elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Potential & Seebeck Microprobe – Imaging of electrical and thermoelectric material properties on the microscale

Ziolkowski, P. and Karpinski, G. and Platzek, D. and Stiewe , C. and Müller, E. (2009) Potential & Seebeck Microprobe – Imaging of electrical and thermoelectric material properties on the microscale. DPG Frühjahrstagung, 22.-27. März 2009, Dresden.

Full text not available from this repository.

Abstract

Recent developments turned the Potential & Seebeck Microprobe (PSM) into a powerful tool for electrical functional materials characterisation. A wide spectrum of applications has been demonstrated including thermoelectric cobalt antimonide and bismuth telluride films including nano-structured thick films. The principle involves a heated probe tip positioned at the surface of a sample coupled to a heat sink. The probe tip contains a thermocouple, the sample is connected to another thermo¬couple, together forming independent circuits containing the probe–sample contact. The sample is scanned by mechanically touching and again disconnecting the surface at each position. A rapidly sensing electronic contact detection prevents fragile thin films down to 1 µm and thinner from being damaged by the probe tip. The tip is heating up the sample in a micro-vicinity, forming a locally focused temperature gradient. By several measuring circuits, thermo-voltages and the temperature drop over the gradient region are recorded, yielding the local Seebeck coefficient. With an electrical current fed through, the potential profile over the sample is monitored. Micro-resolving images both of the Seebeck coefficient and the potential obtained in a single run provide information on functional effects of the distribution of chemical compo¬nents, phases, alloying elements, or dopants. The method is particularly helpful to study functionally segmented or graded materials. The facility is suitable for low resistivity materials which are difficult because of extremely low signals.

Document Type:Conference or Workshop Item (Speech)
Title:Potential & Seebeck Microprobe – Imaging of electrical and thermoelectric material properties on the microscale
Authors:
AuthorsInstitution or Email of Authors
Ziolkowski, P.German Aerospace Center, Köln, Germany
Karpinski, G.German Aerospace Center, Köln, Germany
Platzek, D.Physics Technology – Development and Consulting (PANCO), D-56218 Mühlheim-Kärlich, Germany
Stiewe , C.German Aerospace Center, Köln, Germany
Müller, E.German Aerospace Center, Köln, Germany
Date:26 March 2009
Status:Accepted
Keywords:thermoelectric measurement - Seebeck coefficient - functionally graded or segmented material
Event Title:DPG Frühjahrstagung
Event Location:Dresden
Event Type:national Conference
Event Dates:22.-27. März 2009
Organizer:Deutsche Physikalische Gesellschaft (DPG)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W SY - Technik für Raumfahrtsysteme
DLR - Research area:Space
DLR - Program:W SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):W - Vorhaben SISTEC (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Dr. Knud Zabrocki
Deposited On:26 Nov 2009 10:07
Last Modified:26 Nov 2009 10:07

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.