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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S2 — Mar. 10, 2014
  • pp: A311–A319

Optimization and analysis of 3D nanostructures for power-density enhancement in ultra-thin photovoltaics under oblique illumination

Bing Shen, Peng Wang, and Rajesh Menon  »View Author Affiliations


Optics Express, Vol. 22, Issue S2, pp. A311-A319 (2014)
http://dx.doi.org/10.1364/OE.22.00A311


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Abstract

Nanostructures have the potential to significantly increase the output power-density of ultra-thin photovoltaic devices by scattering incident sunlight into resonant guided modes. We applied a modified version of the direct-binary-search algorithm to design such nanostructures in order to maximize the output power-density under oblique-illumination conditions. We show that with appropriate design of nanostructured cladding layers, it is possible for a 10nm-thick organic absorber to produce an average peak power-density of 4mW/cm2 with incident polar angle ranging from −90° to 90° and incident azimuthal angle ranging from −23.5° to 23.5°. Using careful modal and spectral analysis, we further show that an optimal trade-off of absorption at λ~510nm among various angles of incidence is essential to excellent performance under oblique illumination. Finally, we show that the optimized device with no sun tracking can produce on an average 7.23 times more energy per year than that produced by a comparable unpatterned device with an optimal anti-reflection coating.

© 2014 Optical Society of America

OCIS Codes
(350.6050) Other areas of optics : Solar energy
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Light Trapping for Photovoltaics

History
Original Manuscript: October 14, 2013
Revised Manuscript: January 17, 2014
Manuscript Accepted: February 3, 2014
Published: February 10, 2014

Citation
Bing Shen, Peng Wang, and Rajesh Menon, "Optimization and analysis of 3D nanostructures for power-density enhancement in ultra-thin photovoltaics under oblique illumination," Opt. Express 22, A311-A319 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S2-A311


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