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7 results on '"Klaus-Werner Benz"'

2. Dewetted growth of CdTe in microgravity (STS-95)

Author

Ernesto Diéguez, T. Duffar, Gérald Roosen, Jean-Claude Launay, V. Babentsov, V. Chevrier, Michael Fiederle, P. Dusserre, Philippe Delaye, Victoria Corregidor, Klaus-Werner Benz, Freiburger Materialforschungszentrum, Albert-Ludwigs-Universität Freiburg, Elaboration par procédés magnétiques (EPM), Centre National de la Recherche Scientifique (CNRS), Departamento de Fisica de Materiales, Universidad Autonoma de Madrid (UAM), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), and Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB)

Subjects
Photoluminescence, Materials science, Dewetting, Nanotechnology, 02 engineering and technology, 01 natural sciences, 010305 fluids & plasmas, law.invention, law, Detached, 0103 physical sciences, Microscopy, Bridgman method, Melt growth, General Materials Science, General Chemistry, CdTe, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Synchrotron, Cadmium telluride photovoltaics, Characterization (materials science), Reference sample, Microgravity, 0210 nano-technology
Abstract

Two CdTe crystals had been grown in microgravity during the STS-95 mission. The growth configuration was dedicated to obtain dewetting of the crystals and to achieve high quality material. Background for the performed experiments was based on the theory of the dewetting and previous experience. The after flight characterization of the crystals has demonstrated existance of the dewetting areas of the crystals and their improved quality regarding the earth grown reference sample. The samples had been characterized by EDAX, Synchrotron X-ray topography, Photoluminescence and Optical and IR microscopy. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Published
2004

3. Dewetted growth and characterisation of high-resistivity CdTe

Author

Philippe Delaye, Michael Fiederle, Jean-Claude Launay, Victoria Corregidor, Alex Fauler, Pierre Dusserre, T. Duffar, Jean-Paul Garandet, V. Babentsov, Ernesto Diéguez, Gérald Roosen, V. Chevrier, Klaus-Werner Benz, Freiburger Materialforschungszentrum, Albert-Ludwigs-Universität Freiburg, Elaboration par procédés magnétiques (EPM), Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), DTEN (DTEN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Departamento de Fisica de Materiales, Universidad Autónoma de Madrid (UAM), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS), Universidad Autonoma de Madrid (UAM), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), and Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université de Bordeaux (UB)

Subjects
010302 applied physics, Photoluminescence, Chemistry, Dewetting, Cadmium compounds, Doping, Mineralogy, 02 engineering and technology, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Cadmium telluride photovoltaics, Ampoule, Inorganic Chemistry, Crystal, High resistivity, Electrical resistivity and conductivity, Single crystal growth, 0103 physical sciences, Materials Chemistry, Composite material, 0210 nano-technology
Abstract

Undoped and Ge-doped CdTe crystals have been grown using the dewetting phenomenon on the earth. A gap effected by the dewetting between the crystal and ampoule was created with a thickness up to 60 μm, but it was not stable for the complete growth process. The dewetting was stable for the first 25 mm of the growth, but than it got unstable. The main deteriorating factor was a change of a liquid–solid interface shape from the convex to concave. Structural, electrical, photoelectrical and optical characteristics of the studied samples showed better material quality in dewetted areas.

Published
2004

4. Simulation of industrial crystal growth by the vertical Bridgman method

Author

Klaus-Werner Benz, Gerhard Dziuk, Eberhard Bänsch, Thomas Kaiser, Stefan Boschert, Kunibert G. Siebert, and Alfred Schmidt

Subjects
Convection, Crystal, Phase boundary, Materials science, Computer simulation, Stefan problem, Mechanics, Boundary value problem, Ampoule, Finite element method
Abstract

Single crystals of Cadmium-Zinc-Telluride are used as a substrate material for the production of infrared detectors and are usually grown by the vertical Bridgman method. We present a simulation of the whole growth process in two steps: In the first step, the (stationary) heat transport in the furnace is modeled and calculated for different positions of the ampoule. This provides information about the most important parameter during this process: the temperature distribution in furnace and ampoule. The obtained temperatures are then used in the second step as boundary conditions for the (time dependent) simulation of temperature and convection in the ampoule. Only the use of adaptive finite element methods allows an efficient numerical simulation of the moving phase boundary, the convection in the melt and the temperature distribution in melt and crystal. Numerical results are presented for both furnace and ampoule simulations.

Published
2003

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