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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S3 — May. 5, 2014
  • pp: A992–A1000

Laterally assembled nanowires for ultrathin broadband solar absorbers

Kyung-Deok Song, Thomas J. Kempa, Hong-Gyu Park, and Sun-Kyung Kim  »View Author Affiliations


Optics Express, Vol. 22, Issue S3, pp. A992-A1000 (2014)
http://dx.doi.org/10.1364/OE.22.00A992


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Abstract

We studied optical resonances in laterally oriented Si nanowire arrays by conducting finite-difference time-domain simulations. Localized Fabry-Perot and whispering-gallery modes are supported within the cross section of each nanowire in the array and result in broadband light absorption. Comparison of a nanowire array with a single nanowire shows that the current density (JSC) is preserved for a range of nanowire morphologies. The JSC of a nanowire array depends on the spacing of its constituent nanowires, which indicates that both diffraction and optical antenna effects contribute to light absorption. Furthermore, a vertically stacked nanowire array exhibits significantly enhanced light absorption because of the emergence of coupled cavity-waveguide modes and the mitigation of a screening effect. With the assumption of unity internal quantum efficiency, the JSC of an 800-nm-thick cross-stacked nanowire array is 14.0 mA/cm2, which yields a ~60% enhancement compared with an equivalent bulk film absorber. These numerical results underpin a rational design strategy for ultrathin solar absorbers based on assembled nanowire cavities.

© 2014 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(140.4780) Lasers and laser optics : Optical resonators
(350.6050) Other areas of optics : Solar energy

ToC Category:
Light Trapping for Photovoltaics

History
Original Manuscript: March 17, 2014
Revised Manuscript: April 16, 2014
Manuscript Accepted: April 16, 2014
Published: April 29, 2014

Citation
Kyung-Deok Song, Thomas J. Kempa, Hong-Gyu Park, and Sun-Kyung Kim, "Laterally assembled nanowires for ultrathin broadband solar absorbers," Opt. Express 22, A992-A1000 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S3-A992


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