Over 18% Efficiency Ternary Organic Solar Cells with 300 nm Thick Active Layer Enabled by an Oligomeric Acceptor

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(2)

Published: Sept. 18, 2023

The development of high-efficiency thickness-insensitive organic solar cells (OSCs) is crucially important for the mass production panels. However, increasing active layer thickness usually induces a substantial loss in efficiency. Herein, ternary strategy which an oligomer DY-TF incorporated into PM6:L8-BO system as guest component adopted to break this dilemma. S···F intramolecular noncovalent interactions backbone endow with high planarity. Upon addition DY-TF, crystallinity blend effectively improved, leading increased charge carrier mobility, highly desirable fabrication thick-film devices. As result, thin-film PM6:L8-BO:DY-TF-based device (110 nm) shows power conversion efficiency (PCE) 19.13%. Impressively, when increases 300 nm, 18.23% (certified 17.8%) achieved, representing highest reported nm thick OSCs thus far. Additionally, blade-coated (300 delivers promising PCE 17.38%. This work brings new insights construction efficient tolerance, showing great potential roll-to-roll printing large-area cells.

Language: Английский

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Strengthening the Hetero‐Molecular Interactions in Giant Dimeric Acceptors Enables Efficient Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)

Published: Nov. 23, 2023

Abstract Giant dimeric acceptor (G‐Dimer) is becoming one of the most promising organic solar cell (OSC) materials because its definite structure, long‐term stability, and high efficiency. Strengthening hetero‐molecular interactions by monomer modification greatly influences morphology thus device performance, but lacks investigation. Herein, two novel quinoxaline core‐based G‐Dimers, Dimer‐QX Dimer‐2CF, are synthesized. By comparing trifluoromethyl‐substituted Dimer‐2CF non‐substituted Dimer‐QX, trifluoromethylation effect on G‐Dimer investigated revealed. The trifluoromethyl with strong electronegativity increases electrostatic potential reduces surface energy G‐Dimer, weakening homo‐molecular ordered packing reinforcing interaction donor. suppresses fast assembly during film formation, facilitating small domains molecular in blend, which a trade‐off conventional control. Together favorable vertical phase separation, efficient charge generation, reduced bimolecular recombination concurrently obtained. Hence, Dimer‐2CF‐based OSCs obtain cutting‐edge efficiency 19.02% fill factor surpassing 80%, an averaged extrapolated T 80 ≈12 000 h under continuous °C heating. This study emphasizes importance strategy, providing facile strategy for designing highly stable OSC materials.

Language: Английский

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Non‐Fully Conjugated Dimerized Giant Acceptors with Different Alkyl‐Linked Sites for Stable and 19.13 % Efficiency Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(14)

Published: Feb. 9, 2024

Abstract Achieving both high power conversion efficiency (PCE) and device stability is a major challenge for the practical development of organic solar cells (OSCs). Herein, three non‐fully conjugated dimerized giant acceptors (named 2Y‐sites, including wing‐site‐linked 2Y‐wing, core‐site‐linked 2Y‐core, end‐site‐linked 2Y‐end) are developed. They share similar monomer precursors but have different alkyl‐linked sites, offering fine‐tuned molecular absorption, packing, glass transition temperature, carrier mobility. Among their binary active layers, D18/2Y‐wing has better miscibility, leading to optimized morphology more efficient charge transfer compared D18/2Y‐core D18/2Y‐end. Therefore, D18/2Y‐wing‐based OSCs achieve superior PCE 17.73 %, attributed enhanced photocurrent fill factor. Furthermore, exhibit balance improved stability, distinguishing them within 2Y‐sites. Building on success 2Y‐wing in systems, we extend its application ternary by pairing it with near‐infrared absorbing D18/BS3TSe‐4F host. Thanks complementary absorption 300–970 nm further morphology, obtain higher 19.13 setting new benchmark dimer‐derived OSCs. This approach site engineering constructing presents promising pathway improve

Language: Английский

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Low-Cost Nonfused-Ring Electron Acceptors Enabled by Noncovalent Conformational Locks

Accounts of Chemical Research, Journal Year: 2024, Volume and Issue: 57(6), P. 981 - 991

Published: March 3, 2024

ConspectusSince the first bilayer-structured organic solar cells (OSCs) in 1986, fullerenes and their derivatives have dominated landscape for two decades due to unique properties. In recent years, breakthrough nonfullerene acceptors (NFAs) was mainly attributed development of fused-ring electron (FREAs), whose photovoltaic performance surpassed that fullerene derivatives. Through unremitting efforts whole community, power conversion efficiencies (PCEs) 19% FREA-based OSCs. However, FREAs generally suffered from complex synthetic approaches high product costs, which hindered large-scale production. Therefore, many researchers are seeking a new type NFA achieve cost-effective, highly efficient OSCs.In collaboration with Marks Facchetti 2012, Huang et al. (Huang, H. J. Am. Chem. Soc. 134, 10966−10973, 10.1021/ja303401s) proposed concept "noncovalent conformational locks" (NoCLs). following our group has been focusing on theoretical experimental exploration NoCLs, revealing fundamental nature, formulating simple descriptor quantifying strength, employing this approach high-performance organic/polymeric semiconductors optoelectronics, such as OSCs, thin-film transistors, room-temperature phosphorescence, photodetectors. The NoCLs strategy proven be effective enhancing molecular rigidity planarity, thus improving charge transport mobilities semiconductors, reduced reorganization energy suppressed nonradiative decay.In 2018, Chen (Li, S. Adv. Mater. 30, 1705208, 10.1002/adma.201705208) reported example nonfused-ring (NFREAs) intramolecular noncovalent F···H interactions. is essential NFREAs, it simplifies conjugated structures while maintaining coplanarity comparable FREAs. Due concise synthesis routes, NFREAs show great potential achieving cost-effective Account, we provide an overview developing strategy. We begin discussion distinct features compared FREAs, structural simplification completely NFREAs. Next, examine several selected typical examples remarkable performance, aiming in-depth design principle structure–property–performance relationships. Then, discuss how balance among efficiency, stability, cost through two-in-one polymerized (PNFREAs). Finally, offer views current challenges future prospects hope Account will trigger intensive research interest field, propelling OSCs into stage.

Language: Английский

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Simple‐Structured Acceptor with Highly Interconnected Electron‐Transport Pathway Enables High‐Efficiency Organic Solar Cells

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(23)

Published: Feb. 19, 2024

Abstract Achieving desirable charge‐transport highway is of vital importance for high‐performance organic solar cells (OSCs). Here, it shown how molecular packing arrangements can be regulated via tuning the alkyl‐chain topology, thus resulting in a 3D network stacking and highly interconnected pathway electron transport simple‐structured nonfused‐ring acceptor (NFREA) with branched alkyl side‐chains. As result, record‐breaking power conversion efficiency 17.38% (certificated 16.59%) achieved NFREA‐based devices, providing an opportunity constructing low‐cost high‐efficiency OSCs.

Language: Английский

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Advances in Stretchable Organic Photovoltaics: Flexible Transparent Electrodes and Deformable Active Layer Design

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(37)

Published: May 30, 2024

Stretchable organic photovoltaics (OPVs) have attracted significant attention as promising power sources for wearable electronic systems owing to their superior robustness under repetitive tensile strains and good compatibility. However, reconciling a high power-conversion efficiency reasonable flexibility is tremendous challenge. In addition, the development of stretchable OPVs must be accelerated satisfy increasing requirements niche markets mechanical robustness. OPV devices can classified either structurally or intrinsically stretchable. This work reviews recent advances in OPVs, including design mechanically robust transparent electrodes, photovoltaic materials, devices. Initially, an overview characteristics research progress areas provided. Subsequently, into flexible electrodes that directly affect performances summarized analyzed. Overall, this review aims provide in-depth understanding intrinsic properties highly efficient deformable active while also emphasizing advanced strategies simultaneously improving performance layer, material design, multi-component settings, structural optimization.

Language: Английский

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Precisely Manipulating Molecular Packing via Tuning Alkyl Side‐Chain Topology Enabling High‐Performance Nonfused‐Ring Electron Acceptors

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(10)

Published: Jan. 8, 2024

In the development of high-performance organic solar cells (OSCs), self-organization semiconductors plays a crucial role. This study focuses on precisely manipulation molecular assemble via tuning alkyl side-chain topology in series low-cost nonfused-ring electron acceptors (NFREAs). Among three NFREAs investigated, DPA-4, which possesses an asymmetric length, exhibits tight packing crystal and high crystallinity film, contributing to improved mobility favorable film morphology for DPA-4. As result, OSC device based DPA-4 achieves excellent power conversion efficiency 16.67 %, ranking among highest efficiencies NFREA-based OSCs.

Language: Английский

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Tethered Trimeric Small‐molecular Acceptors through Aromatic‐core Engineering for Highly Efficient and Thermally Stable Polymer Solar Cells

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(15)

Published: Feb. 7, 2024

Polymer solar cells (PSCs) rely on a blend of small molecular acceptors (SMAs) with polymer donors, where thermodynamic relaxation SMAs poses critical concerns operational stability. To tackle this issue, tethered SMAs, wherein multiple SMA-subunits are connected to the aromatic-core via flexible chains, proposed. This design aims an elevated glass transition temperature (T

Language: Английский

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Simultaneous enhancement of efficiency, stability and stretchability in binary polymer solar cells with a three-dimensional aromatic-core tethered tetrameric acceptor

National Science Review, Journal Year: 2025, Volume and Issue: 12(3)

Published: Jan. 21, 2025

Polymer solar cells (PSCs) leverage blend films from polymer donors and small-molecule acceptors (SMAs), offering promising opportunities for flexible power sources. However, the inherent rigidity crystalline nature of SMAs often embrittle donor in constructed bulk heterojunction structure. To address this challenge, we improved stretchability by designing synthesizing a tethered giant tetrameric acceptor (GTA) with increased molecular weight that promotes entanglement individual SMA units. The key to design is using tetraphenylmethane as linking core create three-dimensional high C2 symmetry structure, which successfully regulates their aggregation relaxation behavior. With GTA acceptor, its PM6 exhibit significantly stretchability, nearly 150% increase crack onset strain value compared PM6:Y6. Moreover, PSCs achieve an efficiency up 18.71% demonstrate outstanding photostability, maintaining >90% initial conversion after operating over 1000 hours. Our findings specifically aligning weights more closely those counterparts, can enhanced without compromising morphological stability or device efficiency.

Language: Английский

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Coplanar Dimeric Acceptors with Bathochromic Absorption and Torsion‐Free Backbones through Precise Fluorination Enabling Efficient Organic Photovoltaics with 18.63% Efficiency

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

Abstract Giant dimeric acceptors (GDAs), a sub‐type of acceptor materials for organic solar cells (OSCs), have garnered much attention due to the synergistic advantages their monomeric and polymeric acceptors, forming well‐defined molecular structure with giant weight high efficiency stability. In this study, first time, two new GDAs, DYF‐V DY2F‐V are designed synthesized OSC operation, by connecting one vinylene linker mono‐/di‐fluorinated end group on Y‐series monomers, respectively. After fluorination, both exhibit bathochromic absorption denser packing modes stronger intramolecular charge transfer effect torsion‐free backbones. Through precise DYF‐V‐based devices highest performance 18.63% among GDA‐based OSCs, outperforming its non‐fluorinated counterpart, DY‐V‐based ones (16.53%). Theoretical morphological results demonstrate that proper fluorination in strengthens intra/intermolecular interactions enhanced crystallinity, superior phase segregation, less energy disorder, which is beneficial fast exciton dissociation, rapid carrier transport, suppressed recombination. The work demonstrates GDAs rigid coplanar backbones effective broader photon harvesting, packing, robust stability OSCs.

Language: Английский

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