Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 32: Poster I: Group II - Oxides
HL 32.7: Poster
Dienstag, 23. März 2010, 18:30–20:30, Poster D1
Investigation of piezoelectric and thermoelectric properties of ZnO microstructures — •Irina Laubenstein1, Marcel Ruth1, Alexander M. Bernhart2, Johannes Schaffert2, Christian A. Bobisch2, Rolf Möller2, and Cedrik Meier1 — 1University of Paderborn, Experimental Physics & CeOPP - Center for Optoelectronics & Photonics Paderborn, Warburger Str. 100, 33098 Paderborn — 2University of Duisburg-Essen, Experimental Physics, Lotharstr. 1, 47057 Duisburg
Metal oxides are highly attractive in high-temperature thermoelectric applications due to their inherent oxidation resilience and thermal resistance. Especially zinc oxide (ZnO) is a promising candidate. Alloying can increase the electric conductivity and at the same time decrease the thermal conductivity. Going to nanoscale dimensions, even less thermal conductivity is expected, because of phonon barriers caused by additional interfaces.
We demonstrate the first results of Seebeck-coefficient measurements on especially developed ZnO-microstructures as an intermediate step towards ZnO-nanostructures. Commercially available hydrothermally grown ZnO-crystals as well as plasma-assisted MBE (molecular beam epitaxy) grown ZnO-epilayers on c-plane sapphire substrates are used as basis materials. Furthermore, we investigate the piezoelectric properties of the devices by controllably exerting an external force using a UHV-four-probe scanning tunneling microscope (STM).
Financial support by BMBF via the NanoFutur grant 03X5509-NanoPhox & DFG via SFB616.