Schmelzzonenzuechtung von Verbindungs- und Elementhalbleitern unter Mikrogravitation Schlussbericht

Three microgravity Floating-Zone experiments have been performed and evaluated during the project: the growth of GaAs crystal with 20mm diameter during the D2-mission, the FZ-growth of silicon on TEXUS 29 and the recrystallization of a GaSb zone on TEXUS 32. In addition, Si-FZ experiment with axial magnetic fields have been started for comparison with the #mu#g results. The D2-experiment was mainly related to the strong reduction of crystal defects, whereas segregation was the main topic of the TEXUS 29 and the magnetic field experiments, leading to a more thorough understanding of the different roles of Marangoni and buoyancy convection on the segregation. The TEXUS 32 experiment allowed the determination of material parameters important for the FZ growth of GaSb, especially for the upcoming Spacehab-4 experiment. (orig.)Available from TIB Hannover: F96B575+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany); Deutsche Agentur fuer Raumfahrtangelegenheiten (DARA) GmbH, Bonn (Germany)DEGerman