Patterned dielectric back contact design for GaAs thermophotovoltaic devices

-Patterned-dielectric back contact structures in optoelectronic devices are designed to boost the reflectance of light from the device back surface while retaining a low-resistance pathway for electrical conductance. Their reduced light absorption at near- and sub-bandgap photon energies leads to im...

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Vydáno v:Solar energy materials and solar cells Ročník 281
Hlavní autoři: Arulanandam, Madhan K., Buencuerpo, Jeronimo, Steiner, Myles A., Kuritzky, Leah Y., Young, Alexandra R., Tervo, Eric J., Perl, Emmett E., Kayes, Brendan M., Briggs, Justin A., King, Richard R.
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States Elsevier 25.11.2024
Témata:
diffraction grating
efficiency
GaAs
patterned dielectric back contact
rigorous coupled wave analysis
SOLAR ENERGY
sub-bandgap spectrum
thermophotovoltaics
ISSN:0927-0248
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Shrnutí:-Patterned-dielectric back contact structures in optoelectronic devices are designed to boost the reflectance of light from the device back surface while retaining a low-resistance pathway for electrical conductance. Their reduced light absorption at near- and sub-bandgap photon energies leads to improved luminescence in light-emitting diodes, greater photon recycling, voltage, and efficiency in photovoltaic cells, and greater recuperation of unabsorbed sub-bandgap light in thermophotovoltaic (TPV) systems. However, diffraction from the patterned features can deflect incident light in propagation directions that lead to light trapping and parasitic absorption in the cell. Here, in this article, we use rigorous coupled-wave analysis (RCWA) to study three-dimensional diffractive scattering of electromagnetic waves by periodic metal point-contact gratings on 1.42-eV GaAs TPV cells, to analyze their effect on unwanted sub-bandgap absorption in order to achieve higher TPV system efficiency. Solutions of Maxwell's equations calculated using RCWA are compared to measured sub-bandgap reflectance in experimental GaAs TPV devices with varying metal point-contact diameters and spacing. Modeling and experiments indicate decreased total reflectance due to these diffractive effects for a small point contact diameter of 1 μm, and this effect is much stronger at higher contact coverage fractions.
Bibliografie:USDOE Office of Energy Efficiency and Renewable Energy (EERE)
AR0000993; AC36-08GO28308
NREL/JA--5900-92417
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
ISSN:0927-0248
DOI:10.1016/j.solmat.2024.113285