Cs₂SnI₆-Encapsulated Multidye-Sensitized All-Solid-State Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Dye-sensitized solar cells (DSSCs) are a promising photovoltaic technology.
• Optimizing light harvesting and charge transport is crucial for improving DSSC performance.
• Simultaneous use of multiple dyes can broaden spectral absorption.

Purpose of the Study:

• To investigate the synergistic effects of combining multiple dyes in DSSCs.
• To enhance light capture across the solar spectrum using complementary absorbers.
• To develop a stable, all-solid-state DSSC architecture.

Main Methods:

• Incorporation of porphyrin-based dyes (YD2-o-C8, YDD6) and organic chromophore (TTAR).
• Fabrication of conventional DSSCs with liquid electrolytes.
• Integration of Cs2SnI6 as an encapsulating layer and solid-state electrolyte.

Main Results:

• A conventional DSSC achieved a power conversion efficiency (PCE) of 11.2% with multiple dyes.
• Cs2SnI6 encapsulation reduced charge leakage and extended absorption to longer wavelengths.
• An all-solid-state DSSC with Cs2SnI6/succinonitrile electrolyte reached a PCE of approximately 8.5%.

Conclusions:

• Simultaneous dye incorporation effectively enhances light harvesting in DSSCs.
• Cs2SnI6 serves as a beneficial encapsulating layer and component of solid-state electrolytes.
• The developed all-solid-state DSSC design shows potential for improved long-term device stability.