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Related Concept Videos

P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Related Experiment Video

Updated: May 12, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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Bragg stack-functionalized counter electrode for solid-state dye-sensitized solar cells.

Jung Tae Park1, Jacob H Prosser, Dong Jun Kim

  • 1Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea.

Chemsuschem
|April 12, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a new counter electrode using alternating layers of mesoporous TiO(2) and SiO(2) nanoparticles to boost light harvesting in dye-sensitized solar cells (DSSCs). This advancement significantly enhances energy conversion efficiency in solid-state DSSCs.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Dye-sensitized solar cells (DSSCs) require efficient counter electrodes for optimal light harvesting and charge transfer.
  • Existing counter electrodes often face limitations in light management and can suffer from charge recombination or electrolyte leakage.
  • Developing advanced counter electrode materials is crucial for improving the performance and stability of solid-state DSSCs.

Purpose of the Study:

  • To engineer a highly reflective counter electrode using alternating layers of organized mesoporous TiO(2) (om-TiO(2)) and colloidal SiO(2) (col-SiO(2)) nanoparticles.
  • To investigate the impact of this Bragg stack (BS)-functionalized counter electrode on the light harvesting properties and overall efficiency of dye-sensitized solar cells.
  • To analyze the optical and electrochemical performance of the fabricated solid-state DSSCs (ssDSSCs) to understand the underlying mechanisms for improved energy conversion.

Main Methods:

  • Fabrication of om-TiO(2) layers via atomic transfer radical polymerization and sol-gel processes using a graft copolymer as a structure-directing agent.
  • Preparation of col-SiO(2) layers by spin-coating commercially available silica nanoparticles.
  • Characterization of the BS-functionalized counter electrode and ssDSSCs using techniques such as SEM, UV/Vis spectroscopy, incident photon-to-electron conversion efficiency, and electrochemical impedance spectroscopy.

Main Results:

  • The fabricated counter electrode exhibited high reflectivity due to the alternating high and low refractive index layers.
  • Incorporation of the BS-functionalized counter electrode into ssDSSCs with a polymerized ionic liquid electrolyte resulted in an energy conversion efficiency approaching 6.6%.
  • Optical and electrochemical analyses confirmed enhanced light harvesting without detrimental charge recombination or electrolyte penetration.

Conclusions:

  • The developed Bragg stack counter electrode effectively enhances light management in ssDSSCs.
  • The high energy conversion efficiency achieved demonstrates the potential of this approach for next-generation solar cells.
  • This strategy offers a promising pathway for designing advanced counter electrodes for improved solar energy harvesting and device performance.