Highly Polarizable Embedded Interfaces Toward Superior Organic Heterojunction Photocatalysts

Area of Science:

• Materials Science
• Photocatalysis
• Organic Electronics

Background:

• Organic photovoltaic catalysts (OPCs) are promising for energy and environmental applications.
• Disordered donor/acceptor interfaces in OPCs limit exciton dissociation and charge recombination, hindering photocatalytic performance.

Purpose of the Study:

• To enhance the photocatalytic performance of OPCs by addressing interface limitations.
• To investigate the effect of an embedded interface strategy using a polarizable molecule (Y6CO-S) on OPCs.

Main Methods:

• Fabrication of bulk heterojunction (BHJ) OPCs with an embedded Y6CO-S molecule at the donor/acceptor interface.
• Characterization of photocatalytic hydrogen evolution rates and external quantum efficiencies.
• Optimization of nanoparticle (NP) concentrations for performance.

Main Results:

• The optimized PM6:PYF-T-o:Y6CO-S NPs demonstrated significantly enhanced hydrogen evolution rates.
• External quantum efficiencies exceeded 10% across the visible to near-infrared spectrum.
• Performance improvements of 36%-47% were observed compared to systems without the embedded interface.

Conclusions:

• The embedded interface strategy effectively amplifies local electric fields and improves molecular ordering in OPCs.
• This strategy enhances hole transfer efficiency and hole polaron lifetime, boosting photocatalytic activity.
• The findings highlight the potential of embedded interfaces for high-performance OPCs and optoelectronic devices.