Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 9: Poster: Synthesis of Nanostructured Films by Self-organization, Thermoelectric Thin Films and Nanostructures, High-k and Low-k Dielectrics, Layer Deposition Processes, Layer Growth, Layer Properties, Application of Thin Films, Surface Modification, Hard and Superhard Coatings, Metal Layers

DS 9.47: Poster

Montag, 22. März 2010, 15:00–17:30, Poster D1

Modelling thermoelectric properties of ZnO/ZnS multilayer systems with a network model — •Florian Gather, Gert Homm, Markus Piechotka, Christian Heiliger, Peter J. Klar, and Bruno K. Meyer — I. Physikalisches Institut, Justus-Liebig-University, Heinrich-Buff-Ring 16, 35392 Giessen

Two different types of ZnO/ZnS multilayer systems are investigated. The first is a multilayer system with alternating layers of ZnO and ZnS. The second one consists of a chequer-board pattern of the two materials. For the modeling of the electric and thermal properties of both systems a two-dimensional network model was used. The spatial properties such as layer thicknesses and interface roughness are translated into a pixel grid. In order to calculate the thermal or electric resistance, each pixel cell consists of a node with a local resistance connected to the four nearest-neighbour pixel cells. The calculated total resistance of the network is then converted into an either electric or thermal conductance of the multilayer structure. To calculate the effective Seebeck-coefficient of the system a temperature difference between the contacts is applied. Then the individual temperature differences between the nodes are determined and used to calculate the local Seebeck-voltages. These are now implemented into the electric resistance network via voltage sources. To determine the effective Seebeck-coefficient of the multilayer structure the voltage between the contacts of the multilayer structure is calculated and divided by the applied temperature difference. The influence of the spatial parameters on the thermoelectric properties is studied. (SPP 1386)