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arXiv · 1310.2492

Photo-Seebeck effect in tetragonal PbO single crystals

P. S. Mondal·R. Okazaki·H. Taniguchi·I. Terasaki
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Abstract

We report the observation of photo-Seebeck effect in tetragonal PbO crystals. The photo-induced carriers contribute to the transport phenomena, and consequently the electrical conductivity increases and the Seebeck coefficient decreases with increasing photon flux density. A parallel-circuit model is used to evaluate the actual contributions of photo-excited carriers from the measured transport data. The photo-induced carrier concentration estimated from the Seebeck coefficient increases almost linearly with increasing photon flux density, indicating a successful photo-doping effect on the thermoelectric property. The mobility decreases by illumination but the reduction rate strongly depends on the illuminated photon energy. Possible mechanisms of such photon-energy-dependent mobility are discussed.

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P. S. Mondal, R. Okazaki, H. Taniguchi, I. Terasaki. 2013-10-09. Photo-Seebeck effect in tetragonal PbO single crystals. https://doi.org/10.1063/1.4829460

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