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Synergistic Cosensitization and Redox-Triggered Interfacial Engineering for Efficient and Durable Solar Cells.

Heng Wu1,2, Laia Marín Moncusí1,3, Javier Perez Hernandez1

  • 1Institute of Chemical Research of Catalonia (ICIQ)-CERCA, Avinguda Països Catalans, 16, Tarragona 43007, Spain.

ACS Applied Materials & Interfaces
|April 28, 2026
PubMed
Summary

This study enhances dye-sensitized solar cells (DSCs) using cosensitization and redox-active interfacial engineering. The new strategy improves power conversion efficiency (PCE) and long-term operational stability under indoor lighting.

Keywords:
charge transfercosensitizationdye sensitized solar cellsexcited statehypervalent iodineinterfacial engineeringlong-term stability

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Dye-sensitized solar cells (DSCs) face challenges in achieving both high power conversion efficiency (PCE) and long-term stability.
  • Current strategies often struggle to balance performance with durability.

Purpose of the Study:

  • To develop a synergistic strategy combining cosensitization and redox-active interfacial engineering to improve DSC performance and durability.
  • To investigate the role of specific sensitizers and electrolyte additives in enhancing device characteristics.

Main Methods:

  • Utilized cosensitization with a narrow-energy-gap sensitizer (H4) and a blue-light-absorbing dye (H15).
  • Introduced a hypervalent iodine(III) compound (1-acetoxy-1,2-benziodoxol-3(1H)-one, IBA) into a cobalt-based electrolyte.
  • Analyzed the effects of IBA and its redox byproduct (2-iodobenzoic acid, IA) on interfacial charge dynamics and recombination.

Main Results:

  • Cosensitization compensated for spectral response and reduced charge recombination.
  • The IBA additive facilitated electron donor oxidation and enhanced intramolecular charge transfer.
  • The redox byproduct IA effectively suppressed interfacial recombination and passivated the interface.
  • Achieved a PCE of 12.84% for the cosensitized DSC with excellent operational stability (1000 h indoor light).
  • A control device demonstrated a high efficiency of 25.81% under indoor light (4500 lx).

Conclusions:

  • The synergistic combination of cosensitization and IBA-mediated interfacial engineering significantly enhances DSC performance and stability.
  • This approach offers a promising pathway for developing durable and efficient solar energy conversion devices for indoor applications.