Volume 122, Number 6, June 2018
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||25 July 2018|
Theory of the photothermally generated Seebeck voltage in harmonic regime
1 Univ Lille Nord de France - 59044 Lille, France
2 UDSMM (EA 4476), MREI-1, Université du Littoral Côte d'Opale - 59140 Dunkerque, France
3 École supérieure d'ingénieurs des travaux de la construction de Caen (ESITC Caen) 1 rue Pierre et Marie Curie, 14610 Epron, France
Received: 22 March 2018
Accepted: 6 July 2018
In this paper, a general theory of the photothermally induced Seebeck voltage in the harmonic regime is presented. Conditions highlighting coupling effects between temperature and electric fields are reported. In the frequency domain, thermoelectric materials are governed by two regimes separated by a cut-off frequency. Below this point, there is no manifestation of coupling on the voltage response. In its vicinity and beyond, coupling appears through an effective Seebeck coefficient and an effective thermal conductivity. From this last quantity, the figure of merit can be, in principle, theoretically determined from the ratio of thermal conductivities obtained respectively at high and low frequencies or from the maximum value of the complex thermal conductivity argument at the cut-off frequency.
PACS: 72.20.Pa – Thermoelectric and thermomagnetic effects / 72.10.Bg – General formulation of transport theory / 72.15.Lh – Relaxation times and mean free paths
© EPLA, 2018
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