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5. Role of spectral non-idealities in the design of solar thermophotovoltaics

Author

Evelyn N. Wang, Youngsuk Nam, David M. Bierman, Andrej Lenert, Massachusetts Institute of Technology. Department of Mechanical Engineering, Wang, Evelyn N., Lenert, Andrej, and Bierman, David Matthew

Subjects
Materials science, Hot Temperature, Light, business.industry, Photovoltaic system, Optical Devices, Equipment Design, Radiation, Models, Theoretical, Solar energy, Atomic and Molecular Physics, and Optics, Cutoff frequency, Equipment Failure Analysis, Optics, Electric Power Supplies, Thermophotovoltaic, Solar Energy, Optoelectronics, Computer-Aided Design, Scattering, Radiation, Thermal emittance, Computer Simulation, business, Common emitter, Dimensionless quantity
Abstract

To bridge the gap between theoretically predicted and experimentally demonstrated efficiencies of solar thermophotovoltaics (STPVs), we consider the impact of spectral non-idealities on the efficiency and the optimal design of STPVs over a range of PV bandgaps (0.45-0.80 eV) and optical concentrations (1-3,000x). On the emitter side, we show that suppressing or recycling sub-bandgap radiation is critical. On the absorber side, the relative importance of high solar absorptance versus low thermal emittance depends on the energy balance. Both results are well-described using dimensionless parameters weighting the relative power density above and below the cutoff wavelength. This framework can be used as a guide for materials selection and targeted spectral engineering in STPVs., United States. Dept. of Energy. Office of Basic Energy Sciences (DE-FG02-09ER46577)

Published
2015

6. Design of wide-angle selective absorbers/emitters with dielectric filled metallic photonic crystals for energy applications.

Author

Chou JB, Yeng YX, Lenert A, Rinnerbauer V, Celanovic I, Soljačić M, Wang EN, and Kim SG

Abstract

The design and simulation of a wide angle, spectrally selective absorber/emitter metallic photonic crystal (MPhC) is presented. By using dielectric filled cavities, the angular, spectrally selective absorption/emission of the MPhC is dramatically enhanced over an air filled design by minimizing diffraction losses. Theoretical analysis is performed and verified via rigorous coupled wave analysis (RCWA) based simulations. An efficiency comparison of the dielectric filled designs for solar thermophotovoltaic applications is performed for the absorber and emitter which yields a 7% and 15.7% efficiency improvement, respectively, compared to air filled designs. The converted power output density is also improved by 33.5%.

Published
2014
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