Green-solvent-processed hybrid solar cells based on donor-acceptor conjugated polyelectrolyte

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Development of efficient and environmentally friendly solar cells is crucial for sustainable energy.
• Hybrid solar cells (HSCs) combining organic and inorganic materials offer tunable properties.
• Green-solvent processing is desirable to reduce environmental impact.

Purpose of the Study:

• To design and synthesize a novel conjugated polyelectrolyte (PFBTBr) for green-solvent-processed HSCs.
• To investigate the performance of HSCs using PFBTBr as a donor and Cadmium Telluride (CdTe) nanocrystals as an acceptor.
• To optimize the active layer and interfacial properties for enhanced photovoltaic efficiency.

Main Methods:

• Synthesis of quaternary ammonium side chain modified conjugated polyelectrolyte (PFBTBr).
• Fabrication of green-solvent-processed HSCs using PFBTBr and CdTe nanocrystals.
• Optimization of the active layer morphology for improved charge transport.
• Interfacial modification and chloride treatment for performance enhancement.

Main Results:

• PFBTBr exhibits good solubility in green solvents and a broad absorption spectrum (300-700 nm).
• Optimized active layer resulted in a photovoltaic efficiency of 3.67%.
• Interfacial modification and chloride treatment boosted the power conversion efficiency to 5.03% with 87.01% external quantum efficiency.

Conclusions:

• The designed PFBTBr is a promising donor material for green-solvent-processed HSCs.
• Optimization strategies significantly improve the performance of these hybrid solar cells.
• Achieved efficiency demonstrates the viability of eco-friendly materials in solar energy conversion.