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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S3 — May. 5, 2014
  • pp: A867–A879

Enhanced power conversion efficiency of quantum dot sensitized solar cells with near single-crystalline TiO2 nanohelixes used as photoanodes

Seung Hee Lee, Ho Jin, Dong-Yeong Kim, Kyung Song, Sang Ho Oh, Sungjee Kim, E. Fred Schubert, and Jong Kyu Kim  »View Author Affiliations


Optics Express, Vol. 22, Issue S3, pp. A867-A879 (2014)
http://dx.doi.org/10.1364/OE.22.00A867


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Abstract

Photo-electrodes with tailored three-dimensional nanostructures offer a large enhancement in light harvesting capability for various optoelectronic devices enabled by strong light scattering in the nanostructures as well as improved charge transport. Here we present an array of three-dimensional titanium dioxide (TiO2) nanohelixes fabricated by the oblique angle deposition method as a multifunctional photoanode for CdSe quantum dot sensitized solar cells (QDSSCs). The CdSe QDSSC with a TiO2 nanohelix photoanode shows a 100% higher power conversion efficiency despite less light being absorbed in CdSe QDs when compared with a conventional TiO2 nanoparticle photoanode. We attribute the higher power conversion efficiency to strong light scattering by the TiO2 nanohelixes and much enhanced transport and collection of photo-generated carriers enabled by the unique geometry and near-single crystallinity of the TiO2 nanohelix structure.

© 2014 Optical Society of America

OCIS Codes
(230.0230) Optical devices : Optical devices
(230.0250) Optical devices : Optoelectronics

ToC Category:
Photovoltaics

History
Original Manuscript: January 28, 2014
Revised Manuscript: March 31, 2014
Manuscript Accepted: March 31, 2014
Published: April 11, 2014

Citation
Seung Hee Lee, Ho Jin, Dong-Yeong Kim, Kyung Song, Sang Ho Oh, Sungjee Kim, E. Fred Schubert, and Jong Kyu Kim, "Enhanced power conversion efficiency of quantum dot sensitized solar cells with near single-crystalline TiO2 nanohelixes used as photoanodes," Opt. Express 22, A867-A879 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S3-A867


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