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

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(17), С. 12011 - 12019

Опубликована: Апрель 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

Язык: Английский

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Sensitive Organic Photodetectors With Spectral Response up to 1.3 µm Using a Quinoidal Molecular Semiconductor

Advanced Materials, Год журнала: 2024, Номер 36(19)

Опубликована: Фев. 15, 2024

Abstract Detecting short‐wavelength infrared (SWIR) light has underpinned several emerging technologies. However, the development of highly sensitive organic photodetectors (OPDs) operating in SWIR region is hindered by their poor external quantum efficiencies (EQEs) and high dark currents. Herein, high‐sensitivity SWIR‐OPDs with an efficient photoelectric response extending up to 1.3 µm reported. These OPDs utilize a new ultralow‐bandgap molecular semiconductor featuring quinoidal tricyclic electron‐deficient central unit multiple non‐covalent conformation locks. The SWIR‐OPD achieves unprecedented EQE 26% under zero bias even more impressive 41% –4 V at 1.10 µm, effectively pushing detection limit silicon photodetectors. Additionally, low energetic disorder trap density active layer lead significant suppression thermal‐generation carriers current, resulting excellent detectivity ( D sh * ) exceeding 10 13 Jones from 0.50 1.21 surpassing 12 1.30 bias, marking highest achievements for beyond date. Validation photoplethysmography measurements, spectrometer prototype 0.35–1.25 range, image capture 1.20 irradiation demonstrate extensive applications this SWIR‐OPD.

Язык: Английский

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Recent developments in indacenodithiophene and indacenodithienothiophene-based donor-acceptor conjugated polymers: From design to device performance in organic electronics

Progress in Polymer Science, Год журнала: 2024, Номер 151, С. 101804 - 101804

Опубликована: Фев. 23, 2024

Polymeric semiconductors based on donor-acceptor (D-A) conjugated polymers have emerged as a promising class of materials for various applications due to their excellent solution processability, low cost, and intrinsic flexibility. The use the indacenodithiophene (IDT) unit building block has received significant attention its unique pentacyclic ring structure exceptional photophysical electronic properties. This review focuses latest progress in field IDT-based polymers. We discuss versatility IDT structural molecular engineering tool, along with electron-deficient acceptors comonomers modifications unit. These advancements led improved device performance, particularly organic electronics such photodetectors, solar cells, field-effect transistors, thermoelectric devices. In summary, this serves valuable reference researchers who are interested creating high-performance polymeric using range optoelectronic

Язык: Английский

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Layer‐by‐Layer Organic Solar Cells Enabled by 1,3,4‐Selenadiazole‐Containing Crystalline Small Molecule with Double‐Fibril Network Morphology

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(21)

Опубликована: Март 27, 2024

A double-fibril network of the photoactive layer morphology is recognized as an ideal structure facilitating exciton diffusion and charge carrier transport for high-performance organic solar cells (OSCs). However, in layer-by-layer processed OSCs (LbL-OSCs), polymer donors small molecule acceptors (SMAs) are separately deposited, it challenging to realize a fibril pure SMAs with absence tight interchain entanglement polymers. In this work, crystalline (SMDs), named TDZ-3TR SeDZ-3TR, were designed introduced into L8-BO acceptor solution, forcing phase separation molecular fibrilization. SeDZ-3TR showed higher crystallinity lower miscibility than TDZ-3TR, enabling more driving force favor better fibrilization L8-BO. On other hand, two donor polymers PM6 D18 different widths lengths put together optimize layer. The simultaneously optimization layers resulted impressive power conversion efficiency (PCE) 19.38 % LbL-OSCs.

Язык: Английский

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Recent Advances in Polymorphism of Organic Solar Cells

Small, Год журнала: 2025, Номер unknown

Опубликована: Янв. 13, 2025

Abstract As organic solar cells (OSCs) achieve notable advancements, a significant consensus has been highlighted that the device performance is intricately linked to active layer morphology. With conjugated molecules being widely employed, intermolecular interactions exert substantial influence over aggregation state and morphology formation, resulting in distinct molecular packing motifs, also known as polymorphism. This phenomenon closely associated with processing conditions exerts profound impact on functional properties. Consequently, understanding mechanisms underlying polymorphism formation establishing definitive correlation between photophysical behavior crucial for driving high‐performance OSCs. In this review, comprehensive synthesis of recent developments provided emphasizing its pivotal role field OSC The thermodynamic kinetic principles governing are examined. Then, representative polymorphisms classified materials, segmenting them into homopolymers, copolymers, IDTT‐ BTP‐based small molecules. Additionally, prevalent strategies evaluated manipulating review culminates an analysis critical effects OSCs, including charge carrier characteristics, photovoltaic efficiency, long‐term stability. By offering novel perspectives practical insights, work seeks guide future efforts morphological optimization high‐efficiency

Язык: Английский

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Furoic acid-doped-over-oxidized poly (3, 4-ethylenedioxythiophene)-based electrochemical sensor for selective, sensitive and concurrent quantification of paracetamol, codeine phosphate and caffeine in pharmaceutical formulation

Journal of materials research/Pratt's guide to venture capital sources, Год журнала: 2025, Номер unknown

Опубликована: Янв. 17, 2025

Язык: Английский

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A dendritic hexamer acceptor enables 19.4% efficiency with exceptional stability in organic solar cells

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

Опубликована: Янв. 20, 2025

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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Crystallization‐Driven Optimization of Morphology and Performance in Near‐Infrared Organic Photodetectors via Alkyl Side Chain Tuning of Narrow Bandgap Non‐Fullerene Acceptors

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

Опубликована: Апрель 9, 2024

Abstract Narrow bandgap non‐fullerene acceptors (NBG NFAs) are crucial in advancing near‐infrared organic photodetectors (NIR OPDs). However, the polymorphous behavior of NFAs introduces energetic disorder and charge‐trapping sites bulk heterojunction (BHJ) active layers, thereby hindering NIR performance OPDs. This study demonstrates design optimization molecular structures alkyl side chains to morphologically address these electrical limitations shed light on how affect crystallization‐driven control morphogenesis process BHJ layers. The structure, linearity, length chain molecules strategically designed controlled synthesize a series NBG NFAs, namely COT‐R (R = EH, BO, Oct, or Dod). in‐depth quantitative investigations into morphological factors reveal that side‐chain effectively enhances various properties, such as alignment compatibility between components layer, resulting mitigation disorders charge traps Therefore, optimized system, comprising COT‐Oct blended with PTB7‐Th, achieves reduced dark current increased responsivity, contributing development high‐performance OPDs an impressive specific detectivity 1.49 × 10 12 Jones at 1000 nm under ‐0.5 V.

Язык: Английский

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Binary Organic Solar Cells with Exceeding 19% Efficiency via the Synergy of Polyfluoride Polymer and Fluorous Solvent

Advanced Materials, Год журнала: 2024, Номер 36(30)

Опубликована: Май 11, 2024

Rational molecular design and suitable device engineering are two important strategies to boost the efficiencies in organic solar cells (OSCs). Yet these approaches independently developed, while their synergy is believed be more productive. Herein, a branched polyfluoride moiety, heptafluoroisopropoxyl group, introduced into side chains of conjugated polymers for first time. Compared with conventional alkyl chain, this chain can endow resulting polymer namely PF7 highly packing order strong crystallinity owing polarization fluorine-induced interactions, good solubility moderate miscibility retained. As result, comprehensively outperforms state-of-the-art PM6 photovoltaic properties. More importantly, based on groups fluorous solvents, new post-treatment denoted as solvent vapor annealing (FSVA) proposed match PF7. Differing from existing post-treatments, FSVA selectively reorganize fluoropolymer molecules but less impact small blend films. By employing solvent, achieves remarkable efficiency 19.09%, which among best binary OSCs. The treatment exhibit excellent universality various OSCs different material combinations or architectures.

Язык: Английский

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