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Improvement of spatial resolution for local Seebeck coefficient measurements by deconvolution algorithm

Rev. Sci. Instrum. 80, 105104 (2009); doi:10.1063/1.3246815

Published 19 October 2009

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K. H. Wu,1 C. I. Hung,1 P. Ziolkowski,2 D. Platzek,2,3 G. Karpinski,2 C. Stiewe,2 and E. Mueller2
1Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
2Institute of Materials Research, German Aerospace Center (DLR), Cologne D-51170, Germany
3Physics Technology—Development and Consulting (PANCO), Muelheim-Kaerlich D-56218, Germany
A potential Seebeck microprobe apparatus is described such that a profile of Seebeck coefficients can be detected on a material sample surface for thermopower investigations. Due to its spatially resolved limit on detecting small inhomogeneities of dopants or composition changes, we here propose a constructive combination of numerical modeling and practical measurement to improve the spatial resolution by deconvolution algorithm. The relevant transfer function, obtained from numerical calculations, was successfully applied on real measurement data. Besides, an improvement in detecting the 1.5  µm inhomogeneity has been achieved by applying one transfer function of the known tip setup on a set of Seebeck line scan signals, obtained with 6  µm tip-sample contact length, 3  µs signal capture time after contact, and 0.75  µm scan period. The result showed that a system theoretical approach in terms of deconvolution algorithm could theoretically enhance the spatial resolution anyway, but is practically limited by the systemic preconditions (tip size, signal capture time, and scan period) and the signal to noise ratio of the captured thermovoltages. Therefore, we provide a clear understanding of systemic preconditions and their impacts on the detection of small inhomogeneities and thus the performance in the thermopower analysis. ©2009 American Institute of Physics
History: Received 30 April 2009; accepted 19 September 2009; published 19 October 2009
Permalink: http://link.aip.org/link/?RSINAK/80/105104/1
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KEYWORDS and PACS

Keywords
PACS
  • 72.15.Jf
    Thermoelectric and thermomagnetic effects (metals/alloys)
  • 71.10.-w
    Theories and models of many electron systems in condensed matter
  • 84.32.Hh
    Inductors and coils; wiring
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
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REFERENCES (21)
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