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Related Experiment Video

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Digital Printing of Titanium Dioxide for Dye Sensitized Solar Cells
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POSS-Based Electrolyte for Efficient Solid-State Dye-Sensitized Solar Cells at Sub-Zero Temperatures.

Kai Lv1, Wei Zhang1, Lu Zhang1

  • 1Department of Chemistry, Lab of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University , 2205 Songhu Road, Shanghai 200438, P. R. China.

ACS Applied Materials & Interfaces
|February 11, 2016
PubMed
Summary
This summary is machine-generated.

New solid electrolytes for solid-state dye-sensitized solar cells (ssDSSCs) were developed using polyhedral oligomeric silsesquioxane (POSS). These electrolytes exhibit low glass transition temperatures (Tg) for efficient subzero-temperature operation.

Keywords:
POSSalkyl length effectdye-sensitized solar cellslow temperature operationsolid-state electrolyte

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Electrochemistry

Background:

  • Solid-state dye-sensitized solar cells (ssDSSCs) require solid electrolytes for low-temperature applications.
  • Developing electrolytes with low glass transition temperatures (Tg) is crucial for subzero operation.

Purpose of the Study:

  • To synthesize and investigate novel polyhedral oligomeric silsesquioxane (POSS)-based solid electrolytes.
  • To tune the glass transition temperature (Tg) by modifying alkyl chain lengths in imidazolium substituents.
  • To evaluate the impact of structural modifications on ionic conductivity, Tg, and photovoltaic performance.

Main Methods:

  • Synthesis of POSS-grafted imidazolium ionic conductors with varying alkyl chain lengths.
  • Measurement of glass transition temperature (Tg) using thermal analysis.
  • Assessment of ionic conductivity via electrochemical impedance spectroscopy.
  • Evaluation of photovoltaic performance in ssDSSCs at room temperature and subzero conditions.

Main Results:

  • POSS-based electrolytes with low Tg, as low as -8.8 °C, were successfully synthesized.
  • Ionic conductivity and power conversion efficiency generally increased with alkyl chain length.
  • The POSS grafted with methyl-substituted imidazolium showed the highest power conversion efficiency (6.98%) at room temperature.
  • An efficiency of 6.52% was maintained at -4 °C, demonstrating suitability for subzero applications.

Conclusions:

  • POSS-based solid electrolytes with tunable Tg are promising for low-temperature ssDSSCs.
  • The methyl-substituted imidazolium-POSS derivative offers excellent conductivity and stable performance at subzero temperatures.
  • This research paves the way for reliable ssDSSCs in cold environments.