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Browse Journals & Magazines > Journal of Applied Physics ...> Volume:100 Issue:11 Help

Thermoelectric power in very thin film thermocouples: Quantum size effects

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5 Author(s)
Cattani, M. ; Institute of Physics, University of São Paulo, C.P. 66318, CEP 05315-970, São Paulo, Brazil ; Salvadori, M.C. ; Vaz, A.R. ; Teixeira, F.S.
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The thermoelectric power SF of thin film thermocouples is related to the bulk thermopower Sbulk by ΔSF(t)=Sbulk-SF as a linear function of 1/t when t≫ℓ, where ℓ is the electron mean free path and t the film thickness. For these conditions quantum size effects (QSEs) are negligible. However, when t≪ℓ QSEs become relevant. In recent work we have shown that for Pt/Au thermocouples with film thickness t≪ℓPt≈10 nm, ΔSF(t)=0.194+26.7(1/t)-93.6(1/t)2+112.0(1/t)3. Here we show that this nonlinear 1/t behavior is due to QSE.

Published in:
Journal of Applied Physics  (Volume:100 ,  Issue: 11 )

Date of Publication: Dec 2006

Page(s):
114905 - 114905-4
ISSN :
0021-8979
Digital Object Identifier :
10.1063/1.2388046
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Dec 2006

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