A tetraphenylethylene core-based 3D structure small molecular acceptor enabling efficient non-fullerene organic solar...

Area of Science:

• Materials Science
• Organic Electronics
• Renewable Energy

Background:

• Organic solar cells (OSCs) offer a promising alternative to traditional silicon-based photovoltaics.
• Developing efficient small molecule acceptors is crucial for advancing non-fullerene OSC technology.
• Current small molecule acceptors often face limitations in morphology control and charge transport.

Purpose of the Study:

• To design and synthesize a novel small molecule acceptor with a unique 3D structure.
• To investigate the impact of the 3D molecular architecture on the performance of non-fullerene OSCs.
• To establish a new molecular design strategy for high-performance small molecule acceptors.

Main Methods:

• Synthesis of a tetraphenylethylene core-based small molecule acceptor.
• Fabrication of bulk-heterojunction blend films for organic solar cells.
• Characterization of film morphology and device performance, including power conversion efficiency (PCE).

Main Results:

• A novel small molecule acceptor with a 3D structure was successfully developed.
• Bulk-heterojunction blend films exhibited a small feature size of approximately 20 nm.
• The non-fullerene organic solar cells achieved a power conversion efficiency of 5.5%.

Conclusions:

• The developed 3D small molecule acceptor enables the formation of optimized blend film morphologies.
• The unique molecular design leads to efficient charge generation and transport in non-fullerene OSCs.
• This study presents a new molecular design approach for high-performance 3D-structured small molecule acceptors in organic solar cells.