Recent progress in Y-series small molecule acceptors in polymer solar cells

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Background:

• Polymer solar cells (PSCs) are a promising next-generation photovoltaic technology due to their flexibility and low-cost fabrication.
• Y-series small molecule acceptors (SMAs) have shown significant potential in improving PSC performance.

Purpose of the Study:

• To systematically review recent advancements in Y-series SMAs for PSCs.
• To analyze how molecular structure modifications influence optoelectronic properties and device performance.

Main Methods:

• Categorization of Y-series SMAs based on electron-deficient fused-ring central cores: benzotriazole (BTA), benzothiadiazole (BT), and quinoxaline (Qx).
• Analysis of molecular structure optimization strategies: central core, side-chain, and end-group engineering.
• Correlation of structural changes with optoelectronic properties, film morphology, and device performance.

Main Results:

• Y-series SMAs with optimized molecular structures demonstrate enhanced photovoltaic performance.
• Specific examples of BTA, BT, and Qx based SMAs show improved efficiency.
• Structure-property relationships are elucidated, guiding future material design.

Conclusions:

• Molecular engineering of Y-series SMAs is crucial for advancing PSC technology.
• Further development of high-efficiency PSCs can be achieved through strategic material design and optimization.
• This review provides insights for constructing next-generation, high-performance polymer solar cells.