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

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 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.

Язык: Английский

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Progress in the Stability of Small Molecule Acceptor‐Based Organic Solar Cells

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 5, 2024

Abstract Significant advancements in power conversion efficiency have been achieved organic solar cells with small molecule acceptors. However, stability remains a primary challenge, impeding their widespread adoption renewable energy applications. This review summarizes the degradation of different layers within device structure under varying conditions, including light, heat, moisture, and oxygen. For photoactive layers, chemical pathways polymer donors acceptors are examined detail, alongside morphological bulk heterojunction structure, which plays crucial role performance. The mechanisms commonly used anode cathode interlayers electrodes addressed, as these significantly influence overall stability. Mitigation methods for identified provided each section to offer practical insights improving longevity. Finally, an outlook presents remaining challenges achieving long‐term stability, emphasizing research directions that require further investigation enhance reliability performance real‐world

Язык: Английский

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Asymmetrically Substituted Quinoxaline Enabling Conformation-Locked Polymer Donors toward High-Performance Polymer Solar Cells

Chemistry of Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 2, 2025

Polymer donors are a key component for high-performance polymer solar cells (PSCs), and the emergence of giant acceptors presents challenge in designing accessible that improve miscibility device performance. In this study, we developed series quinoxaline (Qx)-based polymers by introducing monosubstituted conjugated side chains employing noncovalent conformational locks to maintain backbone rigidity. This approach minimizes steric hindrance enhances molecular rigidity while simplifying synthesis, potentially reducing cost Qx-based materials. Among these polymers, F atom-substituted PF-2F demonstrated superior planarity due CH···F hydrogen bonds, thereby improving crystallinity with tethered dimeric (DY2). As result, binary PSC based on achieved PCE 17.5%, which increased 18.3% after addition additional donor D18 construct ternary PSCs. work highlights how asymmetric modulate photovoltaic properties, providing new insights rational design materials complement acceptors.

Язык: Английский

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New Polymeric Acceptors Based on Benzo[1,2‐b:4,5‐b′] Difuran Moiety for Efficient All‐Polymer Solar Cells

Macromolecular Rapid Communications, Год журнала: 2024, Номер unknown

Опубликована: Дек. 18, 2024

In order to realize high-performance bulk-heterojunction (BHJ) all-polymer solar cells, achieving appropriate aggregation and moderate miscibility of the polymer blends is one critical factor. Herein, this study designs synthesizes two new acceptors (P

Язык: Английский

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