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Title: A Computational Simulation of Using Tungsten Gratings in Near-Field Thermophotovoltaic Devices

Abstract

Near-field thermophotovoltaic (NFTPV) devices have received much attention lately as an alternative energy harvesting system, whereby a heated emitter exchanges super-Planckian thermal radiation with a photovoltaic (PV) cell to generate electricity. This work describes the use of a grating structure to enhance the power throughput of NFTPV devices, while increasing the energy conversion efficiency by ensuring that a large portion of the radiation entering the PV cell is above the band gap. The device contains a high-temperature tungsten grating that radiates photons to a room-temperature In 0.18Ga 0.82Sb PV cell through a vacuum gap of several tens of nanometers. Scattering theory is used along with the rigorous coupled-wave analysis (RCWA) to calculate the radiation energy exchange between the grating emitter and the TPV cell. A parametric study is performed by varying the grating depth, period, and ridge width in the range that can be fabricated using available fabrication technologies. It is found that the power output can be increased by 40% while improving the efficiency from 29.9% to 32.0% with a selected grating emitter as compared to the case of a flat tungsten emitter. Reasons for the enhancement are found to be due to the enhanced energy transmission coefficient closemore » to the band gap. Furthermore, this work shows a possible way of improving NFTPV and sheds light on how grating structures interact with thermal radiation at the nanoscale.« less

Authors:
 [1];  [2];  [1];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Georgia Inst. of Technology, Atlanta, GA (United States); Nanjing Univ. of Aeronautics and Astronautics (China)
Publication Date:
Research Org.:
Georgia Tech Research Corp., Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1594750
Grant/Contract Number:  
SC0018369; FG02-06ER46343
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Heat Transfer
Additional Journal Information:
Journal Volume: 139; Journal Issue: 5; Journal ID: ISSN 0022-1481
Publisher:
ASME
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; fluctuation–dissipation theory; gratings; near-field thermal radiation; thermophotovoltaic

Citation Formats

Watjen, Jesse I., Liu, Xianglei, Zhao, Bo, and Zhang, Zhuomin. A Computational Simulation of Using Tungsten Gratings in Near-Field Thermophotovoltaic Devices. United States: N. p., 2017. Web. doi:10.1115/1.4035356.
Watjen, Jesse I., Liu, Xianglei, Zhao, Bo, & Zhang, Zhuomin. A Computational Simulation of Using Tungsten Gratings in Near-Field Thermophotovoltaic Devices. United States. https://doi.org/10.1115/1.4035356
Watjen, Jesse I., Liu, Xianglei, Zhao, Bo, and Zhang, Zhuomin. Tue . "A Computational Simulation of Using Tungsten Gratings in Near-Field Thermophotovoltaic Devices". United States. https://doi.org/10.1115/1.4035356. https://www.osti.gov/servlets/purl/1594750.
@article{osti_1594750,
title = {A Computational Simulation of Using Tungsten Gratings in Near-Field Thermophotovoltaic Devices},
author = {Watjen, Jesse I. and Liu, Xianglei and Zhao, Bo and Zhang, Zhuomin},
abstractNote = {Near-field thermophotovoltaic (NFTPV) devices have received much attention lately as an alternative energy harvesting system, whereby a heated emitter exchanges super-Planckian thermal radiation with a photovoltaic (PV) cell to generate electricity. This work describes the use of a grating structure to enhance the power throughput of NFTPV devices, while increasing the energy conversion efficiency by ensuring that a large portion of the radiation entering the PV cell is above the band gap. The device contains a high-temperature tungsten grating that radiates photons to a room-temperature In0.18Ga0.82Sb PV cell through a vacuum gap of several tens of nanometers. Scattering theory is used along with the rigorous coupled-wave analysis (RCWA) to calculate the radiation energy exchange between the grating emitter and the TPV cell. A parametric study is performed by varying the grating depth, period, and ridge width in the range that can be fabricated using available fabrication technologies. It is found that the power output can be increased by 40% while improving the efficiency from 29.9% to 32.0% with a selected grating emitter as compared to the case of a flat tungsten emitter. Reasons for the enhancement are found to be due to the enhanced energy transmission coefficient close to the band gap. Furthermore, this work shows a possible way of improving NFTPV and sheds light on how grating structures interact with thermal radiation at the nanoscale.},
doi = {10.1115/1.4035356},
url = {https://www.osti.gov/biblio/1594750}, journal = {Journal of Heat Transfer},
issn = {0022-1481},
number = 5,
volume = 139,
place = {United States},
year = {2017},
month = {2}
}

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Cited by: 11 works
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Works referenced in this record:

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    Effect of Evanescent Waves on the Dark Current of Thermophotovoltaic Cells
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    Effect of Evanescent Waves on the Dark Current of Thermophotovoltaic Cells
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    Near-Field Thermal Radiation between Nanostructures of Natural Anisotropic Material
    journal, September 2018


    Near-field radiative thermoelectric energy converters: a review
    journal, December 2017


    Micron-sized liquid nitrogen-cooled indium antimonide photovoltaic cell for near-field thermophotovoltaics
    journal, January 2019