Efficient light harvesting using simple porphyrin-oxide perovskite system

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Barium Stannate (BaSnO3) is explored as a photoanode material for dye-sensitized solar cells (DSSCs).
• Optimizing BaSnO3 properties is crucial for enhancing solar cell performance.

Purpose of the Study:

• To investigate the impact of vacuum annealing on Barium Stannate (BaSnO3) microrods for DSSC applications.
• To analyze the electrical, optical, and adsorption properties of annealed BaSnO3 films.
• To improve the efficiency of porphyrin dye-sensitized solar cells using modified BaSnO3 photoanodes.

Main Methods:

• Systematic studies on phase-pure polycrystalline Barium Stannate (BaSnO3) microrods.
• Vacuum annealing of BaSnO3 thin films.
• Characterization using X-ray Photoelectron Spectroscopy (XPS), UV-Visible spectroscopy (UV-Vis), photoluminescence, and adsorption isotherm studies.
• Fabrication and testing of dye-sensitized solar cells (DSSCs) with treated BaSnO3 photoanodes.

Main Results:

• Vacuum annealing increased oxygen vacancies in BaSnO3, enhancing room temperature electron mobility from 49.1 to 82.4 cm²/V·sec.
• The macroporous structure of BaSnO3 facilitated faster dye adsorption (approx. 30 min).
• DSSC efficiency increased significantly, reaching 6.1% with annealed films compared to 4.7% for unannealed films, alongside improved current density and fill factor (FF).

Conclusions:

• Vacuum annealing is an effective method to improve the performance of Barium Stannate (BaSnO3) photoanodes in dye-sensitized solar cells (DSSCs).
• The enhanced electron mobility and dye adsorption properties contribute to a substantial increase in DSSC efficiency (84% improvement).
• Macroporous, phase-pure BaSnO3 nanostructures with induced oxygen vacancies show potential for use with unconventional dyes like metallized-porphyrins.