Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 61: Poster II: Materials, Interfaces and Heterostructures

HL 61.30: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D1

Thermoelectric measurements on artificially structured ZnO/ZnS multilayers — •Steve Petznick, Achim Kronenberger, Gert Homm, Thorsten Henning, Peter J. Klar, and Bruno K. Meyer — 1. Physikalisches Institut, Gießen, Deutschland

A multilayer-system of alternating ZnO and ZnS layers of about 1 µm thickness in total is deposited by RF magnetron sputtering on different substrates. A pattern of square-holes in the µm range is transferred into this multilayer system by photolithography followed by ion beam or wet-chemical etching. In a second sputter step another multilayer-system of the same two materials is sputtered on the sample with the identical number of layers but with the reversed layer sequence. In the cross section of the sample one obtains a pattern of the alternating materials. The ZnO layers are n-type with different electron concentrations while the ZnS layers are almost insulating. The Seebeck coefficient of this system is measured in the temperature range of 50 to 300 K. The influence of the high number of interfaces on the transport behaviour and on the Seebeck coefficient is investigated.