π-Extended Nonfullerene Acceptor for Compressed Molecular Packing in Organic Solar Cells To Achieve over 20% Efficiency

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(17), P. 12011 - 12019

Published: April 19, 2024

Organic photovoltaics (OPVs) suffer from a trade-off between efficient charge transport and suppressed nonradiative recombination due to the aggregation-induced luminance quenching of organic semiconductors. To resolve this grand challenge, π-extended nonfullerene acceptor (NFA) B6Cl with large voids among honeycomb network is designed introduced into photovoltaic systems. We find that presence small amount (i.e., 0.5 or 1 wt %) can compress molecular packing host L8-BO, leading shortened π–π stacking distance 3.59 3.50 Å (that will improve transport) together ordered alkyl chain inhibit energy loss C–C C–H bonds vibrations), as validated by high-energy X-ray scattering measurements. This morphology transformation ultimately results in simultaneously improved JSC, FF, VOC OPVs. As result, maximum PCEs PM6:L8-BO D18:L8-BO are increased 19.1 19.3% 19.8 20.2%, respectively, which highest values for single-junction The university increase performance OPVs further evidenced range polymer:NFA

Language: Английский

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Non‐halogenated Solvent‐Processed Organic Solar Cells with Approaching 20 % Efficiency and Improved Photostability

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(22)

Published: March 25, 2024

The development of high-efficiency organic solar cells (OSCs) processed from non-halogenated solvents is crucially important for their scale-up industry production. However, owing to the difficulty regulating molecular aggregation, there a huge efficiency gap between and halogenated solvent OSCs. Herein, we fabricate o-xylene OSCs with approaching 20 % by incorporating trimeric guest acceptor named Tri-V into PM6:L8-BO-X host blend. incorporation effectively restricts excessive aggregation L8-BO-X, regulates packing optimizes phase-separation morphology, which leads mitigated trap density states, reduced energy loss suppressed charge recombination. Consequently, PM6:L8-BO-X:Tri-V-based device achieves an 19.82 %, representing highest solvent-processed reported date. Noticeably, addition Tri-V, ternary shows improved photostability than binary PM6:L8-BO-X-based device, maintains 80 initial after continuous illumination 1380 h. This work provides feasible approach fabricating high-efficiency, stable, eco-friendly OSCs, sheds new light on large-scale industrial production

Language: Английский

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Over 18.8% Efficiency of Layer‐By‐Layer Organic Photovoltaics Enabled by Ameliorating Exciton Utilization in Acceptor Layer

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(16)

Published: Jan. 2, 2024

Abstract The layer‐by‐layer (LbL) organic photovoltaics (OPVs) are constructed with wide‐bandgap donor PM1 and narrow‐bandgap acceptor L8‐BO. exciton utilization near cathode is still challenging considering restricted diffusion distance of excitons inability for transferring energy from L8‐BO to PM1. Herein, incorporation into layer (DIA) strategy employed improve cathode. efficiency LbL OPVs can be improved 18.02% 18.81% by incorporating 10 wt% layer, which closely associated efficient separation originated more adequate donor/acceptor interface faster charge transfer, as evidenced magneto‐photocurrent transient absorption results. in situ test morphological characterization clarify that molecular packing property benefited prolonged aggregation nucleation time assisted DIA strategy, contributing transport inhibited recombination active layers. thickness insensitive also induced indicated PCE retention value (82.2% vs. 74.0%) PM1/L8‐BO:PM1 PM1/L8‐BO when increased ≈180 nm. This work demonstrates the effectiveness improving tolerance OPVs.

Language: Английский

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Suppressing Exciton‐Vibration Coupling to Prolong Exciton Lifetime of Nonfullerene Acceptors Enables High‐Efficiency Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(8)

Published: Jan. 5, 2024

Abstract The limited exciton lifetime ( τ , generally <1 ns) leads to short diffusion length L D ) of organic semiconductors, which is the bottleneck issue impeding further improvement power conversion efficiencies (PCEs) for solar cells (OSCs). However, efficient strategies prolong intrinsic are rare and vague. Herein, we propose a facile method efficiently reduce vibrational frequency molecular skeleton suppress exciton‐vibration coupling decrease non‐radiative decay rate thus via deuterating nonfullerene acceptors. remarkably increases from 0.90 ns (non‐deuterated L8‐BO) 1.35 (deuterated L8‐BO‐D), record photovoltaic materials. Besides, inhibited vibration improves planarity L8‐BO‐D enhanced coefficient. Consequently, 7.9 nm (L8‐BO) 10.7 (L8‐BO‐D). prolonged enables PM6 : L8‐BO‐D‐based bulk heterojunction OSCs acquire higher PCEs 18.5 % with more dissociation weaker charge carrier recombination than L8‐BO‐based counterparts. Moreover, benefiting D18/L8‐BO‐D‐based pseudo‐planar achieve an impressive PCE 19.3 %, among highest values. This work provides strategy increase boosting OSCs.

Language: Английский

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Over 19.2% efficiency of layer-by-layer organic photovoltaics enabled by a highly crystalline material as an energy donor and nucleating agent

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(14), P. 5173 - 5182

Published: Jan. 1, 2024

By introducing highly crystalline material D18A into donor layer acting as energy and nucleating agent, an optimal PCE of 19.25% was achieved for PM1 : D18A/L8-BO based OPVs.

Language: Английский

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High‐Performance Photoactive Polymers: Innovations in Ternary Polymerization for Solar Applications

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 2, 2025

Abstract In recent years, polymer solar cells (PSCs) have achieved rapid progress, with power conversion efficiencies (PCEs) reaching up to 20.25%, driven by significant advancements in device fabrication and active‐layer materials. The ternary polymerization strategy has proven be a straightforward effective approach for developing high‐performance photoelectric polymers incorporating third monomer into the backbone. This incorporation effectively optimizes intrinsic properties, including UV–vis absorption, energy levels, solubility, crystallinity, morphology, charge transfer, mechanical robustness, batch‐to‐batch reproducibility, stability. review highlights latest designing photoactive copolymers (both donors acceptors), particular focus on stability, potential applications commercial development. aim is provide valuable guidance development of materials using strategy.

Language: Английский

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Solution Sequential Deposition Pseudo‐Planar Heterojunction: An Efficient Strategy for State‐of‐Art Organic Solar Cells

Small Methods, Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 22, 2024

Abstract Organic solar cells (OSCs) are considered as a promising new generation of clean energy. Bulk heterojunction (BHJ) structure has been widely employed in the active layer efficient OSCs. However, precise regulation morphology BHJ is still challenging due to competitive coupling between crystallization and phase separation. Recently, novel pseudo‐planar (PPHJ) structure, prepared through solution sequential deposition, attracted much attention. It an easy‐to‐prepare which separation structures, interfaces, molecular packing can be separately controlled. Employing PPHJ properties OSCs, such power conversion efficiency, stability, transparency, flexibility, so on, usually better than its counterpart. Hence, comprehensive understanding film‐forming process, control, device performance should considered. In terms representative works about PPHJ, this review first introduces fabrication process layers based on structure. Second, applied control methods summarized. Then, influences other property reviewed, largely expand application. Finally, brief prospect development tendency devices discussed with consideration their challenges.

Language: Английский

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Flexible near-infrared organic photodetectors for emergent wearable applications

Wearable electronics., Journal Year: 2024, Volume and Issue: 1, P. 53 - 77

Published: May 13, 2024

With the evolution of Industry 4.0, next-generation wearable devices have come under spotlight, where organic electronics are playing an important role due to their flexible form factor, high performance, and integration capability. Designed conform soft dynamic surfaces, photodetectors (OPDs) integrated arrays stand out for application potential in non-invasive biosensing bio-imaging, with inherent advantages mitigating motion artifacts – a notable limitation traditional, rigid photodetector systems. Leveraging near-infrared (NIR) spectrum's capability deep skin penetration minimal scattering human tissues, NIR OPDs especially capable precise diagnostics enhanced signal quality. The adaptable factor further broadens applications human-environment interaction, marking shift towards more responsive intelligent technologies. This review summarizes latest challenges breakthroughs OPDs, emphasizing effective strategies toward high-performance device units We discuss remaining outlook on vast reshaping our interaction surroundings.

Language: Английский

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Hierarchical Solid‐Additive Strategy for Achieving Layer‐by‐Layer Organic Solar Cells with Over 19% Efficiency

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(34)

Published: June 14, 2024

Abstract Layer‐by‐layer (LbL) deposition of active layers in organic solar cells (OSCs) offers immense potential for optimizing performance through precise tailoring each layer. However, achieving high‐performance LbL OSCs with distinct solid additives layer remains challenging. In this study, we explore a novel approach that strategically incorporates different into specific devices. To end, introduce FeCl 3 the lower donor (D18) as p‐type dopant to enhance hole concentration and mobility. Concurrently, incorporate wide‐band gap conjugated polymer poly(9,9‐di‐n‐octylfluorenyl‐2,7‐diyl) (PFO) upper acceptor (L8‐BO) improve morphology prolong exciton lifetime. Unlike previous studies, our combines these two strategies achieve higher more balanced electron mobility without affecting device open‐circuit voltage, while also suppressing charge recombination. Consequently, power conversion efficiency (PCE) D18+FeCl /L8‐BO increases 18.12 %, D18/L8‐BO+PFO attains PCE 18.79 %. These values represent substantial improvements over control device′s 17.59 Notably, when both PFO are incorporated, /L8‐BO+PFO achieves remarkable 19.17 summary, research results demonstrate effectiveness layered additive strategy improving OSC performance.

Language: Английский

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Prolonging the exciton diffusion length by manipulating molecular stacking enables pseudo-planar heterojunction organic solar cells to achieve over 19% efficiency

Journal of Materials Chemistry A, Journal Year: 2024, Volume and Issue: 12(20), P. 12208 - 12215

Published: Jan. 1, 2024

A solid additive, SA-5F, is employed to promote molecular stacking, which leads higher crystallinity, boosting the exciton diffusion coefficient and then length. Thus, D18/Y6+-based PPHJ OSCs afford an impressive PCE of 19.11%.

Language: Английский

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