Rationalizing Star‐Shaped Nonfullerene Acceptors in Ternary Organic Solar Cells: Morphology Mediation Facilitates Exciton and Carrier Dynamics DOI
Zhiyuan Wu, Weiyi Wang, Hui Qian

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 7, 2025

Abstract Star‐shaped trimeric acceptors have garnered increasing attention in organic solar cells (OSCs), yet a mechanistic gap exists on regulation of morphology and carrier dynamics. Herein, nonfullerene acceptor named BTF‐Trimer bearing benzotrifuran core with more electronegative oxygen atoms is newly designed, which fosters intermolecular interactions both polymer donors small‐molecule acceptors. possesses reduced aggregation tendencies high glass transition temperature, are conducive to inhibiting excessive phases stabilizing film morphology, respectively. Notably, as mediator strengthened host donor‐acceptor compatibility ternary blend active layers, forming dual‐fibril interpenetrating networks that promoted exciton dissociation hole transfer well alleviated bimolecular recombination devices. Consequently, the power conversion efficiency T 70 (the time required reach 70% initial efficiency) lifetime OSCs an Ar atmosphere achieved 19.13% ≈2800 h, This study highlights distinctive merits star‐shaped suppress over‐crystallization enhance phase continuity, offering insights into interplay phase‐separated dynamics, plays critical role

Language: Английский

Impact of Linking‐Site on Photovoltaic Performance of Giant Molecular Acceptors Containing N‐Type Linker DOI Open Access

Shixin Meng,

Yu Zang,

Zongtao Wang

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Abstract Connecting small molecule acceptors through conjugated or nonconjugated linker to form giant molecular (GMAs) represents a strategic approach enhancing the morphological stability of organic solar cells (OSCs). In this study, we employed benzothiadiazole (BT) as typical n ‐type design and synthesize two GMAs linking‐site isomerization: i‐BT‐DY o‐BT‐DY. Compared i‐BT‐DY, o‐BT‐DY exhibits enhanced crystallinity more favorable face‐on orientation but lower electron mobility. This can be well explained by theoretical calculations, demonstrates delocalized LUMO distribution significantly stronger intramolecular super‐exchange coupling (43.7 meV versus 22.2 for o‐BT‐DY). Additionally, also red‐shifted absorption. Combining these attributes, PM6: blend achieved an impressive power conversion efficiency (PCE) 18.86%. The PCE further increased 19.49% in ternary blend. As expected, OSCs based on both exhibit exceptional long‐term photostability (T85% >1000 hours). work deepens our understanding how linkers at different linking sites influence performance GMAs, concluding that interaction, rather than intermolecular, are primary factor affecting charge transport acceptors. it highlights potential components OSCs.

Language: Английский

Citations

1
Synthesis and photovoltaic properties of the efficient polymer donor based on benzo[1,2-b:4,5-b’]difuran unit DOI
Jin Luo, Lei Wang, Linglong Ye

et al.

European Polymer Journal, Journal Year: 2025, Volume and Issue: unknown, P. 113766 - 113766

Published: Jan. 1, 2025

Language: Английский

Citations

0
Dual-asymmetric backbone constructed polymerized small molecule acceptors for efficient all-polymer solar cells DOI

Wenyan Su,

Tao Sun,

Guangyu Qi

et al.

Journal of Materials Chemistry A, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Dual-asymmetric polymer acceptors with finely-tailored molecular energy levels, crystallinity, and packing are developed for the first time, achieving an efficiency of 17.28% in all-polymer solar cells.

Language: Английский

Citations

0
Rationalizing Star‐Shaped Nonfullerene Acceptors in Ternary Organic Solar Cells: Morphology Mediation Facilitates Exciton and Carrier Dynamics DOI
Zhiyuan Wu, Weiyi Wang, Hui Qian

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: May 7, 2025

Abstract Star‐shaped trimeric acceptors have garnered increasing attention in organic solar cells (OSCs), yet a mechanistic gap exists on regulation of morphology and carrier dynamics. Herein, nonfullerene acceptor named BTF‐Trimer bearing benzotrifuran core with more electronegative oxygen atoms is newly designed, which fosters intermolecular interactions both polymer donors small‐molecule acceptors. possesses reduced aggregation tendencies high glass transition temperature, are conducive to inhibiting excessive phases stabilizing film morphology, respectively. Notably, as mediator strengthened host donor‐acceptor compatibility ternary blend active layers, forming dual‐fibril interpenetrating networks that promoted exciton dissociation hole transfer well alleviated bimolecular recombination devices. Consequently, the power conversion efficiency T 70 (the time required reach 70% initial efficiency) lifetime OSCs an Ar atmosphere achieved 19.13% ≈2800 h, This study highlights distinctive merits star‐shaped suppress over‐crystallization enhance phase continuity, offering insights into interplay phase‐separated dynamics, plays critical role

Language: Английский

Citations

0