Dimerized Acceptors with Conjugate‐Break Linker Enable Highly Efficient and Mechanically Robust Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(22)

Опубликована: Март 26, 2024

Abstract Designing new acceptors is critical for intrinsically stretchable organic solar cells (IS‐OSCs) with high efficiency and mechanical robustness. However, nearly all polymer exhibit limited high‐performance small molecular are very brittle. In this regard, we select thienylene‐alkane‐thienylene (TAT) as the conjugate‐break linker synthesize four dimerized by regulation of connecting sites halogen substitutions. It found that substitutions considerably impact overall electronic structures, aggregation behaviors, charge transport properties. Benefiting from optimization structure, acceptor exhibits rational phase separation within blend films, which significantly facilitates exciton dissociation while effectively suppressing recombination processes. Consequently, FDY‐m‐TAT‐based rigid OSCs render highest power conversion (PCE) 18.07 % among reported containing linker. Most importantly, IS‐OSCs achieve PCE (14.29 %) remarkable stretchability (crack‐onset strain [COS]=18.23 %), surpassing Y6‐based counterpart (PCE=12.80 COS=8.50 %). To sum up, these findings demonstrate linkers have immense potential in developing highly efficient mechanically robust OSCs.

Язык: Английский

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Synergistic Regulation of Crystallization Kinetics of Donor/Acceptor by New Volatile Additives for High Performance Organic Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер 34(37)

Опубликована: Март 21, 2024

Abstract Ideal nanoscale morphology of heterojunction active layer is important for the development organic solar cells (OSCs). However, mismatched crystalline kinetic between polymer donor and small molecular acceptor often leads to difficulties in controlling layer. Herein, polar 1,2‐dibromo‐4,5‐difluorobenzene (DFB) non‐polar 1,4‐dibromotetrafluorobenzene (TFB) are developed as volatile additives OSCs. More attractively, different from reported additives, both new can simultaneously interact with acceptor, synergistic regulating crystallization well‐balancing behaviors during film formation process. Notably, due stronger dipole‐dipole interactions layer, DFB induces more favorable than TFB. As a result, two additives‐treated PM6:Y6 devices outperform CN‐treated device (16.13%), DFB‐treated deliver higher efficiency 17.15% TFB‐treated one (16.30%). With additive, PM6:L8‐BO PM6: BTP‐eC9 also achieve superior 18.46% 18.17%, respectively. This work deepens insights kinetics optimizing by developing simple further achieving high‐efficient

Язык: Английский

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2,5-dichloro-3,4-diiodothiophene as a versatile solid additive for high-performance organic solar cells

Nano Energy, Год журнала: 2024, Номер 125, С. 109604 - 109604

Опубликована: Апрель 10, 2024

Язык: Английский

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Multi‐Selenophene Strategy Enables Dimeric Acceptors‐Based Organic Solar Cells with over 18.5% Efficiency

Advanced Energy Materials, Год журнала: 2024, Номер 14(30)

Опубликована: Май 9, 2024

Abstract Dimeric acceptor (DMA) becomes a promising alternative to small‐molecular and polymeric acceptor‐based organic solar cells (OSCs) due its well‐defined chemical structure, high batch‐to‐batch reproducibility, low molecular diffusion properties. However, DMAs usually exhibit blueshifted absorptions, limiting their photon utilization abilities. Herein, multi‐selenophene strategies are adopted develop redshifted DMAs. From monomer (YSe) dimers (DYSe‐1 DYSe‐2), reduced electron reorganization energies exciton binding enable the efficient charge dynamics in DMAs‐based OSCs. Together with effective absorption extending ≈920 nm, DYSe‐1‐ DYSe‐2‐ based OSCs outstanding short‐circuit current densities ( J SC s) over 27 mA cm −2 , which best among Besides, compared YSe‐based device, both DMA‐based devices have higher electroluminescence quantum efficiencies thus reduce nonradiative recombination loss (ΔE 3 ), contributing energy losses. The resultant open‐circuit voltages V OC of ≈0.88 V, which, combining super values, lead power conversion 18.56% 18.22%, respectively. These results highlight great potential strategy for development performance.

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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Synergistic strategy of rigid-bridge and flexible-bridge achieving high-performance and mechanical robustness all-Polymer solar cells

Chemical Engineering Journal, Год журнала: 2024, Номер 491, С. 152009 - 152009

Опубликована: Май 8, 2024

Язык: Английский

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Compatibilizer Effects of Strategically Designed Donor–Acceptor Block Copolymers to Enhance the Performance, Stability, and Mechanical Durability of Inverted Organic Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Авг. 7, 2024

Abstract A strategically designed donor–acceptor (D‐A) block copolymer (PM6‐ b ‐PYIT) is introduced, as a compatibilizer to enhance the performance and stability of inverted organic solar cells (OSCs) consisting bulk heterojunction (BHJ) PM6 L8‐BO. The PM6‐ ‐PYIT not only significantly boosts power conversion efficiency from 16.32% 18.02%, but also further modulates molecular arrangement improves compatibility between donor acceptor materials. This stems structural similarity host materials, which facilitates ordered stacking superior charge‐transporting properties, thereby improving dielectric constant built‐in voltage mitigating excessive charge recombination. More importantly, role in stabilizing BHJ morphology under long‐term aging conditions highlighted, ascribed improved miscibility different components composite. turn renders photoactive layer more mechanically durable, making it suitable for stretchable applications.

Язык: Английский

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Dimerized small-molecule acceptors with electron withdrawing linker for efficient organic solar cells

Chemical Engineering Journal, Год журнала: 2025, Номер unknown, С. 160416 - 160416

Опубликована: Фев. 1, 2025

Язык: Английский

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High‐Performance Intrinsically‐Stretchable Organic Solar Cells Enabled by Electron Acceptors with Flexible Linkers

Angewandte Chemie International Edition, Год журнала: 2025, Номер unknown

Опубликована: Фев. 27, 2025

Abstract Intrinsically stretchable organic solar cells (IS‐OSCs) are emerging as promising candidates for powering next‐generation wearable electronics. However, developing molecular design strategies to achieve both high efficiency and mechanical robustness in IS‐OSCs remains a significant challenge. In this work, we present novel approach by synthesizing dimerized electron acceptor (DY‐FBrL) that enables rigid OSCs with power conversion (PCE) of 18.75 % crack‐onset strain (COS) 18.54 %. The enhanced PCE stretchability DY‐FBrL‐based devices attributed its extended π‐conjugated backbone elongated side chains. Furthermore, introduce an innovative polymerized (PDY‐FL), synthesized via the polymerization DY‐FBrL. While PDY‐FL‐based exhibit slightly lower 14.13 %, they significantly higher COS 23.45 representing one highest PCEs reported acceptors containing only flexible linkers. Consequently, fabricated using DY‐FBrL PDY‐FL notable 14.31 11.61 respectively. Additionally, device improves progressively from Y6 (strain at 80% =11 %), =23 =31 %). This study presents strategy tailoring structures, offering new pathway develop high‐performance properties.

Язык: Английский

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Molecular Design of Dimeric Acceptor Enables Binary Organic Solar Cells with 19.78% Efficiency and Enhanced Stability

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 3, 2025

Abstract The development of organic solar cells (OSCs) with high efficiency and stability is highly desirable to facilitate its commercial applications. Although dimeric acceptors distinctive advantages have been widely studied, high‐performance binary OSCs based on such molecules rarely achieved. In this work, a new acceptor (DY‐FL) constructed by simultaneously optimizing the linking sites units, as well building blocks. Thanks effective molecular design, DY‐FL provides improved stacking for fibrous morphology favorable exciton/charge dynamics. Consequently, DY‐FL‐based render superior power conversion (PCE) 19.78%, representing record‐breaking acceptors. Importantly, devices display significantly enhanced operational under external stimuli light heat, in comparison their small molecule (Y‐F)‐based counterpart. These findings highlight significance blocks modes, providing insight into design strategy state‐of‐the‐art OSCs.

Язык: Английский

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