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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Achieving Finely Optimized Morphology and Highly Efficient Layer-by-Layer Organic Solar Cells via Fluorinated Quinoxaline-Based Polymer Additives

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Апрель 7, 2025

Vertical phase-separated active layer morphology is essential for organic solar cells (OSCs), which can be effectively achieved through layer-by-layer (LbL) processing, enabling independent optimization of donor and acceptor layers. Here, we present a novel strategy to optimize the D18/L8-BO-based OSCs by incorporating polyfluoroquinoxaline-type polymer additives. Three quinoxaline-based polymers with varying fluorination contents, namely, P2FQx, P3FQx, P4FQx, were synthesized evaluated. Although these showed limited performance as standalone materials in bulk heterojunction (BHJ) devices, their use additives LbL-OSCs significantly enhanced device efficiency. These promoted D18 aggregation, L8-BO penetration, facilitated formation vertically interpenetrating donor/acceptor network. Among additives, P2FQx demonstrated best performance, an optimized achieving champion power conversion efficiency (PCE) 20.13% well high fill factor (FF) 80.13%. Our results highlight potential rationally designed address morphology-related challenges provide pathway further development high-performance scalable photovoltaic devices.

Язык: Английский

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Impact of Linking‐Site on Photovoltaic Performance of Giant Molecular Acceptors Containing N‐Type Linker

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 11, 2025

Abstract Connecting small molecule acceptors through conjugated or nonconjugated linker to form giant molecular (GMAs) represents a strategic approach enhancing the morphological stability of organic solar cells (OSCs). In this study, we employed benzothiadiazole (BT) as typical n ‐type design and synthesize two GMAs linking‐site isomerization: i‐BT‐DY o‐BT‐DY. Compared i‐BT‐DY, o‐BT‐DY exhibits enhanced crystallinity more favorable face‐on orientation but lower electron mobility. This can be well explained by theoretical calculations, demonstrates delocalized LUMO distribution significantly stronger intramolecular super‐exchange coupling (43.7 meV versus 22.2 for o‐BT‐DY). Additionally, also red‐shifted absorption. Combining these attributes, PM6: blend achieved an impressive power conversion efficiency (PCE) 18.86%. The PCE further increased 19.49% in ternary blend. As expected, OSCs based on both exhibit exceptional long‐term photostability (T85% >1000 hours). work deepens our understanding how linkers at different linking sites influence performance GMAs, concluding that interaction, rather than intermolecular, are primary factor affecting charge transport acceptors. it highlights potential components OSCs.

Язык: Английский

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Decoding the Role of Molecular Orientation in Conjugated Self‐Assembled Monolayers for High‐Performance Binary Organic Photovoltaics Approaching 20% Efficiency

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Апрель 10, 2025

Abstract Molecular orientation stands as the quintessential hallmark of conjugated self‐assembled monolayers (SAMs), which have recently catalyzed noteworthy advancements in organic photovoltaics (OPVs). Nevertheless, an unambiguous understanding these directional arrangements and their impact on optoelectronic properties remains elusive. To address this issue, herein three SAMs with representative orientations, i.e., edge‐on (BCZ‐1), tilt‐on (4PACz) face‐on (BCZ‐2) are meticulously designed. These orientations been rigorously validated by sum frequency generation vibrational spectroscopy first‐principles calculations. Remarkably, unequivocal correlation between molecular device performance is discerned. Particularly, oriented BCZ‐1 exhibits largest dipole moment normal to electrode, accompanied a dense uniform coverage. features collectively contribute its strongest work function increment for ultra‐fast hole extraction minimum interfacial carrier recombination. As result, champion power conversion efficiency 19.93% achieved devices based D18:L8‐BO active layer, representing one highest values reported binary bulk heterojunction OPVs. Besides, shows great potential practical applications due superior up‐scalability enhanced shelf‐stability. Overall, offers in‐depth insights into behaviors SAMs, opening new avenues unlock

Язык: Английский

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Efficient All-Small-Molecule Organic Solar Cells Based on an Asymmetric Coumarin-Anthracene Donor

ACS Applied Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 12, 2025

Язык: Английский

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Exploiting Bis‐Sulfonimide Featuring Multiple d–pπ Bonds to Construct Interlayers for Organic Solar Cells

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

Опубликована: Март 7, 2025

Herein, bis-sulfonimide (BSI), characterized by multiple d-pπ bonds rather than typical p-pπ bonds, is unprecedently utilized as a general and extendable building block to develop series of multifunctional cathode interlayer materials (CIMs) for organic solar cells (OSCs). An illustrative CIM, BSIz-TT-PDI, demonstrates favorable alcohol processability, superior work function tunability, appropriate energy levels, strong self-doping effect, decent crystallinity. These attributes contribute its high conductivity exceeding 5×10-3 S/cm, well precise optimization the interfacial connection between active layer metal cathode. Therefore, BSIz-TT-PDI-based OSCs delivers an outstanding efficiency 18.08 % using PM6:Y6 while retaining 84 initial performance after tracking at maximum power point under continuous illumination 1100 hours. Additionally, devices maintain over 94 optimal across film thickness range BSIz-TT-PDI from 5 90 nm. Moreover, exhibits compatibility with various layers, enabling record 19.80 PM6:BTP-eC9:L8-BO layer. This not only introduces new library water/alcohol-soluble n-type semiconductors containing BSI, also pioneers creation thickness-insensitive CIMs stable efficient integrating electron-withdrawing components bonds.

Язык: Английский

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Recent Advances in Thermo- and Photostabilities of Organic Solar Cells: Material Design and Morphology Control

Polymer science & technology., Год журнала: 2025, Номер unknown

Опубликована: Фев. 27, 2025

Язык: Английский

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Balance Processing and Molecular Packing via Structural Disordering in a Random Terpolymer for Over 19% Efficiency Non‐Halogenated Solvent Organic Solar Cells

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 4, 2025

Abstract Achieving commercial viability for organic solar cells (OSCs) requires non‐toxic, non‐halogenated solvent processing. However, poor solubility and suboptimal morphology of commonly used active layer materials have been limiting their applications high‐performance OSCs. This study introduces a novel random terpolymer, PM7‐TTz50, designed to overcome these challenges. By incorporating 50 mol% co‐planar thiophene‐thiazolothiazole (TTz) unit into the PM7 backbones, resulting terpolymer achieves enhanced in eco‐friendly solvents. Furthermore, PM7‐TTz50's strong aggregation tendency, coupled with high‐boiling‐point processing—which prolongs aggregate/crystal growth—enhances molecular stacking ordering. approach supports efficient charge transport minimizes non‐radiative recombination, yielding power conversion efficiencies (PCEs) exceeding 19% over 16% w/o additives. Additionally, PM7‐TTz50 demonstrates broad compatibility various non‐fullerene acceptors (NFAs), leading material uniformity reproducibility device fabrication.

Язык: Английский

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Exploiting Bis‐Sulfonimide Featuring Multiple d–pπ Bonds to Construct Interlayers for Organic Solar Cells

Angewandte Chemie, Год журнала: 2025, Номер unknown

Опубликована: Март 7, 2025

Abstract Herein, bis‐sulfonimide (BSI), characterized by multiple d ‐ p π bonds rather than typical bonds, is unprecedently utilized as a general and extendable building block to develop series of multifunctional cathode interlayer materials (CIMs) for organic solar cells (OSCs). An illustrative CIM, BSIz‐TT‐PDI, demonstrates favorable alcohol processability, superior work function tunability, appropriate energy levels, strong self‐doping effect, decent crystallinity. These attributes contribute its high conductivity exceeding 5×10 −3 S/cm, well precise optimization the interfacial connection between active layer metal cathode. Therefore, BSIz‐TT‐PDI‐based OSCs delivers an outstanding efficiency 18.08 % using PM6:Y6 while retaining 84 initial performance after tracking at maximum power point under continuous illumination 1100 hours. Additionally, devices maintain over 94 optimal across film thickness range BSIz‐TT‐PDI from 5 90 nm. Moreover, exhibits compatibility with various layers, enabling record 19.80 PM6:BTP‐eC9:L8‐BO layer. This not only introduces new library water/alcohol‐soluble n‐type semiconductors containing BSI, also pioneers creation thickness‐insensitive CIMs stable efficient integrating electron‐withdrawing components bonds.

Язык: Английский

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Controlling Morphology and Improving Stability with High-Boiling-Point Additive for Efficient Organic Solar Cells

ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Март 17, 2025

The rapid advancement of solar photovoltaic technology underscores the growing significance organic cells (OSCs) in renewable energy solutions. A critical challenge optimizing OSC performance lies achieving precise control over active layer nanomorphology. In this study, we innovatively introduce a high-boiling-point liquid additive, 1,2,4-trichlorobenzene (1,2,4-TCB), as superior alternative to conventional additive 1,8-diiodooctane (DIO). Compared DIO, 1,2,4-TCB significantly enhances molecular ordering acceptors and improves miscibility between donor (D18) acceptor (Y6) materials, leading notable increase power conversion efficiency (PCE) from 17.56% 18.80%. It has been revealed that promotes packing, particularly for molecules grazing incidence wide-angle X-ray scattering. contact angle measurements further demonstrate improved donor–acceptor miscibility, resulting an optimized bicontinuous interpenetrating network morphology. This morphology effectively exciton separation, facilitates charge transport, minimizes recombination losses. addition improvements, 1,2,4-TCB-based devices exhibit exceptional photostability (T80 = 981 h) storage stability 2708 h), outperforming their DIO-based counterparts. These findings not only establish potential additives like boosting but also provide promising strategy advance commercial viability technology.

Язык: Английский

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