Recent Progress in All-Polymer Solar Cells Based on Wide-Bandgap p-Type Polymers

Area of Science:

• Materials Science
• Organic Electronics
• Renewable Energy

Background:

• All-polymer solar cells (all-PSCs) utilize only polymers for both donor and acceptor materials in the photoactive layer.
• These devices offer advantages in optical, thermal, and mechanical durability compared to traditional solar cells.
• Recent progress has significantly improved the power conversion efficiencies (PCEs) of single-junction all-PSCs.

Purpose of the Study:

• To review recent advancements in all-polymer solar cells (all-PSCs).
• To focus on wide band-gap p-type polymer donors and their corresponding n-type polymer acceptors.
• To outline strategies for molecular design and morphology optimization to enhance PCEs.

Main Methods:

• Review of literature on all-polymer solar cells.
• Analysis of p-type polymer donors based on specific chemical units (e.g., thieno[3,4-c]pyrrole-4,6(5H)-dione], fluorinated benzotriazole, benzo[1,2-c:4,5-c']dithiophene-4,8-dione, pyrrolo[3,4-f]benzotriazole-5,7(6H)-dione).
• Examination of various n-type polymer acceptors used in conjunction with these donors.

Main Results:

• Power conversion efficiencies of single-junction all-PSCs have reached up to 11%.
• Identified key polymer donor units contributing to high performance.
• Highlighted the importance of matching polymer donors and acceptors for optimal device function.

Conclusions:

• All-polymer solar cells demonstrate significant potential due to their inherent durability.
• Strategic molecular design and morphology control are crucial for further efficiency improvements.
• Continued research in polymer chemistry and device engineering promises higher performance all-PSCs.