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Ungaro C, Gray SK, Gupta MC. Graded-index structures for high-efficiency solar thermophotovoltaic emitting surfaces. Opt Lett. 2014;39(18):5259-62doi: 10.1364/OL.39.005259.
Ungaro, C., Gray, S. K., & Gupta, M. C. (2014). Graded-index structures for high-efficiency solar thermophotovoltaic emitting surfaces. Optics letters, 39(18), 5259-62. https://doi.org/10.1364/OL.39.005259
Ungaro, Craig, et al. "Graded-index structures for high-efficiency solar thermophotovoltaic emitting surfaces." Optics letters vol. 39,18 (2014): 5259-62. doi: https://doi.org/10.1364/OL.39.005259
Ungaro C, Gray SK, Gupta MC. Graded-index structures for high-efficiency solar thermophotovoltaic emitting surfaces. Opt Lett. 2014 Sep 15;39(18):5259-62. doi: 10.1364/OL.39.005259. PMID: 26466245.
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Opt Lett. 2014 Sep 15;39(18):5259-62. doi: 10.1364/OL.39.005259.

Graded-index structures for high-efficiency solar thermophotovoltaic emitting surfaces.

Optics letters

Craig Ungaro, Stephen K Gray, Mool C Gupta

PMID: 26466245 DOI: 10.1364/OL.39.005259

Abstract

This Letter presents a highly efficient emitter structure for solar thermophotovoltaic systems. The structure consists of a graded index on tungsten, shows a spectral efficiency of 59%, or 70% with the use of a back reflector, and is compared to other state-of-the-art emitter structures. The effects of different structures and periodicities on the efficiency of the emitter are explored, as well as the effect of a protective oxide coating. The causes of the antireflection properties of these structures are also explored.

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