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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 17 — Aug. 26, 2013
  • pp: 20111–20118

Enhancement of broadband optical absorption in photovoltaic devices by band-edge effect of photonic crystals

Yoshinori Tanaka, Yosuke Kawamoto, Masayuki Fujita, and Susumu Noda  »View Author Affiliations


Optics Express, Vol. 21, Issue 17, pp. 20111-20118 (2013)
http://dx.doi.org/10.1364/OE.21.020111


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Abstract

We numerically investigate broadband optical absorption enhancement in thin, 400-nm thick microcrystalline silicon (µc-Si) photovoltaic devices by photonic crystals (PCs). We realize absorption enhancement by coupling the light from the free space to the large area resonant modes at the photonic band-edge induced by the photonic crystals. We show that multiple photonic band-edge modes can be produced by higher order modes in the vertical direction of the Si photovoltaic layer, which can enhance the absorption on multiple wavelengths. Moreover, we reveal that the photonic superlattice structure can produce more photonic band-edge modes that lead to further optical absorption. The absorption average in wavelengths of 500-1000 nm weighted to the solar spectrum (AM 1.5) increases almost twice: from 33% without photonic crystal to 58% with a 4 × 4 period superlattice photonic crystal; our result outperforms the Lambertian textured structure.

© 2013 OSA

OCIS Codes
(040.5350) Detectors : Photovoltaic
(350.6050) Other areas of optics : Solar energy
(230.5298) Optical devices : Photonic crystals

ToC Category:
Solar Energy

History
Original Manuscript: April 9, 2013
Revised Manuscript: July 19, 2013
Manuscript Accepted: August 5, 2013
Published: August 20, 2013

Citation
Yoshinori Tanaka, Yosuke Kawamoto, Masayuki Fujita, and Susumu Noda, "Enhancement of broadband optical absorption in photovoltaic devices by band-edge effect of photonic crystals," Opt. Express 21, 20111-20118 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-17-20111


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