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Aggregation-Induced Doping Enhancement Enabled by Non-Covalent Conformation Locking on Conjugated Polyelectrolyte
1State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, People's Republic of China.
Angewandte Chemie (International Ed. in English)
|June 7, 2026
Summary
Researchers developed conjugated polyelectrolytes (CPEs) that enhance doping through molecular aggregation. This improves conductivity and performance in organic solar cells (OSCs), offering a new approach for high-efficiency anode interlayers (AILs).
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Anode interlayers (AILs) are crucial for organic solar cell (OSC) performance, but current materials often have low doping density and poor conductivity.
- Developing non-corrosive AILs compatible with large-area fabrication remains a significant challenge in OSC research.
Purpose of the Study:
- To investigate aggregation-induced doping enhancement in conjugated polyelectrolytes (CPEs) for improved AIL performance in OSCs.
- To design CPEs with conformational locks (S-O and S-F interactions) promoting coplanar backbones and ordered aggregation.
Main Methods:
- Synthesis of novel CPEs with specific non-covalent interactions.
- Characterization of film morphology, molecular aggregation (π-π stacking), and conductivity.
- Fabrication and testing of OSC devices utilizing the developed CPE-based AILs.
Main Results:
- Ordered aggregation of CPE films induced significant p-doping and enhanced charge transport.
- PEP-2SF exhibited a π-π stacking distance of 3.53 Å and conductivity of 4.34 × 10-2 S/m after polyoxometalate (POM) doping.
- OSCs with PEP-2SF AIL achieved a power conversion efficiency (PCE) of 20.28%.
- A 1.2-cm2 blade-coated device demonstrated a PCE of 17.31%, showing thickness insensitivity and large-area processing compatibility.
Conclusions:
- Aggregation-induced doping enhancement in CPEs is an effective strategy for developing high-performance AILs.
- The designed CPEs offer high conductivity and compatibility with scalable fabrication methods for OSCs.
- This work provides a promising pathway for advancing OSC technology through improved anode interlayers.
