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Journal of Applied Physics / Volume 110 / Issue 1 / ARTICLES / Nanoscale Science and Design

J. Appl. Phys. 110, 014314 (2011); http://dx.doi.org/10.1063/1.3605486 (7 pages)

Energy transfer versus charge separation in hybrid systems of semiconductor quantum dots and Ru-dyes as potential co-sensitizers of TiO2-based solar cells

Sixto Giménez1, Andrey L. Rogach2, Andrey A. Lutich3, Dieter Gross3, Andreas Poeschl3, Andrei S. Susha2, Ivan Mora-Seró1, Teresa Lana-Villarreal4, and Juan Bisquert1

1Grup de dispositius Fotovoltaics i Optoelectrònics, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
2Department of Physics and Materials Science and Centre for Functional Photonics (CFP), City Universtiy of Hong Kong, Tat Chee Avenue, Hong Kong
3Photonics and Optoelectronics Group, Physics Department and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität München, Amalienstr. 54, D-80799 Munich, Germany
4Departament de Química-Física i Institut Universitari d’Electroquímica, Universitat d’Alacant, Ap. 99, E-03080 Alacant, Spain

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(Received 13 April 2011; accepted 6 June 2011; published online 14 July 2011)

Hybrid structures of colloidal quantum dots (QDs) with Ru-dyes have been studied as candidates for panchromatic sensitizers for TiO2-based solar cells. Steady-state and time resolved photoluminescence spectroscopy and photocurrent measurements have been employed to identify the prevailing transfer mechanisms for photogenerated excitons between CdSe QDs capped with a traditional bulky organic ligand trioctylphosphine and Ru-dyes (N3 or Ru505) deposited onto inert glass or mesoporous TiO2 substrates. The type II energy level alignment between the QDs and both N3 and Ru505 offers a possibility for the directional charge separation, with electrons transferred to the QDs and holes to the dye. This scenario is indeed valid for the QD/Ru505 and TiO2/QD/Ru505 hybrid systems, with the negligible spectral overlap between the emission of the QDs and the absorption of the Ru505 dye. For the QD/N3 and TiO2/QD/N3 hybrid systems, the spectral overlap favors the longer range energy transfer from the QDs to N3, independently of the presence of the electron acceptor TiO2.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SECTION
  3. RESULTS AND DISCUSSION
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

cadmium compounds, dyes, excitons, II-VI semiconductors, photoconductivity, photoluminescence, semiconductor materials, semiconductor quantum dots, solar cells, time resolved spectra, wide band gap semiconductors

PACS

  • 88.40.jm

    Thin film III-V and II-VI based solar cells

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3605486

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    L. J. Diguna, Q. Shen, J. Kobayashi, and T. Toyoda, Appl. Phys. Lett. 91, 0231161 (2007)APPLAB000091000002023116000001.

    S. Q. Fan, B. Fang, J. H. Kim, J. J. Kim, J. S. Yu, and J. Ko, Appl. Phys. Lett. 96, 063501 (2010)APPLAB000096000006063501000001.

    S. Giménez, T. Lana-Villarreal, R. Gómez, S. Agouram, V. Muñoz-Sanjosé, and I. Mora-Seró, J. Appl. Phys. 108, 064310 (2010)JAPIAU000108000006064310000001.


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