Abstract
Four-leg thermoelectric oxide modules (TOMs) consisting of two p-type (La1.98Sr0.02CuO4) and two n-type (CaMn0.98Nb0.02O3) thermoelectric (TE) legs were produced with a manufacturing quality factor between 30 and 60%. The pressed sintered TE legs revealed 90% of the theoretical density to ensure a sufficient mechanical stability of the TE modules. The legs were connected electrically in series and sandwiched thermally in parallel between two Al2O3 plates serving as absorber and cooler, respectively. A solar cavity-receiver packed with an array of TOMs was subjected to concentrated thermal radiation with peak solar radiative flux intensities exceeding 600 kW/m2. Temperature distributions in the cavity, open-circuit voltage (VOC), and maximum output power (Pmax) were measured for different external loads and solar radiative fluxes (qin). Finally, the solar-to-electricity conversion efficiency (η) was calculated.
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ACKNOWLEDGMENTS
We thank the Swiss Federal Office of Energy and Swiss National Foundation for financial support and O. Brunko, D. Alfarug, and U. Gfeller for their help with the synthesis.
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Tomeš, P., Suter, C., Trottmann, M. et al. Thermoelectric oxide modules tested in a solar cavity-receiver. Journal of Materials Research 26, 1975–1982 (2011). https://doi.org/10.1557/jmr.2011.125
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DOI: https://doi.org/10.1557/jmr.2011.125