9 January 2015 High-efficiency solar-thermophotovoltaic system equipped with a monolithic planar selective absorber/emitter
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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 45  W/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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Makoto Shimizu, Makoto Shimizu, Asaka Kohiyama, Asaka Kohiyama, Hiroo Yugami, Hiroo Yugami, } "High-efficiency solar-thermophotovoltaic system equipped with a monolithic planar selective absorber/emitter," Journal of Photonics for Energy 5(1), 053099 (9 January 2015). https://doi.org/10.1117/1.JPE.5.053099 . Submission:
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