Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 31: Poster II
HL 31.61: Poster
Dienstag, 26. Februar 2008, 16:30–19:00, Poster D
Structural, optical and electrical properties of novel phase change alloys — •Sarah Gindner, Michael Woda, Stephan Kremers, Michael Klein, and Matthias Wuttig — I. Physikalisches Institut (1A), RWTH Aachen, 52056 Aachen
Phase Change Materials (PCM) are Te or Sb containing alloys, which show a remarkable property combination. They possess a very large property contrast, e.g. electrical resistivity and optical reflectivity between the amorphous and crystalline state. At the same time they can be switched between these two states very rapidly on a ns timescale using either a laser or current pulse. Hence they are used in rewriteable optical storage media such as DVDs and Blue-ray disks and are promising candidates for non-volatile electronic memories such as Phase Change Random Access Memory (PCRAM). From a scientific point of view it is important to determine their structural properties. In this study possible new PCM including CuInTe2 and Ge3Sb6Te5 are investigated by a variety of techniques to understand the effect of stoichiometric change upon physical properties. From these techniques the suitability of new materials for phase change application is derived and will be discussed. Temperature dependent resistivity is investigated with the van der Pauw technique. XRD measurements reveal the structural properties of the amorphous and crystalline state. The structural changes causing changes in film thickness and density are measured with x-ray reflectometry. Optical properties (0,02 eV to 5.3 eV) of the PCM are determined by FTIR and ellipsometry measurements.