Manipulating Aggregation Kinetics toward Efficient All‐Printed Organic Solar Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 5, 2025

Abstract The power conversion efficiencies (PCEs) of all‐printed organic solar cells (OSCs) remain inferior to those spin‐coated devices, primarily due morphological variations within the bulk heterojunction processed via diverse coating/printing techniques. Herein, cyclohexyl is introduced as outer side chains formulate a non‐fullerene acceptor, BTP‐Cy, aimed at modulating molecular aggregation in solution and subsequent film formation kinetics during printing. Investigations demonstrate that BTP‐Cy molecule with exhibits enhanced intermolecular π‐π stacking, optimal size, favorable phase separation. Consequently, PB3:FTCC‐Br:BTP‐Cy‐based OSCs achieve remarkable PCEs 20.2% 19.5% spin‐coating blade‐coating, respectively. Furthermore, 23.6 cm 2 module efficiency 16.7%. This study offers fresh perspective on tailoring photoactive materials printing through design, paving novel path enhance OSCs.

Язык: Английский

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Preparation of Dual-Asymmetric Acceptors via Selenium Substitution Combined with Terminal Group Optimization Strategy for High Efficiency Organic Solar Cells

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Фев. 25, 2025

Improving both the open-circuit voltage (VOC) and short-circuit current density (JSC) through development of photovoltaic materials to achieve high power conversion efficiency (PCE) is critical a significant challenge for organic solar cells (OSCs). Here, we designed novel dual-asymmetric acceptors A-SSe-TCF A-SSe-LSF by simultaneously asymmetrically regulating backbone terminal groups investigated their synergistic effects on performance in comparison with monoasymmetric acceptor A-SSe-4F. The exhibit broader spectral absorption larger half-molecule dipole moment differences, which favored enhancement JSC reduction energy loss (Eloss). Among binary blends, PM6:A-SSe-TCF exhibits superior phase separation, vertical distribution morphology, more ordered π-π stacking compared PM6:A-SSe-LSF PM6:A-SSe-4F. As result, OSCs based achieved higher PCE 18.53% VOC due suppressed nonradiative recombination enhanced charge extraction capabilities. Furthermore, incorporating as third component, PM6:L8-BO:A-SSe-TCF-based device achieves champion 19.73% without account decrement Eloss. strategy provides new insights into molecular design improvement OSCs.

Язык: Английский

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Indacenodithiophene‐Based Medium‐Bandgap Guest Acceptor Enables High‐Efficiency Ternary Organic Solar Cells

Macromolecular Rapid Communications, Год журнала: 2025, Номер unknown

Опубликована: Фев. 14, 2025

The ternary organic solar cells (OSCs) have been proven to be an effective strategy for achieving high power conversion efficiency (PCE), exhibiting substantial potential continuous enhancement of device performance. In this work, a novel nonfullerene acceptor, IDT-FN, is developed utilizing renowned indacenodithiophene (IDT) core and moderately intense electron-withdrawing terminal groups, serving as the third component in OSCs. IDT-FN demonstrates excellent complementary light absorption cascaded energy levels with host materials D18 CH-6F, resulting enhanced photon harvesting charge transport within blend. Therefore, even as-cast manages surpass optimal binary device, superior PCE 17.34% compared latter's 17.08%. Through optimization, devices attain impressive 18.32%, accompanied by open-circuit voltage (Voc) 0.897 V, fill factor 0.745, short-circuit current density (Jsc) 27.41 mA cm-2. This significant success IDT-based medium-bandgap guests achieve state-of-the-art

Язык: Английский

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Non-adiabatic Dynamical Simulations to the Radiative and Non-radiative Recombinations of the Non-fullerene Acceptor Excited State To Optimize Its Photoluminescence Quantum Yield

The Journal of Physical Chemistry Letters, Год журнала: 2025, Номер unknown, С. 3359 - 3365

Опубликована: Март 25, 2025

Optimizing the photoluminescence quantum yield (PLQY) of non-fullerene acceptor (NFA) molecules is critical for reducing non-radiative recombination energy loss in NFA-based organic solar cells. In this letter, by developing a non-adiabatic dynamical method combined with different electron population rate equations, we separately simulate radiative and process NFA molecular excited state, thus clarify quantitative correlations typical characteristics their PLQY, including analyses corresponding mechanisms directed against conventional "energy gap law". The main findings include: weakening intramolecular electron-phonon coupling electronic push-pull potential can optimize competition between recombinations, improving PLQY; furthermore, increasing intermolecular J-aggregation ratio should be an effective strategy to alleviate aggregation-induced reduction PLQY. These provide clear directions rational design morphology optimization toward higher

Язык: Английский

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A Low‐Cost 3D Spirobifluorene‐Based Acceptor for High‐Performance Ternary Organic Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 2, 2024

Abstract The advantages of 3D materials as guest components ternary organic solar cells (TOSCs) are being realized, showing great potential in improving device performance. However, the correlation between their distinctive structure and performance remains largely unexplored. Herein, a acceptor named SF‐HR is cost‐effectively synthesized utilizing twisted spirofluorene core. shows an edge‐on oriented packing but not disordered aggregation other molecules. When introduced into D18:Y6 binary system, can induce more predominant face‐on finer domain size blend, which facilitates exciton dissociation multi‐direction charge transport. Besides, exhibits complementary absorption cascaded energy levels with D18 Y6, contributing to improvement short‐circuit current density ( J sc ) open‐circuit voltage V oc ), respectively. Accordingly, optimized achieves higher 0.893 V, 27.13 mA cm −2 , fill factor (FF) 77.8%, respectively, than that host device, yielding excellent efficiency 18.85%. This success demonstrates utilization crystalline material component represents promising strategy for achieving state‐of‐the‐art OSCs, conducive understanding relationship from new perspective.

Язык: Английский

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Reducing Non‐Radiative Energy Losses in Non‐fullerene Organic Solar Cells

ChemSusChem, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 1, 2024

Abstract With the rapid advancement of non‐fullerene acceptors (NFAs), power conversion efficiency (PCE) organic solar cells (OSCs) has surpassed 20 % threshold, highlighting their considerable potential as next‐generation energy devices. In comparison to inorganic or perovskite cells, open‐circuit voltage ( V oc ) OSCs is constrained by substantial non‐radiative losses (Δ E nr ), leading values notably below those anticipated Shockley‐Queisser limit. OSCs, are intimately associated with electroluminescent quantum (EQE EL charge transfer states, which in turn directly affected photoluminescence yield (PLQY) acceptor materials. Consequently, enhancing PLQY low‐bandgap materials emerged a pivotal strategy effectively mitigate Δ . This review article delves into intrinsic correlation between molecular structure and from vantage point material design. It further explores methodologies for designing exhibiting high PLQY, ultimate goal realizing that combine minimal

Язык: Английский

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Hybrid nonfullerene acceptors based on thieno[2',3':4,5]thieno[3,2-b]indole for efficient organic solar cells

Synthetic Metals, Год журнала: 2024, Номер 310, С. 117785 - 117785

Опубликована: Ноя. 14, 2024

Язык: Английский

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