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Title: Omnidirectional and broadband absorption enhancement from trapezoidal Mie resonators in semiconductor metasurfaces

Abstract

Light trapping in planar ultrathin-film solar cells is limited due to a small number of optical modes available in the thin-film slab. A nanostructured thin-film design could surpass this limit by providing broadband increase in the local density of states in a subwavelength volume and maintaining efficient coupling of light. Here we report a broadband metasurface design, enabling efficient and broadband absorption enhancement by direct coupling of incoming light to resonant modes of subwavelength scale Mie nanoresonators defined in the thin-film active layer. Absorption was investigated both theoretically and experimentally in prototypes consisting of lithographically patterned, two-dimensional periodic arrays of silicon nanoresonators on silica substrates. A crossed trapezoid resonator shape of rectangular cross section is used to excite broadband Mie resonances across visible and near-IR spectra. Our numerical simulations, optical absorption measurements and photocurrent spectral response measurements demonstrate that crossed trapezoidal Mie resonant structures enable angle-insensitive, broadband absorption. A short circuit current density of 12.0 mA/cm2 is achieved in 210 nm thick patterned Si films, yielding a 4-fold increase compared to planar films of the same thickness. As a result, it is suggested that silicon metasurfaces with Mie resonator arrays can provide useful insights to guide future ultrathin-film solar cellmore » designs incorporating nanostructured thin active layers.« less

Authors:
 [1];  [2];  [2];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Northwestern Univ., Evanston, IL (United States)
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1434484
Grant/Contract Number:  
SC0001293
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; Devices for energy harvesting; Metamaterials; Nanophotonics and plasmonics

Citation Formats

Pala, Ragip A., Butun, Serkan, Aydin, Koray, and Atwater, Harry A.. Omnidirectional and broadband absorption enhancement from trapezoidal Mie resonators in semiconductor metasurfaces. United States: N. p., 2016. Web. https://doi.org/10.1038/srep31451.
Pala, Ragip A., Butun, Serkan, Aydin, Koray, & Atwater, Harry A.. Omnidirectional and broadband absorption enhancement from trapezoidal Mie resonators in semiconductor metasurfaces. United States. https://doi.org/10.1038/srep31451
Pala, Ragip A., Butun, Serkan, Aydin, Koray, and Atwater, Harry A.. Mon . "Omnidirectional and broadband absorption enhancement from trapezoidal Mie resonators in semiconductor metasurfaces". United States. https://doi.org/10.1038/srep31451. https://www.osti.gov/servlets/purl/1434484.
@article{osti_1434484,
title = {Omnidirectional and broadband absorption enhancement from trapezoidal Mie resonators in semiconductor metasurfaces},
author = {Pala, Ragip A. and Butun, Serkan and Aydin, Koray and Atwater, Harry A.},
abstractNote = {Light trapping in planar ultrathin-film solar cells is limited due to a small number of optical modes available in the thin-film slab. A nanostructured thin-film design could surpass this limit by providing broadband increase in the local density of states in a subwavelength volume and maintaining efficient coupling of light. Here we report a broadband metasurface design, enabling efficient and broadband absorption enhancement by direct coupling of incoming light to resonant modes of subwavelength scale Mie nanoresonators defined in the thin-film active layer. Absorption was investigated both theoretically and experimentally in prototypes consisting of lithographically patterned, two-dimensional periodic arrays of silicon nanoresonators on silica substrates. A crossed trapezoid resonator shape of rectangular cross section is used to excite broadband Mie resonances across visible and near-IR spectra. Our numerical simulations, optical absorption measurements and photocurrent spectral response measurements demonstrate that crossed trapezoidal Mie resonant structures enable angle-insensitive, broadband absorption. A short circuit current density of 12.0 mA/cm2 is achieved in 210 nm thick patterned Si films, yielding a 4-fold increase compared to planar films of the same thickness. As a result, it is suggested that silicon metasurfaces with Mie resonator arrays can provide useful insights to guide future ultrathin-film solar cell designs incorporating nanostructured thin active layers.},
doi = {10.1038/srep31451},
journal = {Scientific Reports},
number = 1,
volume = 6,
place = {United States},
year = {2016},
month = {9}
}

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Cited by: 9 works
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    Works referencing / citing this record:

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