Dual-functional CeO2:Eu3+ nanocrystals for performance-enhanced dye-sensitized solar cells

Area of Science:

• Materials Science
• Nanotechnology
• Photovoltaics

Background:

• Dye-sensitized solar cells (DSSCs) require efficient light harvesting.
• Enhancing light absorption and utilization is crucial for improving DSSC performance.

Purpose of the Study:

• To investigate the photovoltaic properties of single-crystalline, octahedral CeO2:Eu3+ nanocrystals.
• To enhance the light-harvesting efficiency of DSSCs using these novel nanocrystals.

Main Methods:

• Hydrothermal synthesis of single-crystalline, octahedral CeO2:Eu3+ nanocrystals.
• Characterization of nanocrystal size (300-400 nm) and optical properties.
• Fabrication and testing of DSSCs incorporating CeO2:Eu3+ nanocrystals.

Main Results:

• CeO2:Eu3+ nanocrystals exhibited improved diffuse reflectance of visible light.
• Downconversion photoluminescence was observed upon UV excitation (330 nm), with dominant emission at 590 nm for 1 mol % Eu3+ doping.
• DSSC power conversion efficiency increased by 14% (to 8.36%) compared to conventional TiO2 nanoparticle-based DSSCs.

Conclusions:

• The unique properties of CeO2:Eu3+ nanocrystals, including light scattering and downconversion photoluminescence, significantly boost DSSC performance.
• These nanocrystals offer a promising approach for developing next-generation, highly efficient solar cells.