Pareto optimal spectrally selective emitters for thermophotovoltaics via weak absorber critical coupling (Conference Presentation)

Jonathan Foley; Nari Jeon; Alex Martinson; Stephen K Gray; Jonathan Roman; Jonathan Hernandez

doi:10.1117/12.2325327

18 September 2018 Pareto optimal spectrally selective emitters for thermophotovoltaics via weak absorber critical coupling (Conference Presentation)

Jonathan Foley, Nari Jeon, Alex Martinson, Stephen K Gray, Jonathan Roman, Jonathan Hernandez

Author Affiliations +

Proceedings Volume 10759, New Concepts in Solar and Thermal Radiation Conversion and Reliability; 107590O (2018) https://doi.org/10.1117/12.2325327
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

Tailoring the emission spectra of a thermophotovoltaic emitter away from that of a blackbody has the potential to minimize transmission and thermalization loss in a photovoltaic receiver. Selective thermophotovoltaic emitters could lead to solar energy conversion with efficiency greater than the Shockley-Queisser limit and could facilitate the generation of useful energy from waste heat. We introduce a new design to radically tune thermal emission that leverages the interplay between two resonant phenomena in a simple planar structure – absorption in weakly-absorbing thin films and reflection in multi-layer dielectric stacks. We will discuss a virtual screening approach based on Pareto optimality to identify a small number of promising structures for a selective thermal emitter from a search space of millions, several of which approach the ideal values of a step-function selective thermal emitter. We will also discuss the experimental realization of several simple and optimal structures, estimates of their device-level performance, and ongoing efforts to close the gap between theoretical estimates and experimentally-realized performance of these structures.

Conference Presentation

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Jonathan Foley, Nari Jeon, Alex Martinson, Stephen K Gray, Jonathan Roman, and Jonathan Hernandez "Pareto optimal spectrally selective emitters for thermophotovoltaics via weak absorber critical coupling (Conference Presentation)", Proc. SPIE 10759, New Concepts in Solar and Thermal Radiation Conversion and Reliability, 107590O (18 September 2018); https://doi.org/10.1117/12.2325327

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KEYWORDS

Solar energy

Absorption

Black bodies

Dielectrics

Energy efficiency

Estimation theory

Photovoltaics

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