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- W2606227515 abstract "In view of the combinatorial approach to discovery of new thermoelectric materials,it is highly desirable to have fast measurement techniques, if possible with capabilities toaccess local fluctuations or gradients in material properties.Using the generalized Planck& #39;s law of radiation [1] for fitting the photoluminescencespectra is the most appropriate technique to access the quasi Fermi level splitting and thetemperature of the carriers in a semiconductor. These two parameters enable to determineSeebeck coefficients for the material as a new photo-Seebeck effect [2].The absolutely calibrated photoluminescence intensity profile[3] with the spatialcoordinates combined with Callen coupled transport equations and with the kineticexpression of the transport parameters under the relaxation time approximation enable usto determine: the Seebeck coefficient, the electrical conductivity, the thermal electron andhole conductivity, the mobilities, the diffusion coefficients and the heat transferred from thecarriers to the lattice. All these parameters can be obtained either for electrons or forholes[4], even simultaneously, for intrinsic semiconductor in ambipolar regime.The method has been applied to a multi-quantum well structure of InGaAsP. Sincethe luminescence comes from the wells, this method enables to access the transportproperties in the plane of the wells inside the whole structure. Since photoluminescencedoes not require p-n junction nor high electrical conductivities for the measurement, thisoptical contactless measurement technique of thermoelectrinc transport parametersinvolving quasi-equilibrium carriers enables to access properties inside a given layer of thewhole structure or in materials with very low conductivities.We will also show the perspectives offered for the research of new thermoelectric materials.[1] Wurfel, J. Phys. C : Solid State Phys., 1982[2] Gibelli et al., Phys. Rev. Appl., 5 (2) 2016Tauc, Czech J Phys, 1955[3] Delamarre, Appl. Phys. Lett., 2012[4] Gibelli et al., Physica B, October 2016" @default.
- W2606227515 created "2017-04-28" @default.
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- W2606227515 date "2017-04-19" @default.
- W2606227515 modified "2023-09-27" @default.
- W2606227515 title "Optical contactless measurement of semiconductor thermoelectric transport properties (Conference Presentation)" @default.
- W2606227515 cites W2564184850 @default.
- W2606227515 doi "https://doi.org/10.1117/12.2253605" @default.
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