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

Advanced Materials, Год журнала: 2022, Номер 35(11)

Опубликована: Дек. 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.

Язык: Английский

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Double Asymmetric Core Optimizes Crystal Packing to Enable Selenophene‐based Acceptor with Over 18 % Efficiency in Binary Organic Solar Cells

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(10)

Опубликована: Янв. 2, 2023

Side-chain tailoring is a promising method to optimize the performance of organic solar cells (OSCs). However, asymmetric alkyl chain-based small molecular acceptors (SMAs) are still difficult afford. Herein, we adopted novel n-nonyl/undecyl substitution strategy and synthesized two A-D1 A'D2 -A double isomeric SMAs with selenophene-based central core for OSCs. Crystallographic analysis indicates that AYT9Se11-Cl forms more compact order intermolecular packing compared AYT11Se9-Cl, which contributed higher electron mobility in neat film. Moreover, PM6 : blend film shows better morphology appropriate phase separation distinct face-on orientation than AYT11Se9-Cl. The OSCs obtain superior PCE 18.12 % AYT11Se9-Cl (17.52 %), best efficiency selenium-incorporated binary BHJ Our findings elucidate chains precisely modulates crystal enhances photovoltaic selenophene-incorporated SMAs.

Язык: Английский

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Recent Progress of Fluorinated Conjugated Polymers

Advanced Materials, Год журнала: 2024, Номер 36(32)

Опубликована: Июнь 3, 2024

Abstract In recent years, conjugated polymers have received widespread attention due to their characteristic advantages of light weight, favorable solution processability, and structural modifiability. Among various polymers, fluorinated ones developed rapidly achieve high‐performance n ‐type or ambipolar polymeric semiconductors. The uniqueness contains the high coplanarity structures, lower frontier molecular orbital energy levels, strong nonbonding interactions. this review, first building blocks, including benzene thiophene rings, B←N bridged units, fluoroalkyl side chains are summarized. Subsequently, different synthetic methods described, with a special focus on respective disadvantages. Then, these numerous structures appropriate bear in mind, properties applications such as cyclopentadithiophene‐, amide‐, imide‐based embedded systematically discussed. introduction fluorine atoms can further enhance electron‐deficiency backbone, influencing charge carrier transport performance. promising applied widely organic field‐effect transistors, solar cells, thermoelectric devices, other opto‐electric devices. Finally, outlook challenges future development is

Язык: Английский

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Dynamic bond interactions fine-tune the properties of multiple resonance emitters towards highly efficient narrowband green OLEDs

Chemical Science, Год журнала: 2023, Номер 14(12), С. 3326 - 3331

Опубликована: Янв. 1, 2023

Multiple resonance (MR) molecules based on a B/N polycyclic aromatic framework are the cutting-edge materials in field of organic light-emitting diodes (OLEDs) owing to their superb photophysical properties. Tailoring MR molecular with various functional groups toward ideal properties has become an emerging topic chemistry. Dynamic bond interactions versatile and powerful tools regulating materials. Herein, pyridine moiety, which presents high affinity form dynamic such as hydrogen bonds N→B dative bonds, was introduced into for first time, designed emitters synthesized feasible way. The introduction moiety not only maintained conventional emitters, but also endowed tunable emission spectra, narrowed emission, enhanced photoluminescence quantum yield (PLQY), intriguing supramolecular assembly solid state. Thanks overall superior brought by hydrogen-bond promoted rigidity, green OLEDs emitter exhibit excellent device performance external efficiency (EQE) up 38% small FWHM 26 nm, together good roll-off performance.

Язык: Английский

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NIR‐II Absorbing Monodispersed Oligomers Based on N−B←N Unit

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(42)

Опубликована: Авг. 28, 2023

Organic molecules with near-infrared II (NIR II) light absorption are essential for many biological and opto-electronic applications. Herein, we report monodispersed oligomers as NIR absorber using a new molecular design strategy of resonant N-B←N unit, i.e. balanced boron-nitrogen covalent bond (B-N) coordination (B←N). We synthesize series thiophene-fused 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (TB), which contains the repeating unit. The TB pentamer exhibits maximum wavelength 1169 nm, is longest reported so far. photodetectors (OPDs) tetramer electron acceptor shows specific detectivity 2.98×1011 Jones at 1180 nm under zero bias. This performance among best OPDs. These results indicate kind absorbing excellent materials.

Язык: Английский

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Boron- and Nitrogen-Embedded Polycyclic Arenes as an Emerging Class of Organic Semiconductors

Chemistry of Materials, Год журнала: 2023, Номер 35(24), С. 10277 - 10294

Опубликована: Дек. 11, 2023

The development of novel organic semiconductors has continuously promoted the field optoelectronics. During past decade, boron- and nitrogen-embedded (BN-embedded) polycyclic arenes have attracted considerable attention, enriching structural diversity providing a broad space for tuning their optoelectronic properties. application BN-embedded conjugated materials in different devices achieved excellent performance, e.g., high charge-carrier mobilities (μ > 1.0 cm2 V–1 s–1) field-effect transistors (OFETs), ultrapure electroluminescence (full-width at half-maximum ≤ 18 nm) light-emitting diodes (OLEDs), power conversion efficiency (PCE 19%) photovoltaics (OPVs). These advances make promising class high-performance semiconductors. Nevertheless, inherent relationship between BN-doping modes properties never been systematically discussed. In this Perspective, we aim to present an overview unique family by selecting representative examples. We will first outline characters modes, discuss effect on electronic structures arenes, finally showcase advanced applications emerging devices. hope bring together communities further promote semiconductor materials.

Язык: Английский

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Catalytic insertion of nitrenes into B-H bonds

Chemical Science, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

Catalytic insertion of nitrenes into B–H bonds produces unique compounds with chiral boron atoms.

Язык: Английский

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Incorporation of a Boron–Nitrogen Covalent Bond Improves the Charge-Transport and Charge-Transfer Characteristics of Organoboron Small-Molecule Acceptors for Organic Solar Cells

Molecules, Год журнала: 2023, Номер 28(2), С. 811 - 811

Опубликована: Янв. 13, 2023

An organoboron small-molecular acceptor (OSMA) MB←N containing a boron-nitrogen coordination bond (B←N) exhibits good light absorption in organic solar cells (OSCs). In this work, based on MB←N, OSMA MB-N, with the incorporation of covalent (B-N), was designed. We have systematically investigated charge-transport properties and interfacial charge-transfer characteristics along using density functional theory (DFT) time-dependent (TD-DFT). Theoretical calculations show that MB-N can simultaneously boost open-circuit voltage (from 0.78 V to 0.85 V) short-circuit current due its high-lying lowest unoccupied molecular orbital reduced energy gap. Moreover, large dipole shortens stacking greatly enhances electron mobility by up 5.91 × 10-3 cm2·V-1·s-1. Notably, excellent PTB7-Th/MB-N, owing more charge transfer states generated through direct excitation process intermolecular electric field mechanism, are expected improve OSCs performance. Together we demonstrate new develop building block B-N units. The computations also shed structure-property relationships provide in-depth theoretical guidance for application photovoltaic materials.

Язык: Английский

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High‐Performance Room Temperature Ammonia Sensors Based on Pure Organic Molecules Featuring B‐N Covalent Bond

Advanced Science, Год журнала: 2024, Номер 11(19)

Опубликована: Март 14, 2024

Exploring organic semiconductor gas sensors with high sensitivity and selectivity is crucial for the development of sensor technology. Herein, first time, a promising chemiresistive polymer P-BNT based on novel π-conjugated triarylboron building block reported, showcasing an excellent responsivity over 30 000 (Ra/Rg) against 40 ppm NH

Язык: Английский

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Ultra‐Small‐Bandgap Conjugated Polymers Based on an N−B←N Unit

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(24)

Опубликована: Апрель 11, 2023

Since the breakthrough of conductive polymers in 1977, scientists have made great efforts to create small band gap (Eg ) conjugated polymers. Two general strategies design Eg are quinoid structure and donor-acceptor structure. Ultrasmall <1.0 eV) always suffer from poor air stability because high-lying HOMO energy levels. In this work, we report a new strategy ultrasmall by N-B←N unit, i.e. balanced resonant boron-nitrogen covalent bond (B-N) coordination (B←N). The resulting polymer exhibits an 0.82 eV onset absorption wavelength >1500 nm. Moreover, excellent its low-lying LUMO/HOMO An unprecedented property is selective light infrared range (800-1500 nm) high transparency visible (400-780 nm). Using property, for first time, demonstrate application as transparent thermal-shielding coating layer on glass, which reduces indoor solar irradiation through window consequently power consumption cooling buildings cars summer.

Язык: Английский

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