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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S3 — May. 6, 2013
  • pp: A305–A312

Geometric light trapping with a V-trap for efficient organic solar cells

Soo Jin Kim, George Y. Margulis, Seung-Bum Rim, Mark L. Brongersma, Michael D. McGehee, and Peter Peumans  »View Author Affiliations

Optics Express, Vol. 21, Issue S3, pp. A305-A312 (2013)

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The efficiency of today’s most efficient organic solar cells is primarily limited by the ability of the active layer to absorb all the sunlight. While internal quantum efficiencies exceeding 90% are common, the external quantum efficiency rarely exceeds 70%. Light trapping techniques that increase the ability of a given active layer to absorb light are common in inorganic solar cells but have only been applied to organic solar cells with limited success. Here, we analyze the light trapping mechanism for a cell with a V-shape substrate configuration and demonstrate significantly improved photon absorption in an 5.3%-efficient PCDTBT:PC70BM bulk heterojunction polymer solar cell. The measured short circuit current density improves by 29%, in agreement with model predictions, and the power conversion efficiency increases to 7.2%, a 35% improvement over the performance in the absence of a light trap.

© 2013 OSA

OCIS Codes
(350.0350) Other areas of optics : Other areas of optics
(350.6050) Other areas of optics : Solar energy

ToC Category:

Original Manuscript: January 22, 2013
Revised Manuscript: February 23, 2013
Manuscript Accepted: February 26, 2013
Published: March 14, 2013

Virtual Issues
April 19, 2013 Spotlight on Optics

Soo Jin Kim, George Y. Margulis, Seung-Bum Rim, Mark L. Brongersma, Michael D. McGehee, and Peter Peumans, "Geometric light trapping with a V-trap for efficient organic solar cells," Opt. Express 21, A305-A312 (2013)

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