Dimeric Small Molecule Acceptors via Terminal‐End Connections: Effect of Flexible Linker Length on Photovoltaic Performance

Macromolecular Rapid Communications, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 3, 2024

Abstract The dimerization of small molecule acceptors (SMAs) holds significant potential by combining the advantages both SMAs and polymer in realizing high power conversion efficiency (PCE) operational stability organic solar cells (OSCs). However, advancements selection innovation dimeric linkers are still challenging enhancing their performance. In this study, three new acceptors, namely DY‐Ar‐4, DY‐Ar‐5, DY‐Ar‐6 synthesized, linking two Y‐series SMA subunits via an “end‐to‐end” strategy using flexible spacers (octyl, decyl, dodecyl, respectively). influence spacer lengths on device performance is systematically investigated. results indicate that DY‐Ar‐5 exhibits more compact ordered packing, leading to optimal morphology. OSCs based PM6: achieves a maximum PCE 15.76%, attributes enhance balance carrier mobility, reduce recombination. This suitable non‐conjugated units provides rational principle for designing high‐performance non‐fullerene acceptors.

Language: Английский

Piperazine‐Functionalized Arylene Diimides as Electron Transport Layers for High‐Efficiency and Stable Organic Solar Cells

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 6, 2024

Abstract In organic solar cells (OSCs), electron transport layer (ETL) materials are typically designed with highly polar groups to lower the work function (WF) of cathode and ensure solvent orthogonality. However, increased surface energy associated these results in significant hygroscopicity poor interfacial contact active layer, posing a challenge for interlayer engineering that must balance device efficiency stability. Herein, two novel arylene diimides (PDI‐P NDI‐P) developed side chains end‐capped piperazine groups, as opposed commonly used amine groups. As ETLs, not only exhibit excellent conductivity but also effectively WF silver cathode. Compared amine‐functionalized perylene diimide (PDI‐N), piperazine‐functionalized (PDI‐P) exhibits reduced hygroscopicity, resulting improved wettability decreased moisture sensitivity. These characteristics contribute enhanced The PDI‐P ETL is compatible various high‐performance acceptor materials, achieving high efficiencies across wide thickness range ≈7 30 nm, maximum 19.8%. findings highlight great potential an high‐efficiency stable OSCs.

Language: Английский

Dimeric Acceptors Using Different Central Linkers to Manipulate Electronic and Morphological Properties

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 1, 2024

Abstract Dimerized acceptors show promise in combining the high performance of small‐molecule non‐fullerene (NFAs) with excellent stability polymer acceptors. The central linking units that connect two acceptor molecules together have a profound impact on dimeric properties and structure‐performance relationships blended thin films. It is seen different linkers significantly affect electronic morphology film. electron‐donating linker elevates absorption coefficient, affords lower bandgap, reduces energy loss, thus better photovoltaic device performance. Better fibrillar can be obtained. best material DY‐EDOT‐based shows power conversion efficiency (PCE) 18.21%, an open‐circuit voltage ( V oc ) 0.924 V, short‐circuit current density J sc 25.20 mA cm −2 , fill factor (FF) 78.19%, which among highest value for dimerized This study reveals fundamental importance determining provides useful strategies developing oligomeric polymeric acceptors, critical simultaneously improving organic solar cells (OSCs).

Language: Английский