A Vinylene‐Linker‐Based Polymer Acceptor Featuring a Coplanar and Rigid Molecular Conformation Enables High‐Performance All‐Polymer Solar Cells with Over 17% Efficiency

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(27)

Published: March 22, 2022

State-of-art Y-series polymer acceptors are typically based on a mono-thiophene linker, which can cause some twisted molecular conformations and thus limit the performance of all-polymer solar cells (all-PSCs). Here, high-performance acceptor vinylene linkers is reported, leads to surprising changes in polymers' conformations, optoelectronic properties, enhanced photovoltaic performance. It found that thiophene or bithiophene (PY-T-γ PY-2T-γ) display significant twisting between end-groups linker units, while vinylene-based (PY-V-γ) exhibits more coplanar rigid conformation. As result, PY-V-γ demonstrates better conjugation tighter interchain stacking, results higher mobility reduced energetic disorder. Furthermore, detailed morphology investigations reveal PY-V-γ-based blend high domain purity fill factor its all-PSCs. With these, efficiency 17.1% achieved all-PSCs, highest reported for binary all-PSCs date. This work vinylene-linker superior unit build with chain conformation, beneficial aggregation efficient

Language: Английский

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Cyano‐Functionalized n‐Type Polymer with High Electron Mobility for High‐Performance Organic Electrochemical Transistors

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(24)

Published: April 16, 2022

n-Type organic mixed ionic-electronic conductors (OMIECs) with high electron mobility are scarce and highly challenging to develop. As a result, the figure-of-merit (µC*) of n-type electrochemical transistors (OECTs) lags far behind p-type analogs, restraining development OECT-based low-power complementary circuits biosensors. Here, two donor-acceptor (D-A) polymers based on fused bithiophene imide dimer f-BTI2 as acceptor unit thienylene-vinylene-thienylene (TVT) donor co-unit reported. The cyanation TVT enables polymer f-BTI2g-TVTCN simultaneously enhanced ion-uptake ability, film structural order, charge-transport property. it is able obtain volumetric capacitance (C*) 170 ± 22 F cm-3 record OECT (μe,OECT ) 0.24 cm2 V-1 s-1 for f-BTI2g-TVTCN, subsequently achieving state-of-the-art µC* 41.3 cm-1 geometry-normalized transconductance (gm,norm 12.8 S in accumulation-mode OECTs. In contrast, only moderate 1.50 measured non-cyanated f-BTI2g-TVT. These remarkable results demonstrate great power cyano functionalization semiconductors developing OMIECs substantial aqueous environment high-performance

Language: Английский

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Recent Research Progress of Organic Small‐Molecule Semiconductors with High Electron Mobilities

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(11)

Published: Dec. 15, 2022

Organic electronics has made great progress in the past decades, which is inseparable from innovative development of organic electronic devices and diversity semiconductor materials. It worth mentioning that both these advances are inextricably linked to high-performance materials, especially representative n-type small-molecule materials with high electron mobilities. The small molecules have advantages simple synthesis process, strong intermolecular stacking, tunable molecular structure, easy functionalize structures. Furthermore, a remarkable important component for constructing complementary logic circuits p-n heterojunction Therefore, semiconductors play an extremely role field basis industrialization functional devices. This review focuses on modification strategies mobility at level, discusses detail applications field-effect transistors, light-emitting photodetectors, gas sensors.

Language: Английский

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Switching p-type to high-performance n-type organic electrochemical transistors via doped state engineering

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Oct. 10, 2022

High-performance n-type organic electrochemical transistors (OECTs) are essential for logic circuits and sensors. However, the performances of OECTs lag far behind that p-type ones. Conventional wisdom posits LUMO energy level dictates performance. Herein, we show engineering doped state is more critical OECT polymers. By balancing charges to donor moiety, could effectively switch a polymer high-performance material. Based on this concept, polymer, P(gTDPP2FT), exhibits record high performance with μC* 54.8 F cm-1 V-1 s-1, mobility 0.35 cm2 response speed τon/τoff = 1.75/0.15 ms. Calculations comparison studies conversion primarily due uniform charges, stabilized negative polaron, enhanced conformation, backbone planarity at negatively charged states. Our work highlights role understanding polymers'

Language: Английский

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Dopant‐Free Bithiophene‐Imide‐Based Polymeric Hole‐Transporting Materials for Efficient and Stable Perovskite Solar Cells

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(49)

Published: Oct. 3, 2022

The development of hole-transport materials (HTMs) with high mobility, long-term stability, and comprehensive passivation is significant for simultaneously improving the efficiency stability perovskite solar cells (PVSCs). Herein, two donor-acceptor (D-A) conjugated polymers PBTI PFBTI alternating benzodithiophene (BDT) bithiophene imide (BTI) units are successfully developed desirable hole mobilities due to good planarity extended conjugation molecular backbone. Both copolymers can be employed as HTMs suitable energy levels efficient defect passivation. Shortening alkyl chain BTI unit introducing fluorine atoms on BDT moiety effectively enhances mobility hydrophobicity HTMs, leading improved PVSCs. As a result, organic-inorganic hybrid PVSCs HTM deliver power conversion (PCE) 23.1% enhanced operational ambient which one best efficiencies reported dopant-free polymeric date. Moreover, applied in inorganic perovskite/organic tandem cells, achieving PCE 17.4% 22.2%, respectively. These results illustrate great potential an widely applicable cost-effective stable

Language: Английский

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Unraveling the Correlations between Mechanical Properties, Miscibility, and Film Microstructure in All‐Polymer Photovoltaic Cells

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(30)

Published: May 6, 2022

Abstract The rapid development of low bandgap polymer acceptors has promoted the efficiency up to ≈17% for all‐polymer solar cells (all‐PSCs). Nevertheless, polymeric blend film, core photoelectric conversion all‐PSCs, not been thoroughly understood in terms influence and regulatory factors mechanical properties, which hinders advances flexible wearable applications. Herein, a range characterization methods is combined investigate miscibility, film microstructure blends based on several representative donors (PTzBI‐Si, PTVT‐T, PM6 PTQ10) benchmark acceptor N2200, further reveal miscibility‐property relationships miscibility property. results stress that fracture behaviors elastic moduli these with varied compositions show different changing trends, are affected by molecular interactions aggregated structure blends. four can be nicely predicted models deduced from macromolecular mechanics. Most crucially, correlations between modulus, morphology, elucidated first time. derived validated another high‐efficiency will key successful fabrication mechanically robust stretchable all‐PSCs high efficiency.

Language: Английский

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Terpolymerization and Regioisomerization Strategy to Construct Efficient Terpolymer Donors Enabling High‐Performance Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(30)

Published: April 19, 2023

Terpolymerization and regioisomerization strategies are combined to develop novel polymer donors overcome the difficulty of improving organic solar cells (OSCs) performance. Two isomeric units, bis(2-hexyldecyl)-2,5-bis(4-chlorothiophen-2-yl)thieno[3,2-b]thiophene-3,6-dicarboxylate (TTO) bis(2-hexyldecyl) 2,5-bis(3-chlorothiophen-2-yl)thieno[3,2-b]thiophene-3,6-dicarboxylate (TTI), obtained incorporated into PM6 backbone via random copolymerization form a series terpolymers. Interestingly, it is found that different chlorine (Cl) substituent positions can significantly change molecular planarity electrostatic potential (ESP) owing steric hindrance effect heavy Cl atom, which leads aggregation behaviors miscibility between donor acceptor. The TTO unit features higher number multiple S···O non-covalent interactions, more positive ESP, fewer isomer structures than TTI. As result, terpolymer PM6-TTO-10 exhibits much better coplanarity, stronger crystallinity, obvious behavior, proper phase separation in blend film, conducive efficient exciton dissociation charge transfer. Consequently, PM6-TTO-10:BTP-eC9-based OSCs achieve champion power conversion efficiency 18.37% with an outstanding fill factor 79.97%, among highest values reported for terpolymer-based OSCs. This work demonstrates terpolymerization approach achieving high-performance donors.

Language: Английский

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More Is Better: Dual-Acceptor Engineering for Constructing Second Near-Infrared Aggregation-Induced Emission Luminogens to Boost Multimodal Phototheranostics

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(41), P. 22776 - 22787

Published: Oct. 9, 2023

The manipulation of electron donor/acceptor (D/A) shows an endless impetus for innovating optical materials. Currently, there is booming development in donor design, while research on acceptor engineering has received limited attention. Inspired by the philosophical idea "more different", two systems with D'-D-A-D-D' (1A system) and D'-D-A-A-D-D' (2A structures based were designed studied. It was demonstrated that 1A system presented a weak aggregation-induced emission (AIE) to aggregation-caused quenching (ACQ) phenomenon, along increased electrophilicity planarity. In sharp contrast, 2A one more exhibited opposite ACQ-to-AIE transformation. Interestingly, fluorophore electron-deficient A-A moiety displayed superior AIE activity. More importantly, all compounds showed significantly higher molar absorptivity (ε) comparison their counterparts system. Thanks highest ε, near-infrared-II (NIR-II, 1000-1700 nm) emission, desirable property, favorable reactive oxygen species (ROS) generation, high photothermal conversion efficiency, representative member handily performed fluorescence-photoacoustic-photothermal multimodal imaging-guided photodynamic-photothermal collaborative therapy efficient tumor elimination. Meanwhile, NIR-II fluorescence imaging blood vessels lymph nodes living mice also accomplished. This study provides first evidence dual-connected tactic could be new molecular design direction effect, resulting aggregation-intensified improved ROS heat generation capacities phototheranostic agents.

Language: Английский

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An n‐Type Conjugated Polymer with Low Crystallinity for High‐Performance Organic Thermoelectrics

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(20)

Published: March 8, 2024

Abstract Conjugated polymers (CPs) with low crystallinity are promising candidates for application in organic thermoelectrics (OTEs), particularly flexible devices, because the disordered structures of these CPs can effectively accommodate dopants and ensure robust resistance to bending. However, n‐doped usually exhibit poor thermoelectric performance, which hinders development high‐performance generators. Herein, we report an n‐type CP (ThDPP‐CNBTz) comprising two acceptor units: a thiophene‐flanked diketopyrrolopyrrole cyano‐functionalized benzothiadiazole. ThDPP‐CNBTz shows LUMO energy level below −4.20 eV features crystallinity, enabling high doping efficiency. Moreover, dual‐acceptor design enhances polaron delocalization, resulting good performance. After n‐doping, exhibits average electrical conductivity ( σ ) 50.6 S cm −1 maximum power factor (PF) 126.8 μW m K −2 , is among highest values reported solution‐processed date. Additionally, OTE device based on doped PF 70 ; also remarkable bending strain, only marginal change after 600 cycles. The findings presented this work will advance devices particular.

Language: Английский

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π‐Conjugated Polymers for High‐Performance Organic Electrochemical Transistors: Molecular Design Strategies, Applications and Perspectives

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 2, 2025

Abstract The last decade has witnessed significant progress in organic electrochemical transistors (OECTs) due to their enormous potential applications various bioelectronic devices, such as artificial synapses, biological interfaces, and biosensors. remarkable advance this field is highly powered by the development of novel mixed ionic/electronic conductors (OMIECs). π‐Conjugated polymers (CPs), which are widely used optoelectronics, emerging key channel materials for OECTs. In review, after briefly introducing OECT, we then mainly focus on latest CPs high‐performance correlations structure, basic physicochemical properties, device performance elucidated evaluating electronic characters, optoelectronic OECT performance. Then, CP‐based OECTs presented. Finally, discuss several remaining issues or challenges give our insights into advancing enhanced

Language: Английский

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