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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 14 — Jul. 6, 2009
  • pp: 11944–11957

Nanoparticle Plasmonics for 2D-Photovoltaics: Mechanisms, Optimization, and Limits

Carl Hägglund and Bengt Kasemo  »View Author Affiliations


Optics Express, Vol. 17, Issue 14, pp. 11944-11957 (2009)
http://dx.doi.org/10.1364/OE.17.011944


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Abstract

Plasmonic nanostructures placed within or near photovoltaic (PV) layers are of high current interest for improving thin film solar cells. We demonstrate, by electrodynamics calculations, the feasibility of a new class of essentially two dimensional (2D) solar cells based on the very large optical cross sections of plasmonic nanoparticles. Conditions for inducing absorption in extremely thin PV layers via plasmon near-fields, are optimized in 2D-arrays of (i) core-shell particles, and (ii) plasmonic particles on planar layers. At the plasmon resonance, a pronounced optimum is found for the extinction coefficient of the PV material. We also characterize the influence of the dielectric environment, PV layer thickness and nanoparticle shape, size and spatial distribution. The response of the system is close to that of a 2D effective medium layer, and subject to a 50% absorption limit when the dielectric environment around the 2D layer is symmetric. In this case, a plasmon induced absorption of about 40% is demonstrated in PV layers as thin as 10 nm, using silver nanoparticle arrays of only 1 nm effective thickness. In an asymmetric environment, the useful absorption may be increased significantly for the same layer thicknesses. These new types of essentially 2D solar cells are concluded to have a large potential for reducing solar electricity costs.

© 2009 Optical Society of America

OCIS Codes
(040.5350) Detectors : Photovoltaic
(230.0230) Optical devices : Optical devices
(240.6680) Optics at surfaces : Surface plasmons
(260.0260) Physical optics : Physical optics
(350.6050) Other areas of optics : Solar energy
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Detectors

History
Original Manuscript: May 4, 2009
Revised Manuscript: June 23, 2009
Manuscript Accepted: June 24, 2009
Published: June 30, 2009

Citation
Carl Hägglund and Bengt Kasemo, "Nanoparticle Plasmonics for 2D-Photovoltaics: Mechanisms, Optimization, and Limits," Opt. Express 17, 11944-11957 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-14-11944


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