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Preparation and ultrafast carrier dynamics of semiconductor nanoparticles

Research Project

Project/Area Number 15510098
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nanomaterials/Nanobioscience
Research InstitutionThe University of Electro-Communications

Principal Investigator

TOYODA Taro  The University of Electro-Communications, Faculty of Electro-Communications, Professor, 電気通信学部, 教授 (40217576)

Co-Investigator(Kenkyū-buntansha) QING Shen  The University of Electro-Communications, Faculty of Electro-Communications, Research Associate, 電気通信学部, 助手 (50282926)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2003: ¥1,700,000 (Direct Cost: ¥1,700,000)
Keywordssemiconductor nanoparticles / TiO_2 nanoparticles / ZnS nanoparticles / photovoltaic phenomena / luminescence properties / photoacoustic spectrum / photoelectrochemica spectrum / transient characterization / 光電変換 / 光音響法 / 光化学電流法 / TiO_2ナノ粒子 / SnO_2ナノ粒子 / ZnOナノ粒子 / 複合化ナノ粒子 / 光吸収 / 光電流 / 光電流過度応答
Research Abstract

Significant progress in solar cell application has been made since 1990's using nanostructured TiO_2 electrodes adsorbed with organic dyes (DSSC). In addition to organic dyes, semiconductor quantum dots (QDs) have also attracted much interest as light harvesters in DSSC. In this study, we prepared nanostructured TiO_2 electrodes with different morphologies. We adsorbed CdSe QDs onto the electrodes as photosensitizers. Characterization by photoacoustic (PA), photoelectrochemical current (PEC), and transient grating (TG) methods were applied. Redshoft of the PA spectrum with the increase of CdSe QDs adsorption time can be clearly observed and the PEC spectrum showed the photosensitization in the visible region resulting from the QDs adsorption. The decay time of excited electrons in the CdSe QDs was different with each nanostructured TiO_2 electrodes with different morphologies, reflecting the difference of crystal growth of CdSe QDs on each nanostructured TiO_2 electrodes.
Research involving Mn doped annocrystalline ZnS (ZnS : Mn) has grown in recent years, partly due to the high quantum luminescence efficiencies. We measured PA, photoluminescence (PL), and the PL excitation (PLE) spectra of surface-passivated and unpassivated ZnS : Mn. The effects of ultraviolet (UV) irradiation on the PL and PLE spectra were also studied. A decrease of PA intensity after UV exposure was observed for ZnS : Mn, indicating a decrease in the nonradiative relaxation probability. The observed increase in PL intensity indicates a corresponding increase in the radiative transition probability.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (24 results)

All 2006 2005 2004 Other

All Journal Article (21 results) Publications (3 results)

  • [Journal Article] Photoexcited hole dynamics in TiO_2 nanocrystalline films characterized using a lens-free heterodyne detection transient grating technique2006

    • Author(s)
      Q.Shen
    • Journal Title

      Chemical Physics Letters 419

      Pages: 464-468

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The effect of ultraviolet irradiation on the photothermal and photoluminescence excitation spectra of Mn-doped ZnS nanoparticles2006

    • Author(s)
      A.B.Cruz
    • Journal Title

      Thin Solid Films 499

      Pages: 104-109

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Photoacoustic and photoclectrochemical characterization of CdSe-sensitized TiO_2 electrodes composed of nanotubes and nanowires2006

    • Author(s)
      Q.Shen
    • Journal Title

      Thin Solid Films 499

      Pages: 299-305

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Photoacoustic and photoelectrochemical characterization of inverse opal TiO_2 sensitized with CdSe quantum dots2006

    • Author(s)
      L.J.Diguna
    • Journal Title

      Japanese Journal of Applied Physics 45

      Pages: 5563-5568

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Optical absorption, photoelectrochemical, and ultrafast carrier dynamic characterization of TiO_2 electrodes composed of nanotubes and nanowires sensitized with CdSe quantum dots2006

    • Author(s)
      Q.Shen
    • Journal Title

      Japanese Journal of Applied Physics 45

      Pages: 5569-5574

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Photoacoustic and photoelectrochemical characterization of CdS-sensitized TiO_2 electrodes composed of nanotubes and nanowires2006

    • Author(s)
      Q.Shen
    • Journal Title

      Thin Solid Films 499

      Pages: 299-305

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Optical absorption, photoelectrochemical, and ultrafast carrier dynamic characterization of TiO_2 electrodes composed of nanotubes and nanowires2006

    • Author(s)
      Q.Shen
    • Journal Title

      Japanese Journal of Applied Physics 45

      Pages: 5569-5574

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Photoexcited hole dynamics of TiO_2 nanocrustalline films characterized using a lens-free heteridyne detection transient grating technique.2006

    • Author(s)
      Q.Shen
    • Journal Title

      Chemical Physics Letters 419

      Pages: 464-468

    • Related Report
      2005 Annual Research Report
  • [Journal Article] The effect of ultraviolet irradiation on the photothermal, photoluminescence and photoluminescence excitation spectra of MN-doped ZnS nanoparticles.2006

    • Author(s)
      A.B.Cruz
    • Journal Title

      Thin Solid Films 499

      Pages: 104-109

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Photoacoustic and photoelectrochemical characterization of CdSe quantum dots grafted onto fluorine-doped tin oxide (FTO substrate.2005

    • Author(s)
      T.Toyoda
    • Journal Title

      Japanese Journal of Applied Physics 44

      Pages: 4465-4468

    • NAID

      10016584453

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effect of rutile-type content on nanostructured anatase-type TiO_2 electrodes sensitized with CdSe quantum dots characterized with photoacoustic and photoelectrochemical current spectroscopies.2005

    • Author(s)
      T.Toyoda
    • Journal Title

      Materials Science and Engineering C 25

      Pages: 853-857

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Study of ultrafast carrier dynamics of nanostructured TiO_2 films with and without CdSe quantum dot deposition using lens-free heterodyne detection transient grating technique.2005

    • Author(s)
      Q.Shen
    • Journal Title

      Thin Solid Films 486

      Pages: 15-19

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Photoacoustic and photoluminescence characterization of passivated and unpassivated Mn-doped ZnS nanoparticles.2005

    • Author(s)
      A.B.Cruz
    • Journal Title

      Japanese Journal of Applied Physics 44

      Pages: 4354-4357

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Study of ultrafast carrier dynamics of nanostructured TiO_2 films with and without CdSe quantum dot deposition using lens-free-heterodyne detection transient …….2005

    • Author(s)
      Q.Shen
    • Journal Title

      Thin Solid Films in press

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Photoacoustic and photoelectrochemical characterization of CdSe-sensitized TiO_2 electrodes composed of nanotubes and nanowires.2005

    • Author(s)
      Q.Shen
    • Journal Title

      Thin Solid Films in press

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Photoacoustic and photoelectrochemical characterization of CdSe quantum dots grafted onto fluorine-doped tin oxide (FTO) substrate.2005

    • Author(s)
      T.Toyoda
    • Journal Title

      Japanese Journal of Applied Physics in press

    • NAID

      10016584453

    • Related Report
      2004 Annual Research Report
  • [Journal Article] The effect of ultraviolet irradiation on the photothermal, photoluminescence and photoluminescence excitation spectra of Mn-doped ZnS nanoparticles.2005

    • Author(s)
      A.B.Cruz
    • Journal Title

      Thin Solid Films in press

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Characterization of nanostructured TiO_2 electrodes sensitized with CdSe quantum dots using photoacoustic and photoelectrochemical current methods2004

    • Author(s)
      Q.Shen
    • Journal Title

      Japanese Journal of Appleid Physics 43

      Pages: 2946-2951

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Photosensitization of nanostructured TiO_2 with CdSe quantum dots : effects of microstructure and electron transport in TiO_2 substrates.2004

    • Author(s)
      Q.Shen
    • Journal Title

      Journal of Photochemistry and Photobiology A : Chemistry 164

      Pages: 75-80

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Optical absorption and ultrafast carrier dynamics characterization of CdSe quantum dots deposited on different morphologies of nanostructured TiO_2 films

    • Author(s)
      L.J.Diguna
    • Journal Title

      Materials Science and Engineering C (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Optical absorption and ultrafast carrier dynamics chracterization of CdSe quantum dots deposited on different morphologies of nanostrsuctured TiO_2 films

    • Author(s)
      L.J.Diguna
    • Journal Title

      Materials Science and Engineering C (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Publications] T.Toyoda: "Photoacoustic and Photoelectrochemical Response of Nanostructured TiO_2 Electrocles."Japanese Journal of Applied Physics. 42. 3036-3040 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Toyoda: "Irradiation Time Dependence of Mn-doped ZnS Nanocrystals with Oerboxylic Acid on Radiative and Non-radiative Transitions."Thin Solid Films. 438-439. 132-136 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] O.Shen: "Studies of Optical Absorption and Electron Transport in Nanocrystalline TiO_2 Electrodes."Thin Solid Films. 438-439. 167-170 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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