C-shaped ortho-benzodipyrrole-based acceptors with different electronic effects of top substituents for as-cast green-solvent processed high-performance organic solar cells

Energy & Environmental Science, Год журнала: 2024, Номер 17(18), С. 6844 - 6855

Опубликована: Янв. 1, 2024

We systematically investigated the effects of top substituents on physicochemical properties SMAs and achieved highest PCE for OSCs processed using a non-halogenated solvent without any extra treatment.

Язык: Английский

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C-Shape or S-Shape? The Molecular Geometry Control of Fused-Ring Nonfullerene Acceptors for Lower Energy Loss in Organic Solar Cells

ACS Energy Letters, Год журнала: 2024, Номер 9(4), С. 1786 - 1795

Опубликована: Март 28, 2024

To elucidate the pivotal influence of molecular geometry in fused-ring nonfullerene acceptors (FRNFAs) on material properties and device performance organic solar cells (OSCs), we designed synthesized two isomeric molecules C–F S–F, featuring C-shaped S-shaped geometries with acceptor–donor–acceptor conjugated framework. The alteration demonstrated negligible effects optical electrochemical properties. Significantly, single crystal X-ray crystallography analyses uncovered that exhibited a wave network packing, while S–F favored linear brick packing intermolecular end groups, different from previously reported three-dimensional (3D) stacking Y series FRNFAs. Despite absence 3D OSCs utilizing remarkable power conversion efficiency 17.0%, lower voltage loss compared to devices based S–F. This study further underscores essential role FRNFAs, providing valuable insights for future design high-performance OSCs.

Язык: Английский

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19.36% Efficiency Organic Solar Cells Based on Low‐Cost Terpolymer Donors with Simple Molecular Structures

Advanced Functional Materials, Год журнала: 2024, Номер 34(44)

Опубликована: Май 19, 2024

Abstract Low cost and high performance are key elements for the industrialization of organic solar cells (OSCs). In view this, developing highly‐efficient photovoltaic molecules with simple chemical structure is one most effective countermeasures. Herein, three simple‐structure terpolymers PTQ12‐5, PTQ12‐10, PTQ12‐15 designed synthesized, by embedding difluoro‐substituted bithiophene (2T‐2F) unit into backbone low‐cost high‐efficiency polymer PTQ10. The synthesis contains only two‐step synthetic routes over 85% yields from cheap raw compounds, thus exhibiting distinctly characteristic. Remarkably, PTQ12‐5 shows significantly higher absorbance coefficient hole mobility than Consequently, PTQ12‐5‐based OSCs more efficient exciton dissociation charge transfer, suppressed carrier recombination, tighter molecular π‐π stacking, faster balanced transport, demonstrates a improved efficiency 18.77% that PTQ10‐based device (18.03%). Moreover, an outstanding 19.36% achieved in ternary further modulating energy level alignment blending features photoactive molecules, which highest based on polymers to date. This work has significant implications guiding design high‐performance materials.

Язык: Английский

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Suppressing Exciton–Vibration Coupling via Intramolecular Noncovalent Interactions for Low‐Energy‐Loss Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер unknown

Опубликована: Дек. 3, 2024

Minimizing energy loss is crucial for breaking through the efficiency bottleneck of organic solar cells (OSCs). The main mechanism can be attributed to non-radiative recombination (ΔEnr) that occurs due exciton-vibration coupling. To tackle this challenge, tuning intramolecular noncovalent interactions strategically utilized tailor novel fused ring electron acceptors (FREAs). Upon comprehensive analysis both theoretical and experimental results, approach effectively enhance molecular rigidity, suppress structural relaxation, reduce exciton reorganization energy, weakens coupling strength. Consequently, binary OSC device based on Y-SeSe, which features dual strong Se ⋅ O interactions, achieves an outstanding power conversion (PCE) 19.49 %, accompanied by extremely small ΔEnr 0.184 eV, much lower than those Y-SS Y-SSe devices with weaker interactions. These achievements not only set record selenium-containing OSCs, but also mark lowest reported value among high-performance devices. Furthermore, ternary blend showcases a remarkable PCE 20.51 one highest PCEs single-junction OSCs. This work demonstrates effectiveness in suppressing coupling, thereby achieving low-energy-loss high-efficiency

Язык: Английский

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Chlorine‐Mediated Dispersion Modulates Packing Arrangement of Asymmetric Acceptors for High‐Performance Organic Solar Cells

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Фев. 5, 2025

Abstract This study focuses on the synthesis and performance of non‐fullerene acceptors (NFAs) with varying chlorine dispersion in organic solar cells (OSCs). Four chlorine‐mediated acceptors, BO3Cl‐ a , γ β BOEH3Cl‐ are synthesized isomeric terminal groups then integrated donor PBDB‐TF to fabricate OSCs. It finds that increased improves device efficiency enhanced current ‐based devices achieving power conversion (PCE) over 19%, which is one highest values reported for asymmetrically chlorinated acceptors. In OSC devices, Enhanced exciton dissociation reduced carrier recombination observed more dispersion, along improved charge transport due modulation molecular packing active layer. Furthermore, transient absorption spectroscopy elucidates augments diffusion time, thereby elevating density while branching strategy further amplify lifetime preserving value short face spectral blue shifts it. The findings suggest key factor enhancing by progressive arrangement aggregation behaviors.

Язык: Английский

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Novel Long-Conjugated Backbone-Based Non-Fullerene Acceptors for Efficient and Eco-Friendly Ternary Organic Solar Cells

Sustainability, Год журнала: 2025, Номер 17(2), С. 512 - 512

Опубликована: Янв. 10, 2025

Organic solar cells (OSCs) are made from carbon-rich organic compounds with low environmental impacts, unlike the silicon in traditional panels. Some of these materials can be broken down and reprocessed, enabling recovery valuable components. Specifically, active-layer that make up OSCs designed sustainability mind. However, it is important to note practical active used for commercialization still an area research development due their efficiency/stability processability. Herein, we synthesized three A-D-A’-D-A-type long-conjugated non-fullerene acceptors (NFAs) by incorporating various electron-withdrawing groups into benzothiadiazole-diindacenodithiophene core. These NFAs, changing end-capping groups, exhibit not only distinct physical, optical, electrochemical properties, but also differences crystallinity exciton dissociation. As a result, they exhibited significant photovoltaic performance PM6 donor-based binary devices. The introduction small amounts NFAs as third component PM6:BTP-eC9 blend significantly enhanced its photon harvesting capabilities influenced charge transfer dynamics. Finally, achieved remarkable power conversion efficiency nearly 17% utilizing eco-friendly solvent. This study provides insights efficient OSCs.

Язык: Английский

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New Avenues for Organic Solar Cells Using Intrinsically Charge-Generating Materials

JACS Au, Год журнала: 2024, Номер 4(4), С. 1295 - 1302

Опубликована: Март 18, 2024

The molecular electron acceptor material Y6 has been a key part of the most recent surge in organic solar cell sunlight-to-electricity power conversion efficiency, which is now approaching 20%. Numerous studies have sought to understand fundamental photophysical reasons for exceptional performance and its growing family structural derivatives. Though significant uncertainty about several details remains, many concluded that initially photogenerated excited states rapidly convert into electron–hole charge pairs neat material. These are characterized by location hole on different molecules, contrast Frenkel excitons dominate behavior semiconductor materials. Here, we summarize current state knowledge regarding photophysics observations led it. We then link this understanding other advances, such as role quadrupolar fields donor–acceptor blends, importance interactions organization providing basis Y6′s properties. Finally, turn our attention ways making use new Y6, suggest doping, crystal structure tuning, electric field engineering promising avenues future exploration.

Язык: Английский

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Unraveling the Solution Aggregation Structures and Processing Resiliency of High‐Efficiency Organic Photovoltaic Blends

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Авг. 7, 2024

The solution aggregation structure of conjugated polymers is crucial to the morphology and resultant optoelectronic properties organic electronics considerable interest in field. Precise characterizations structures photovoltaic (OPV) blends their temperature-dependent variations remain challenging. In this work, three representative high-efficiency OPV using small-angle X-ray/neutron scattering are systematically probed. Three cases processing resiliency elucidated state-of-the-art blends. exceptional PBQx-TF can be attributed minimal changes multiscale at elevated temperatures. Importantly, a new parameter, percentage acceptors distributed within polymer aggregates (Ф), for first time blend solution, establishes direct correlation between Ф performance quantified. device well correlated with Kuhn length cylinder related L

Язык: Английский

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Optimizing Molecular Packing via Steric Hindrance for Reducing Non‐Radiative Recombination in Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(30)

Опубликована: Май 11, 2024

Abstract Innovative molecule design strategy holds promise for the development of next‐generation acceptor materials efficient organic solar cells with low non‐radiative energy loss ( ΔE nr ). In this study, we designed and prepared three novel acceptors, namely BTP‐Biso, BTP‐Bme BTP‐B, sterically structured triisopropylbenzene, trimethylbenzene benzene as side chains inserted into shoulder central core. The progressively enlarged steric hindrance from BTP‐B to BTP‐Biso induces suppressed intramolecular rotation altered packing mode in their aggregation states, leading significant changes absorption spectra levels. By regulating intermolecular π–π interactions, possesses relatively reduced recombination rate extended exciton diffusion lengths. binary device based on PB2 : exhibits an impressive power conversion efficiency (PCE) 18.5 % a 0.19 eV. Furthermore, ternary comprising PBDB‐TF achieves outstanding PCE 19.3 %. study proposed new perspectives developing high‐performance acceptors OSCs.

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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