High‐Efficiency Binary and Ternary Organic Solar Cells Based on Novel Nonfused‐Ring Electron Acceptors

Advanced Materials, Год журнала: 2023, Номер 36(7)

Опубликована: Окт. 9, 2023

Abstract In this study, three nonfused‐ring electron acceptors ( 2TT , 2TT‐C6‐F, and 2TT‐C11‐F ) with the same steric hindrance groups (2,4,6‐tripropylbenzene) are designed synthesized impact of electron‐withdrawing lateral alkyl side chains on performance binary ternary organic solar cells (OSCs) is explored. For OSCs, IC‐2F terminal undecyl display a red shifted absorption spectrum suitable energy levels, corresponding blend film exhibits appropriate phase separation crystallinity. Thus, OSCs based achieve an impressive power conversion efficiency 13.03%, much higher than efficiencies those (9.68%) 2TT‐C6‐F (12.11%). CC hexyl exhibit complementary cascade levels host system (D18:BTP‐eC9‐4F). Hence, remarkable 19.39%, ranking among highest reported values. The research yields comprehensive ‐series acceptors, demonstrating their great potential for fabrication high‐performance OSCs.

Язык: Английский

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Efficient all-small-molecule organic solar cells processed with non-halogen solvent

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Март 2, 2024

Abstract All-small-molecule organic solar cells with good batch-to-batch reproducibility combined non-halogen solvent processing show great potential for commercialization. However, of all-small-molecule are rarely reported and its power conversion efficiencies very difficult to improve. Herein, we designed synthesized a small molecule donor BM-ClEH that can take advantage strong aggregation property induced by intramolecular chlorine-sulfur non-covalent interaction improve molecular pre-aggregation in tetrahydrofuran corresponding micromorphology after film formation. Tetrahydrofuran-fabricated based on BM-ClEH:BO-4Cl achieved high 15.0% binary device 16.1% ternary under thermal annealing treatment. In contrast, weakly aggregated BM-HEH without bond is almost inefficient same conditions due poor disordered π-π stacking, indistinct phase separation exciton dissociation. This work promotes the development provides further guidance.

Язык: Английский

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Halogenation Strategy of Thiophene Derived Solvent Additives Enables Optimized Morphology for Organic Solar Cells with 19.17% Efficiency

Advanced Functional Materials, Год журнала: 2024, Номер 34(19)

Опубликована: Янв. 14, 2024

Abstract As simple and versatile tools, additives have been widely used to refine active layer morphology played a crucial role in boosting the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, three novel solvent named Th‐FSi, Th‐ClSi, Th‐BrSi with same backbone 2,5‐bis(trimethylsilyl)thiophene are designed synthesized by substituting different halogens fluorine, chlorine, bromine, respectively. Notably, Th‐ClSi exhibits more significant dipole moment engages non‐covalent interactions small‐molecule acceptor (SMA) L8‐BO, which slight adjustments intermolecular interaction, crystallinity, molecular packing PM6:L8‐BO layer. Consequently, OSCs incorporating outperform their Th‐FSi counterparts photo‐capturing, reduced energy loss, superior exciton dissociation, charge transfer properties, out‐coming yields an enhanced PCE 18.29%. Moreover, integrating near‐infrared absorbing SMA (BTP‐eC9) guest into matrix, absorption spectrum span 880–930 nm, resultant ternary achieve commendable 19.17%, ranking among highest efficiencies reported date is expanded. These findings underscore promise halogenated thiophene‐based as potent avenue for morphological fine‐tuning consequent enhancement OSCs.

Язык: Английский

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Over 18.2% efficiency of layer–by–layer all–polymer solar cells enabled by homoleptic iridium(III) carbene complex as solid additive

Science Bulletin, Год журнала: 2024, Номер 69(18), С. 2862 - 2869

Опубликована: Июль 15, 2024

Язык: Английский

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Defining Solid Additive's Pivotal Role on Morphology Regulation in Organic Solar Cells Produced by Layer‐by‐layer Deposition

Advanced Energy Materials, Год журнала: 2024, Номер 14(22)

Опубликована: Март 8, 2024

Abstract Herein, two emerging device optimization methods, solid additive and layer‐by‐layer (LBL) process, for organic solar cells (OSCs) are simultaneously studied. Through traditional blend cast recently proposed identical solvent LBL cast, BDCB (2‐monobromo‐1,3‐dichloro‐bezene), a benzene derivative, is used to improve the performance based on celebrity combination PM6:L8‐BO. The results reveal that finely optimized concentration in PM6 solution can push efficiency of 19.03% compared with only 18.12% while power conversion (PCE) changing trend determined by BDCB's ratio L8‐BO's precursor. morphology characterizations confirm there exists no significant stratification LBL‐processed devices, supported previously reported swelling‐intercalation‐phase separation (SIPS) model. Thereby, additive's 2D considered smart strategy tuning SIPS which various final states. This work not reports cutting‐edge binary OSCs, but also new insight deep understanding method‐based development.

Язык: Английский

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High Open‐Circuit Voltage Organic Solar Cells with 19.2% Efficiency Enabled by Synergistic Side‐Chain Engineering

Advanced Materials, Год журнала: 2024, Номер 36(26)

Опубликована: Март 28, 2024

Abstract Restricted by the energy‐gap law, state‐of‐the‐art organic solar cells (OSCs) exhibit relatively low open‐circuit voltage ( V OC ) because of large nonradiative energy losses (Δ E nonrad ). Moreover, trade‐off between and external quantum efficiency (EQE) OSCs is more distinctive; power conversion efficiencies (PCEs) are still <15% with s >1.0 V. Herein, electronic properties aggregation behaviors non‐fullerene acceptors (NFAs) carefully considered then a new NFA (Z19) delicately designed simultaneously introducing alkoxy phenyl‐substituted alkyl chains to conjugated backbone. Z19 exhibits hypochromatic‐shifted absorption spectrum, high‐lying lowest unoccupied molecular orbital level ordered 2D packing mode. The D18:Z19‐based blend film favorable phase separation face‐on dominated orientation, facilitating charge transport properties. Consequently, D18:Z19 binary devices afford an exciting PCE 19.2% high 1.002 V, surpassing Y6‐2O‐based devices. former highest reported date for Δ Z19‐ (0.200 eV) (0.155 lower than that Y6‐based (0.239 Indications design such NFA, considering could promote breakthrough in OSCs.

Язык: 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, Год журнала: 2024, Номер 63(10)

Опубликована: Янв. 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.

Язык: Английский

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Non-fullerene acceptors with high crystallinity and photoluminescence quantum yield enable >20% efficiency organic solar cells

Nature Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 29, 2025

Язык: Английский

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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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Extending Exciton Diffusion Length via an Organic‐Metal Platinum Complex Additive for High‐Performance Thick‐Film Organic Solar Cells

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 6, 2025

The long exciton diffusion length (LD) plays an important role in promoting dissociation, suppressing charge recombination, and improving the transport process, thereby performance of organic solar cells (OSCs), especially thick-film OSCs. However, limited LD hinders further improvement device as film thickness increases. Here, organic-metal platinum complex, namely TTz-Pt, is synthesized served a solid additive into D18-Cl:L8-BO system. addition TTz-Pt enhanced crystallinity blends, reduced energy disorder, trap density, decreased non-radiative recombination binding energy, which conducive to prolonging TTz-Pt-treated film, facilitating dissociation process along with inhibiting recombination. Consequently, D18:L8-BO:IDIC (100 nm) exhibits champion power conversion efficiency (PCE) 20.12% (certified 19.54%), one highest PCEs reported for OSCs date. Remarkably, record-breaking PCE 18.84% yielded active layer 300 nm. Furthermore, superior universality This work provides simple universal approach extending by introducing complex achieve highly efficient

Язык: Английский

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