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Quantum dot sensitized solar cells with improved efficiency prepared using electrophoretic deposition.

Asaf Salant1, Menny Shalom, Idan Hod

  • 1Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University, Jerusalem 91904, Israel.

ACS Nano
|September 28, 2010
PubMed
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We developed a simple method to create quantum dot solar cells (QDSSC) using electrophoretic deposition. This technique enhances device stability and efficiency, offering a promising alternative for next-generation solar energy technologies.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Photovoltaics

Background:

  • Quantum dot sensitized solar cells (QDSSC) offer tunable optical properties and improved stability over organic sensitizers.
  • Controlling quantum dot (QD) size and composition is key to optimizing their performance.
  • Developing facile and efficient fabrication methods for QDSSCs is crucial for their commercialization.

Purpose of the Study:

  • To report a facile fabrication method for QDSSCs using electrophoretic deposition of Cadmium Selenide (CdSe) quantum dots.
  • To investigate the influence of QD size and morphology on deposition and device performance.
  • To compare the efficiency and stability of QDSSCs prepared by electrophoretic deposition with those from linker-based methods.

Main Methods:

  • Electrophoretic deposition of CdSe quantum dots (QDs) onto mesoporous Titanium Dioxide (TiO2) coated electrodes.

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  • Fabrication of QDSSCs without prior TiO2 pretreatment, with deposition times as short as 2 hours.
  • Characterization of QD deposition across the TiO2 layer and photovoltaic performance evaluation of fabricated devices, including post-treatment with Zinc Sulfide (ZnS).

    • Main Results:

    • Effective coating of mesoporous TiO2 with CdSe QDs (2.5-5.5 nm) and quantum rods via electrophoretic deposition in under 2 hours.
    • Achieved power conversion efficiencies up to 1.7% under 1-sun illumination after ZnS treatment, outperforming linker-based methods.
    • Observed efficient electron injection across various QD sizes, with absorbed photon to electron conversion efficiencies showing no clear size-dependence.

    Conclusions:

    • Electrophoretic deposition provides a rapid, efficient, and versatile method for fabricating QDSSCs.
    • The method allows for tuning QD properties through size and composition, leading to improved device performance.
    • This approach is scalable and applicable to a wide range of colloidal quantum dot and quantum rod materials for solar cell applications.