Ternary Strategy and Molecular Electrostatics Collaboratively Optimize Low-Molecular-Weight Polymer Donor Organic Solar Cells Over 20% Efficiency and High Scalability

Ternary Strategy and Molecular Electrostatics Collaboratively Optimize Low-Molecular-Weight Polymer Donor Organic Solar Cells : Over 20% Efficiency and High Scalability

© 2025 Wiley‐VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - (2025) vom: 16. Aug., Seite e10980
1. Verfasser: Yang, Yaxin (VerfasserIn)
Weitere Verfasser: Wei, Lu, Zhan, Lingling, Liu, Yuhao, Lu, Hongyang, Wu, Xiaoling, Wupur, Adiljan, Chen, Tianyi, Yu, Jinyang, Sun, Xiaokang, Hu, Hanlin, Sun, Rui, Min, Jie, Luo, Yongmin, Wu, Jiaying, Fu, Weifei, Yin, Shouchun, Chen, Hongzheng
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2025
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article high scalability interpenetrating network morphology low‐molecular‐weight polymer molecular electrostatics ternary strategy
Beschreibung
Zusammenfassung:© 2025 Wiley‐VCH GmbH.
Achieving consistent performance across polymer donor batches is crucial for the commercialization of organic solar cells (OSCs). Compared with high-molecular-weight PM6 (HWPM6), low-molecular-weight PM6 (LWPM6) has lower efficiency but better stress-dispersion characteristics and solution-processability, making its performance improvement vital for practical applications. Here, LWPM6-based OSCs are optimized by introducing a trimeric guest (TYT-S). TYT-S improves PM6:Y6 compatibility, achieving a finer phase separation and a favorable interpenetrating network morphology. A ternary strategy, leveraging molecular electrostatic potential differences, promotes LWPM6 pre-aggregation, extends film-formation time, and enhances molecular ordering. The LWPM6-based ternary system exhibits an optimized vertical phase distribution, with maximum exciton dissociation occurring near the cathode, resulting in a power conversion efficiency (PCE) of 19.23% (LWPM6-based binary with a low PCE of 17.35%). When BTP-eC9 replaces Y6, the LWPM6-based ternary devices achieve a PCE of 20.12% (LWPM6-based binary with a low PCE of 17.64%). Additionally, LW polymers can dissipate stress via segmental motion. After 3000 bending cycles, LWPM6-based flexible devices retain higher initial efficiency than HWPM6-based one, demonstrating better mechanical stability. In mini-modules, they also have good solution-processability. This work demonstrates that a trimer guest strategy can significantly enhance the photovoltaic performance of low-efficiency LWPM6, offering new insights for OSCs commercialization
Beschreibung:Date Revised 16.08.2025
published: Print-Electronic
Citation Status Publisher
ISSN:1521-4095
DOI:10.1002/adma.202510980