Molecular Acceptors Based on a Triarylborane Core Unit for Organic Solar Cells

Area of Science:

• Organic electronics
• Materials science
• Photovoltaics

Background:

• Triarylboranes with p-π* conjugation are key for n-type organic semiconductors.
• Designing efficient molecular acceptors is crucial for advancing organic solar cells (OSC).

Purpose of the Study:

• To synthesize and characterize novel molecular acceptors based on triarylborane cores.
• To investigate the impact of structural modifications on optoelectronic properties and OSC performance.

Main Methods:

• Synthesis of triarylborane derivatives with electron-withdrawing end-capping groups (IC) and bithiophene linkers.
• Incorporation of butyl or butoxy substituents on bithiophene units.
• Fabrication and testing of OSC devices using the synthesized materials.

Main Results:

• Synthesized molecules exhibit low LUMO/HOMO energy levels and broad visible absorption.
• Butyl groups enhanced solubility and blend morphology; butoxy groups improved planarity and reduced band gap.
• OSC devices achieved power conversion efficiencies up to 4.07%.

Conclusions:

• Triarylboranes are effective core units for small molecule acceptors in OSCs.
• Structural tuning via substituents significantly impacts optoelectronic properties and device performance.
• These findings highlight the potential of triarylboranes for next-generation organic solar cells.