Improved performance of a near-field thermophotovoltaic device by a back gapped reflector

Feng, Dudong; Yee, Shannon K.; Zhang, Zhuomin M.

doi:10.1016/j.solmat.2021.111562

Title: Improved performance of a near-field thermophotovoltaic device by a back gapped reflector

Journal Article · 28 December 2021 · Solar Energy Materials and Solar Cells

DOI: https://doi.org/10.1016/j.solmat.2021.111562 · OSTI ID:1866204

^[1];

^[2]; Zhang, Zhuomin M. ^[2]

Georgia Institute of Technology, Atlanta, GA (United States); Georgia Institute of Technology
Georgia Institute of Technology, Atlanta, GA (United States)

Various spectral control techniques can be applied to improve the performance of a thermophotovoltaic (TPV) device. For example, a back surface reflector (BSR) is a common structure to improve the performance of TPV devices. A conventional metal BSR structure enhances the photogeneration rate by increasing the absorption probability of photons via back surface reflections, affording a second chance for absorption. However, the effects of surface passivation and external luminescence introduced by BSR structures have been previously ignored, which potentially decreases the performance of TPV devices. Recently, a back gapped reflector (BGR) structure was proposed to greatly improve the performance of far-field TPV devices by reducing imperfect reflections at the semiconductor-metal interface. In the present work, the performance improvement on a thin-film, near-field InAs TPV device with a BGR is investigated, comparing its performance to that with a conventional metal BSR. Surface passivation conditions are also investigated to further improve the performance of TPV devices with back reflectors. Further, the output power and efficiency are calculated using an iterative model combining fluctuational electrodynamics and the full drift diffusion model. For the well-passivated condition, when the BSR is replaced by the BGR, the calculated conversion efficiency of the near-field TPV was improved from 16.4% to 21% and the output power was increased by 10%. Finally, the absorption of the back reflectors and external luminescence loss are analyzed to explain the performance improvement.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018369

OSTI ID:: 1866204

Journal Information:: Solar Energy Materials and Solar Cells, Journal Name: Solar Energy Materials and Solar Cells Vol. 237; ISSN 0927-0248

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Improved performance of a near-field thermophotovoltaic device by a back gapped reflector

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