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

Makoto Shimizu, Asaka Kohiyama, Hiroo Yugami

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

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.

Original languageEnglish
Article number053099
JournalJournal of Photonics for Energy
Volume5
Issue number1
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • gallium antimonide
  • solar energy
  • spectral control of thermal radiation
  • thermophotovoltaic

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Renewable Energy, Sustainability and the Environment

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