20.6% Efficiency Organic Solar Cells Enabled by Incorporating a Lower Bandgap Guest Nonfullerene Acceptor Without Open‐Circuit Voltage Loss

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 28, 2025

Abstract Simultaneously mitigating both photovoltage and photocurrent losses is crucial for organic solar cells (OSCs) to approach the Shockley–Queisser limit of ideal efficiency. Incorporating a narrower bandgap nonfullerene acceptor (NFA) as guest component into host donor:NFA system broadens absorption spectrum. However, this can also increase nonradiative decay rate according energy‐gap law. In work, ternary OSCs are constructed by combining narrow AQx‐2F (as NFA) with lower eC9 NFA), significantly enhancing generation without compromising photovoltage. The addition acts crystallization inducer, extending period increasing ordered packing distance. This leads suppressed trap states, elevated dielectric constant, prolonged exciton lifetime, balanced hole/electron transport, reduced recombination loss. Consequently, optimized D18:AQx‐2F:eC9 achieve champion power conversion efficiency (PCE) 20.6% high open‐circuit voltage 0.937 V, short‐circuit current density 27.2 mA cm −2 fill factor 80.8%, validated an independently certified PCE 20.0%, establishing new benchmark bulk heterojunction OSCs. work demonstrates effective method simultaneously mitigate losses, paving way high‐performance

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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The Critical Isomerization Effect of Core Bromination on Nonfullerene Acceptors in Achieving High‐Performance Organic Solar Cells with Low Energy Loss

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 30, 2024

Highly efficient nonfullerene acceptors (NFAs) for organic solar cells (OSCs) with low energy loss (E

Язык: Английский

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Excited state dynamics of azanaphthalenes reveal opportunities for the rational design of photoactive molecules

Communications Chemistry, Год журнала: 2025, Номер 8(1)

Опубликована: Янв. 9, 2025

Abstract Various photoactive molecules contain motifs built on aza-aromatic heterocycles, although a detailed understanding of the excited state photophysics and photochemistry in such systems is not fully developed. To help address this issue, non-adiabatic dynamics operating azanaphthalenes under hexane solvation was studied following 267 nm excitation using ultrafast transient absorption spectroscopy. Specifically, species quinoline, isoquinoline, quinazoline, quinoxaline, 1,6-naphthyridine, 1,8-naphthyridine were investigated, providing systematic variation relative positioning nitrogen heteroatom centres within bicyclic aromatic structure. Our results indicate considerable differences lifetimes, propensity for intersystem crossing vs internal conversion across molecular series. The overall pattern behaviour can be explained terms potential energy barriers spin-orbit coupling effects, as demonstrated by extensive quantum chemistry calculations undertaken at SCS-ADC(2) level theory. fact that achieve nuanced agreement with experimental data full set six exhibiting subtle variations their composition provides an excellent example current state-of-the-art indicative future opportunities rational design molecules.

Язык: Английский

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Aromatic Side Chain Manipulation in A-DA′D-A type Acceptors for Organic Photovoltaics

Materials Chemistry Frontiers, Год журнала: 2024, Номер 8(21), С. 3587 - 3595

Опубликована: Янв. 1, 2024

Three acceptors with different aromatic side chains were synthesized and the photovoltaic performance effects of steric hindrances studied. BTP-1-iPr better matches energy level PM6, obtaining higher V OC , FF PCE 17.19%.

Язык: Английский

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Efficient and Stable Organic Solar Cells Achieved by Synergistic Optimization of Extended End‐Capped Groups and Fluorinated Quinoxaline Central Cores in Nonfullerene Acceptors

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 14, 2024

Abstract Molecular stacking behavior exerts a significant influence on the blend film morphology of organic solar cells (OSCs), further affecting device performance and stability. Modulation molecular structure, such as central unit end‐group, can profoundly impact this process. Herein, four quinoxaline (Qx)‐fused‐core‐based non‐fullerene acceptors (NFAs), Qx‐N4F Qx‐ o/m/p ‐N4F are synthesized combining π‐extended end‐groups optimized units. The isomeric fluorinated units lead to changes in local dipole moments electrostatic potential distribution, which influences pattern photoelectronic properties NFAs. Consequently, binary ternary devices based PM6:Qx‐ p achieve superior power conversion efficiencies (PCE) up 18.75% 19.48%, respectively. Grazing‐incidence wide‐angle X‐ray scattering (GIWAXS) characterization reveals ‐N4F's stronger crystallinity, aggregation, donor–acceptor interactions, separately enhance short‐circuit current density ( J SC ) fill factor (FF) through higher phase purity tighter maintaining more interfaces. Furthermore, ‐N4F‐based demonstrate exceptional thermal stability, retaining 93.2% initial PCE value after 3000 h heating due best morphological stability with most stable structure. These results underscore significance synergistic optimization NFAs conjugation expansion halogenation substitution for obtaining efficient OSCs.

Язык: Английский

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Supramolecular force-driven non-fullerene acceptors as an electron-transporting layer for efficient inverted perovskite solar cells

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 14, 2025

Fullerene derivatives are widely employed as efficient electron-transporting layers (ETLs) in p-i-n perovskite photovoltaics but face challenges mitigating interfacial recombination losses and ensuring stable film morphology. Non-fullerene acceptors (NFAs), commonly utilized organic photovoltaics, present a promising alternative to fullerene-based ETLs. Nevertheless, the suboptimal performance of NFA-based devices underscores need for molecular engineering tailor their properties. Herein, we develop two Y-type NFAs, Y-Phen Y-CE, by substituting benzothiadiazole core Y6 with higher-polarity phenanthroline crown ether. These modifications effectively enhance carrier kinetics (1) promoting ordered assembly on surface through supramolecular interactions, thereby optimizing energetic alignment, (2) improving packing facilitate charge transport. Using Y-CE ETL, device achieves certified power conversion efficiency (PCE) 25.59%. Furthermore, optimized exhibits less than 10% degradation PCE after 1440 hours thermal aging. This work offers valuable insights into designing ETLs high-performance photovoltaics. The solar cells based non-fullerene acceptor layer engineering. Here, authors substitute ether, achieving

Язык: Английский

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Advancements in morphology controllable ternary organic solar cells for active layers

Renewable and Sustainable Energy Reviews, Год журнала: 2025, Номер 216, С. 115673 - 115673

Опубликована: Апрель 8, 2025

Язык: Английский

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Suppressing Non-Radiative Recombination and Tuning Morphology via Central Core Asymmetric Substitution for Efficient Organic Solar Cells

Nano Energy, Год журнала: 2024, Номер 131, С. 110204 - 110204

Опубликована: Сен. 6, 2024

Язык: Английский

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Improving Molecular Arrangement and Alleviating Nonradiative Energy Loss Using a Chlorinated Pyrido[3,4‐b]Quinoxaline‐Core‐Based Acceptor for High‐Performance Organic Solar Cells

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 26, 2024

Abstract The electron‐deficient A 1 unit in A‐DA D‐A structured acceptors is critical for optimizing the efficiency of organic solar cells (OSCs). Drawing inspiration from high performance previously reported pyrido[2,3‐ b ]quinoxaline‐core acceptors, Py6, an isomer Py1 designed with a repositioned pyridine nitrogen atom, and further modified it by chlorinating Py6 to create Py7. Theoretical calculations show that chlorine incorporation strengthens intermolecular non‐covalent interactions promotes tighter molecular stacking, as confirmed grazing‐incidence wide‐angle X‐ray scattering. Consequently, D18/Py7 device delivers enhanced fill factor short‐circuit current density, compared D18/Py1 D18/Py6 device. Notably, also yields higher open‐circuit voltage 0.871 V, significantly outperforming (0.764 V) (0.723 V), due low nonradiative energy losses. Further studies reveal introducing Cl directs hole density toward central pyrido[3,4‐ ]quinoxaline decreases charge transfer state ratio D18/acceptor. This prompts triplet‐to‐singlet conversion reduces non‐radiative recombination Additionally, using mutual donor–acceptor dilution strategy, (D18:1wt.% Py7)/(Py7:1wt.% D18) achieves impressive 19.60%. work emphasizes great potential Py‐series demonstrates effectively

Язык: Английский

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