Electrolyte/Dye/TiO₂ Interfacial Structures of Dye-Sensitized Solar Cells Revealed by In Situ Neutron Reflectometry...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• The interfacial structure in device assemblies is critical for function.
• Dye/TiO2 interfaces in dye-sensitized solar cells (DSCs) determine photovoltaic output.
• Ex situ characterization methods do not fully capture in-device interfacial behavior.

Purpose of the Study:

• To probe electrolyte/dye/TiO2 interfacial structures in situ within a DSC.
• To understand how electrolyte ions influence the dye/TiO2 interface.
• To correlate structural changes with DSC operational processes.

Main Methods:

• In situ neutron reflectometry with contrast matching.
• Characterization of buried interfaces within a functional DSC.
• Analysis of electrolyte constituent ingress into dye monolayers.

Main Results:

• Resolved electrolyte/dye/TiO2 interfacial structures within the DSC.
• Observed electrolyte constituents ingress into the dye self-assembled monolayer.
• Identified modulation of dye/TiO2 anchoring by electrolyte/dye interactions.

Conclusions:

• In situ structural determination is crucial for understanding DSC function.
• Electrolyte-dye interactions significantly influence interfacial structure.
• Structural changes impact key DSC processes like dye regeneration and electron injection.