut, H. and Hoffmann, Patrick and Mikalo, Ricardo Pablo and Schmeißer, Dieter and Lewerenz, Hans-Joachim}, title = {Electrochemical interface modification of CuInS2 thin films}, abstract = {We studied two novel electrochemical treatments of CuInS2 solar-cell absorber films, introduced to remove the deleterious segregated CuS phase. Their influence onsurface topography, chemistry and electronic properties was investigated using in situ atomic force microscopy (AFM) and photoclectron spectroscopy, performed inpart at the U49/2 undulator beam line at BESSY II. The results are examined in order to develop an improved understanding of the chemical-electrochemical surfacetransformation processes.}, language = {en} } @misc{MuellerHenkelMikaloetal., author = {M{\"u}ller, Klaus and Henkel, Karsten and Mikalo, Ricardo Pablo and Paloumpa, Ioanna and Schmeißer, Dieter}, title = {Elektronik mit organischen Materialien}, publisher = {BTU Cottbus, Eigenverlag}, abstract = {Plastikelektronik, flexible Solarzellen, intelligente Kleidung, neuartige und maßgeschneiderte Transducer f{\"u}r die Gas-, Fl{\"u}ssigkeits- und Biosensorik, all dies sind Anwendungen, die ohne halbleitende Polymere nicht denkbar w{\"a}ren und die Bereiche erschließen, in denen zur Zeit eine regelrechte Goldgr{\"a}berstimmung herrscht. Mit wichtigen Beitr{\"a}gen im Grundlagen- und Anwendungsbereich nimmt die BTU Cottbus an dieser Entwicklung teil, u. a. auch durch eine Kooperation mit dem Institut f{\"u}r Mikrobiologie des Carl-Thiem-Klinikums Cottbus.In diesem Artikel werden die Voraussetzungen f{\"u}r die Konstruktion organischer Feldeffekt-Transistoren mit gassensitiver Gate-Elektrode vorgestellt. Untersuchungen zur elektronischen Struktur des organischen Halbleiters Poly(3-Hexylthiophen), die Anwendung dieses Materials als aktive Schicht in organischen Feldeffekt-Transitoren, die Gassensitivit{\"a}t von Polypyrrolelektroden auf Quarz-Mikrowaagen und die Mikrorstukturierung organischer Elektroden werden beschrieben.}, language = {de} } @misc{BeerbomMayerJaegermannetal., author = {Beerbom, Martin and Mayer, Thomas and Jaegermann, Wolfram and Batchelor, David R. and Schmeißer, Dieter}, title = {Synchrotron-induced photoemission of GaAs electrodes after electrochemical treatment in aqueous electrolytes}, abstract = {Electrochemically-induced oxidation and reduction reactions of UHV-cleaved GaAs(110) surfaces have been studied after emersion under potential control using highresolution synchrotron-induced photoelectron spectroscopy. High quality spectra of the As and Ga core 3d lines and the valence band region have been obtained. Thespectra of the anodic oxide show strong emission of bulk-like Ga2O3 and some As2O3 with the admixture of suboxides and hydroxides. Ga2O3 and As2O3 arecathodically reduced leaving the GaAs surface covered mostly with elemental As, some As-H and remnants of Ga-suboxides and -hydroxides.}, language = {en} } @misc{LewerenzAggourMurrelletal., author = {Lewerenz, Hans-Joachim and Aggour, Mohammed and Murrell, Chris and Kanis, M. and Hoffmann, Patrick and Jungblut, H. and Schmeißer, Dieter}, title = {Interface engineering of photoelectrochemically prepared Si surfaces}, abstract = {The oxide of Si(111) formed by electropolishing in dilute ammonium fluoride solution is analysed by photoelectron spectroscopy using synchrotron radiation. The oxidiclayer is about 3.1 nm thick and contains Si-F-x species as well as oxyfluorides. The oxyfluorides are found preferentially at the electropolishing layer surface. SiOHspecies are concentrated at the oxidic film/substrate interface. The full width half maximum of the Si 2p line indicates that the Si/electropolishing oxide interface issmoother than the Si/natural oxide interface.}, language = {en} } @misc{LupinaDabrowskiFormaneketal., author = {Lupina, Grzegorz and Dabrowski, Jarek Marek and Formanek, Peter and Schmeißer, Dieter and Sorge, Roland and Wenger, Christian and Zaumseil, Peter and M{\"u}ssig, Hans-Joachim}, title = {Solid-state reaction between Pr and SiO2 studied by photoelectron spectroscopy and ab initio calculations}, series = {Materials Science in Semiconductor Processing}, volume = {7}, journal = {Materials Science in Semiconductor Processing}, number = {4-6}, issn = {1369-8001}, pages = {215 -- 220}, abstract = {We report on the structural and electrical properties of Pr-based high-k dielectric films fabricated by solid-state reaction between metallic Pr and SiO2 underlayers. A non-destructive depth profiling using synchrotron radiation excited photoelectron spectroscopy (SR-PES), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) were employed to examine the chemical composition and microstructure. Ab initio calculations were done to gain insight into the physical processes involved. SR-PES results indicate that Pr deposition at room temperature (RT) leads to the formation of a Pr silicide and a Pr oxide, what is in good agreement with the scenario expected from ab initio calculations. As revealed by TEM and electrical measurements, oxidation of the reacted structures, followed by annealing, results in a stacked dielectric composed of a SiO2-based buffer with an enhanced permittivity and a Pr silicate film with a high dielectric constant. The leakage current density of 10-4 A/cm2 was measured for stacks with capacitance equivalent thickness (CET) of 1.5 nm prepared by evaporation of the Pr layer on a 1.8 nm SiO2 film, followed by oxidation in air ambient and annealing in N2 atmosphere. The capacitance-voltage (C-V) curves exhibit a large flatband voltage (VFB) shift indicating the presence of a positive charge in the stack. Switching away from the Al contacts to Au gate electrodes introduces a significant reduction of the VFB by 1.3 eV, what is much more than the change expected from the work function difference between Al and Au (not, vert, similar0.9 eV). This in turn implies that VFB is strongly affected by the gate interface electrode.}, language = {en} } @misc{YfantisTzalasLambrakopoulosetal., author = {Yfantis, Alexandros D. and Tzalas, B. and Lambrakopoulos, S. and Anagnostaki, E. and Schmeißer, Dieter}, title = {New chrome free, environmentally friendly methods in chemical processes}, abstract = {It gives an overview of the research work to develop chrom-free methods in different chemical processes. A new class of materials, the conductive polymers, have been studied extensively for their anticorrosion properties.}, language = {en} } @misc{YfantisPaloumpaSchmeisser, author = {Yfantis, Alexandros D. and Paloumpa, Ioanna and Schmeißer, Dieter}, title = {Corrosion Protection by Conductive Polymers for Magnesium Alloys}, series = {Magnesium, proceedings of the 6th International Conference on Magnesium Alloys and their Applications, November 2003 in Wolfsburg}, journal = {Magnesium, proceedings of the 6th International Conference on Magnesium Alloys and their Applications, November 2003 in Wolfsburg}, editor = {Kainer, Karl Ulrich}, publisher = {Wiley-VCH}, address = {Weinheim}, isbn = {3-527-30975-6}, pages = {605 -- 610}, abstract = {In this work, we present the experimental data related to the effect of the polypyrrole concentration and the film thickness on the corrosion inhibition properties of these novel polymer coatings. The relative corrosion resistance properties of the films formed from the matrix solutions, where polypyrrole was in situ polymerized and in cases where polypyrrole is dispersed in a form of powder (pigment) in the polyaclylic polymer, are further examined. The evaluation of the experimental data provides significant evidence regarding the mechanism of corrosion inhibition, as well as the optimization of the synthesis and application conditions.}, language = {en} } @misc{LamprakopoulosSchmeisserAnastassopoulouetal., author = {Lamprakopoulos, Stelios and Schmeißer, Dieter and Anastassopoulou, Jane and Theophanides, Theophile and Yfantis, Alexandros D.}, title = {An FTIR study of the role of H2O and D2O in the aging mechanism of conductive polypyrroles}, series = {Synthetic Metals}, volume = {144}, journal = {Synthetic Metals}, number = {3}, issn = {0379-6779}, doi = {10.1016/j.synthmet.2004.03.006}, pages = {229 -- 234}, abstract = {In the present work the role of H2O was studied by conductivity measurements and FTIR spectroscopy using the isotopic effect of deuterium in order to elucidate the aging mechanism of conductivity of polypyrroles. Polypyrrole was prepared with PTS as a dopant, by using deuterated water. Conductivity measurements showed changes due to structural water and atmospheric humidity. The FTIR absorption spectra indicated that the most probable structure of polypyrrole is the two-dimensional one. This finding could be attributed to the inhibition of polypyrrole's IR modes. The infrared spectrum analysis show that the gamma -NH bending mode of pyrrole has significantly changed after polymerization of pyrrole and this result is in accordance with XPS measurements.}, language = {en} } @misc{SidorenkoTokarevKreneketal., author = {Sidorenko, Alexander and Tokarev, Igor and Krenek, Radim and Burkov, Yevgen and Schmeißer, Dieter and Stamm, Manfred}, title = {XPEEM investigations of 2D hierachical array of Ni nanorods using block copolymer templates}, language = {de} } @misc{HenkelSohalTorcheetal., author = {Henkel, Karsten and Sohal, Rakesh and Torche, Mohamed and Paloumpa, Ioanna and M{\"u}ller, Klaus and Hoffmann, Patrick and Schmeißer, Dieter}, title = {Grenzfl{\"a}chenoptimierung f{\"u}r funktionale D{\"u}nnschichtsysteme: Oxide und Polymere}, series = {Forum der Forschung}, volume = {9}, journal = {Forum der Forschung}, number = {18}, issn = {0947-6989}, pages = {49 -- 56}, language = {de} } @misc{SeifarthBurkovSchmeisseretal., author = {Seifarth, Olaf and Burkov, Yevgen and Schmeißer, Dieter and Stamm, Manfred}, title = {Metallic nickel nanorod arrays embedded into ordered block copolymer templates}, series = {Thin Solid Films}, volume = {515}, journal = {Thin Solid Films}, number = {16}, issn = {0040-6090}, pages = {6552 -- 6556}, language = {en} } @misc{SchroederLupinaSeifarthetal., author = {Schroeder, Thomas and Lupina, Grzegorz and Seifarth, Olaf and Tallarida, Massimo and Schmeißer, Dieter}, title = {Synchrotron radiation x-ray photoelectron spectroscopy study on the interface chemistry of high-k PrxAl2-xO3 (x=0-2) dielectrics on TiN for dynamic random access memory applications}, series = {Journal of Applied Physics}, volume = {102}, journal = {Journal of Applied Physics}, number = {1}, issn = {0021-8979}, pages = {014103}, language = {en} } @misc{ZagorodniyChumakovTaeschneretal., author = {Zagorodniy, Kostyantyn and Chumakov, Dmytro and T{\"a}schner, Christine and Lukowiak, Anna and Stegmann, Heiko and Schmeißer, Dieter and Geisler, Holm and Engelmann, Hans-J{\"u}rgen and Hermann, Helmut and Zschech, Ehrenfried}, title = {Novel Carbon-cage based ultralow-k materials: Modelling and first experiments}, doi = {10.1109/TSM.2008.2005396}, language = {en} } @misc{BeerbomMayerJaegermannetal., author = {Beerbom, Martin and Mayer, Thomas and Jaegermann, Wolfram and Batchelor, David R. and Schmeißer, Dieter}, title = {Electrochemically Induced Redox-Reactions on GaAs-Surfaces: High Resolution Photoemission Spectra Taken at the U49/2 Beamline}, language = {en} } @misc{BatchelorSchmeisserFollath, author = {Batchelor, David R. and Schmeißer, Dieter and Follath, Rolf}, title = {The BTU Cottbus Beamline at BESSY II}, language = {de} } @misc{SowinskaDasWojciechowskietal., author = {Sowinska, Małgorzata and Das, Chittaranjan and Wojciechowski, Konrad and Rouissi, Zied and Snaith, Henry J. and Schmeißer, Dieter}, title = {Atomic layer deposition of Al2O3 on CH3NH3PbI3 for enhancement of perovskite solar cells stability}, series = {Synchrotron Radiation in Natural Science : Bulletin of the Polish Synchrotron Radiation Society}, volume = {15}, journal = {Synchrotron Radiation in Natural Science : Bulletin of the Polish Synchrotron Radiation Society}, number = {1-2}, issn = {1644-7190}, pages = {S. 33}, language = {en} } @misc{SchmeisserJanowitz, author = {Schmeißer, Dieter and Janowitz, Christoph}, title = {The Cu2p-edge of superconducting BiSrCu-Oxides studed by resonant Photoelectron Spectroscopy}, series = {Synchrotron Radiation in Natural Science : Bulletin of the Polish Synchrotron Radiation Society}, volume = {15}, journal = {Synchrotron Radiation in Natural Science : Bulletin of the Polish Synchrotron Radiation Society}, number = {1-2}, issn = {1644-7190}, pages = {S. 35}, language = {en} }