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Proceedings Paper

Efficiencies and limiting factors of narrow bandgap thermophotovoltaic cells (Conference Presentation)

Paper Abstract

We identified the factors that limit the conversion efficiency of narrow bandgap thermophotovoltaic (TPV) cells and investigated how these factors affect key performance aspects such as quantum efficiency (QE), fill factor and open-circuit voltage. Calculations are made for narrow bandgap InAs/GaSb superlattice materials to elucidate how the conversion efficiency is limited by these factors for specific material parameters such as the product of absorption coefficient a and diffusion length L. It is shown that the multi-stage interband cascade (IC) structure is able to solve the problem of low QE in single-absorber TPV cells, therefore, increase conversion efficiency by about 10% in a wide range of aL. Also, the dependence of conversion efficiency on the illumination source is investigated, which shows the flexibility and advantage of multi-stage IC structure to achieve its maximum efficiency with the incident photon energy near the bandgap.

Paper Details

Date Published: 10 March 2020
PDF
Proc. SPIE 11275, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX, 1127511 (10 March 2020); doi: 10.1117/12.2542920
Show Author Affiliations
Wenxiang Huang, The Univ. of Oklahoma (United States)
Rui Q. Yang, The Univ. of Oklahoma (United States)


Published in SPIE Proceedings Vol. 11275:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IX
Alexandre Freundlich; Masakazu Sugiyama; Stéphane Collin, Editor(s)

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