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2010 Fiscal Year Final Research Report

Influence of sensitizers on charge recombination in dye-sensitized solar cells

Research Project

  • PDF
Project/Area Number 21750015
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Physical chemistry
Research InstitutionShinshu University

Principal Investigator

MORI Shogo  Shinshu University, 繊維学部, 准教授 (10419418)

Project Period (FY) 2009 – 2010
Keywords光物性 / ナノ材料
Research Abstract

The objectives of this study are to elucidate the effect of dye structures on the charge recombination in dye-sensitized solar cells (DSCs) and to propose the design guide for new sensitizers. The electron lifetime was measured for DSCs with dyes whose structures were systematically varied. It was found that the observed trends in the measured lifetime were explained by three factors : (1) blocking effect, (2) partial charges, and (3) dispersion forces. The blocking effect was controlled by the molecular size of the dyes and the density of adsorbed dyes. The partial charges mean how much charges are localized on particular atoms, e.g., oxygen and metal atoms. The dispersion force is determined by polarizability of sensitizers. Previously the effect of the dispersion force was not evident. This was because the effect was smaller than the others. Under the conditions that the effects of blocking effect and partial charges were little, the effect of dispersion force appeared. Based on the results, design guide for the dyes to retard recombination is to increase the adsorption density, to have little partial charges or leave those far from the surface of the TiO2, and to add obstacle moiety to the framework of the sensitizers. It was also effective to employ bulky redox couples to enhance the blocking effect.

  • Research Products

    (3 results)

All 2011 2010 2009

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (1 results)

  • [Journal Article] Concerted effect of large molecular dyes and bulky cobalt complex redox couple to retard recombination in dye-sensitized solar cells2011

    • Author(s)
      Masayoshi Ohta, Nagatoshi Koumura, Kohjiro Hara, Shogo Mori
    • Journal Title

      Electrochem.Commun in press

    • Peer Reviewed
  • [Journal Article] Molecular Design of Organic Dye toward Retardation of Charge Recombination at Semiconductor/dye/electrolyte Interface: Introduction of Twisted i-linker J.Phys.Chem.C2010

    • Author(s)
      Jun-ichi Nishida, Tatsuya Masuko, Yan Cui, Kohjiro Hara, Hideshi Shibuya, Manabu Ihara, Tomohiro Hosoyama, Ryota Goto, Shogo Mori, Yoshiro Yamashita
    • Journal Title

      114

      Pages: 17920-17925

    • Peer Reviewed
  • [Presentation] Charge Recombination in Dye-Sensitized Solar Cells: Effect of Dye Structure HOPV09 Assisi2009

    • Author(s)
      Shogo Mori
    • Place of Presentation
      Italy
    • Year and Date
      2009-05-25

URL: 

Published: 2012-02-13   Modified: 2016-04-21  

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