@article{MuellerHoffmannMilkoetal., author = {M{\"u}ller, Klaus and Hoffmann, Patrick and Milko, S. and Burkov, Yevgen and Schmeißer, Dieter}, title = {PEEM and µ-NEXAFS of Cu-In-S-Surfaces}, abstract = {The composition of CuInS2-films tends to differ from the ideal ratio of 1:1:2. A molecularlyvariation of dm=[Cu]/[In]-1 not equal 0 occurs due to the formation of binary phases as segregation's at the surface, as crystallites in the bulk of the film or at the surface of grains [1]. Furthermore, the range of homogeneity of the phase CuInS2 is relatively large caused by a low enthalpy of formation of defects like Cu-vacancies [2]. Segregation's at surfaces can be removed by KCN etching or by an electrochemical process [3, 4] We investigated the effect of an in-situ-heat-treatment of samples, prepared in the Cu-rich regime with additional amounts of copper, deposited on the surface of the Cu-In-S-films.We used Cu-In-S-films on molybdenum, prepared from precursors of Cu/In and a following reactive annealing-process in a sulphur-atmosphere. The experiments were performed as follows: The surface of the films was cleaned in situ to remove CuS-Phases by Argon-bombardment. The thin layers of additional Copper were prepared by evaporation of copper metal in Knudsen-cells. The thickness of this copper-films is in the range of monolayers, revealed by a calibration with copper on iron-substrates. After this deposition the samples were heated up to several temperatures (up to 550 ºC) for ten minutes, respectively. Here the molybdenum back-contact was used as electrical heater.}, language = {en} } @article{ScholzReiterFreitagSchmiederetal., author = {Scholz-Reiter, Bernd and Freitag, M. and Schmieder, A. and M{\"u}ller, S.}, title = {Nichtlineare Dynamik und PPS}, language = {de} } @article{ScholzReiterMuellerKoehleretal., author = {Scholz-Reiter, Bernd and M{\"u}ller, S. and K{\"o}hler, Corinna and Freitag, M.}, title = {Durchlauf- und Bestandssteuerungskonzept f{\"u}r die Fertigung}, language = {de} } @article{MuellerMilkoSchmeisser, author = {M{\"u}ller, Klaus and Milko, S. and Schmeißer, Dieter}, title = {Preparation of stoichiometric CuInS2-surfaces - an XPS, UPS-study}, series = {Thin Solid Films}, volume = {431-432}, journal = {Thin Solid Films}, issn = {0040-6090}, pages = {312 -- 316}, abstract = {CuInS2 films are investigated with photoelectron spectroscopy. We find significant deviation from the stoichiometric composition depending on the preparation on the films. For Cu-rich films (start composition) we show that by Ar sputtering and annealing the surface composition varies along a binary cut of the Cu-In-S ternary phase diagram. We also present a novel technique which brings the surface composition close to the stoichiometric stability range of the CuInS2 phase. The technique used the evaporation of Cu on the sputter cleaned surface.}, language = {en} } @article{BaerMuellerRost, author = {B{\"a}r, F. and M{\"u}ller, S. and Rost, M.}, title = {Effiziente Braunkohleverstromung in einer Druckwirbelschichtfeuerung mit Teilvergasung}, language = {de} } @article{MuellerWawrzyniak, author = {M{\"u}ller, S. and Wawrzyniak, Adam}, title = {Warum f{\"u}r ein Schluck Milch die ganze Kuh kaufen?}, language = {de} }