Photovoltaic Materials, Devices, and Technologies

High-efficiency solar-thermophotovoltaic system equipped with a monolithic planar selective absorber/emitter

[+] Author Affiliations
Makoto Shimizu

Tohoku University, Graduate School of Engineering, Aoba 6-6-01 Aramaki Aoba-ku, Sendai 980-8579, Japan

Asaka Kohiyama

Tohoku University, Graduate School of Engineering, Aoba 6-6-01 Aramaki Aoba-ku, Sendai 980-8579, Japan

Hiroo Yugami

Tohoku University, Graduate School of Engineering, Aoba 6-6-01 Aramaki Aoba-ku, Sendai 980-8579, Japan

J. Photon. Energy. 5(1), 053099 (Jan 09, 2015). doi:10.1117/1.JPE.5.053099
History: Received October 2, 2014; Accepted December 8, 2014
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Abstract.  We demonstrate a high-efficiency solar-thermophotovoltaic system (STPV) using a monolithic, planar, and spectrally selective absorber/emitter. A complete STPV system using gallium antimonide (GaSb) cells was designed and fabricated to conduct power generation tests. To produce a high-efficiency STPV, it is important to match the thermal radiation spectrum with the sensitive region of the GaSb cells. Therefore, to reach high temperatures with low incident power, a planar absorber/emitter is incorporated for controlling the thermal radiation spectrum. This multilayer coating consists of thin-film tungsten sandwiched by yttria-stabilized zirconia. The system efficiency is estimated to be 16% when accounting for the optical properties of the fabricated absorber/emitter. Power generation tests using a high-concentration solar simulator show that the absorber/emitter temperature peaks at 1640 K with an incident power density of 45W/cm2, which can be easily obtained by low-cost optics such as Fresnel lenses. The conversion efficiency became 23%, exceeding the Shockley–Queisser limit for GaSb, with a bandgap of 0.67 eV. Furthermore, a total system efficiency of 8% was obtained with the view factor between the emitter and the cell assumed to be 1.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Makoto Shimizu ; Asaka Kohiyama and Hiroo Yugami
"High-efficiency solar-thermophotovoltaic system equipped with a monolithic planar selective absorber/emitter", J. Photon. Energy. 5(1), 053099 (Jan 09, 2015). ; http://dx.doi.org/10.1117/1.JPE.5.053099


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