Small Molecule: Polymer Blends for N‐type Organic Thin Film Transistors via Bar‐coating in Air

Liu, Xiaoyu; Shi, Yong; Zhou, Qian; Liu, Jie; Jiang, Lang; Han, Yang

doi:10.1002/cjoc.202100633

Cited by 8 publications

(3 citation statements)

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“…In some studies, the addition of polymers to increases the viscosity of the solution and suppress the dewetting behavior of small molecules can better meet the demand of crystal growth. [163][164][165][166] Pisula and co-workers [167] doped PMMA into the dip coating solution of α,ω-dihexylquaterthiophene (DH4T). They found that with the increase of mass fraction and molecular weight of PMMA, the DH4T crystal grew up, and the corresponding device mobility also improved significantly (Figure 13a-d).…”

Section: Supplementation Of Solutesmentioning

confidence: 99%

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Ren

Cao

2023

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as well as their application in organic optoelectronic devices, such as organic field-effect transistors (OFETs), organic light-emitting diodes (OLEDs), organic photovoltaics (OPVs), and other devices. [3][4][5][6][7][8][9][10][11] OFET is one of the basic devices to characterize electrical properties of OSCs and also has wide applications as the core component of organic electronic products, such as organic sensors, organic electronic circuits, wearable electronic devices, and so on. [12] Over these years, the performance of OSCs and their OFETs has been continuously improved, with the high carrier mobilities of transistors (µ) > 1-10 cm 2 V −1 s −1 . [13] In addition to optimizing the molecular structures and characteristics of OSCs (typically main-chain engineering and side-chain engineering), [14][15][16] another key factor in developing high-performance semiconductors and transistors is the processing technology. [17] It is well known that the electrical properties of OSCs not only depend on the molecular structures, but also are closely on the aggregation structures of the semiconductor thin films, resulting in two carrier transport modes: intramolecular band transport and intermolecular hopping transport. The carrier mobilities of the same OSC with different aggregated structures may differ by 10 or even 100 times, because the microstructure and the morphology of OSC films are influenced by many factors, such as intermolecular interaction, external forces, annealing, molecular self-assembly, and so on. [18][19][20] The common processing technologies of OSC thin films are mainly vacuum vapor deposition and solution processing. Vacuum deposition is only suitable for some small molecule semiconductors, and requires large equipments and high temperatures. So far, a great variety of solution processing methods [21] have been adopted to deposit semiconductor thin films, and spin coating is the most commonly used method in the laboratory. The process of spin coating is simple and suitable for small-area, but hard to prepare large-area uniform films, and more than 95% of the materials are wasted. [22] In addition, the orientation degree of the thin films prepared by spin coating is not high, and it is easier to form small-size spherulite crystals. Finally, the shear stress distribution is uneven during the spin-coating process, which makes it difficult to control the film morphology. [7] Solution-processable organic semiconductors are one of the promising materials for the next generation of organic electronic products, which call for high-performance materials and mature processing technologies. Among many solution processing methods, meniscus-guided coating (MGC) techniques have the advantages of large-area, low-cost, adjustable film aggregation, and good compatibility with the roll-to-roll process, showing good research results in the preparation of high-performance organic fieldeffect transistors. In this review, the types of MGC techniques are first listed and the relevant mechanisms (wetting mechanism, fluid...

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Section: Supplementation Of Solutesmentioning

confidence: 99%

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Ren

Cao

2023

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“…The introduction of electron‐withdrawing groups (EWGs), such as fluorine (F), [ 9‐16 ] cyano (CN), [ 17‐20 ] imide, [ 12,21‐24 ] amide, [ 21,25‐26 ] and carbonyl (C=O) [ 27 ] groups in building blocks is a common strategy to lower the HOMO and LUMO levels of CPs. Many building blocks containing F atom(s) have been reported for the synthesis of high‐performance n‐type or ambipolar conjugated polymers.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Chlorinated Conjugated Polymer Based on Chlorine‐ and Cyano‐substituted (E)‐1,2‐Di(thiophen‐2‐yl)ethane for Ambipolar and n‐Type Organic Thin‐film Transistors

Zhang

Dong

et al. 2022

Chin. J. Chem.

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Comprehensive SummaryChlorinated conjugated polymers are rarely reported in ambipolar and n‐type organic thin‐film transistors (OTFTs), mainly due to the lack of chlorinated strong electron‐deficient building blocks. Herein, we report three new chlorine (Cl)‐ and cyano (CN)‐ substituted (E)‐1,2‐di(thiophen‐2‐yl)ethane building blocks and their copolymers P2Cl1CNTVT‐DPP, P4Cl1CNTVT‐DPP and P2Cl2CNTVT‐DPP. P2Cl1CNTVT‐DPP and P2Cl2CNTVT‐DPP had nearly planar backbone geometries, mixture of edge‐on and face‐on orientation and deeper energy levels, while P4Cl1CNTVT‐DPP had a twist backbone geometry, face‐on orientation and shallower energy levels. As a result, P2Cl1CNTVT‐DPP exhibited ambipolar characteristic with hole mobility (μh) of 0.70 cm2·V–1·s–1 and electron mobility (μe) of 0.84 cm2·V–1·s–1 and P2Cl2CNTVT‐DPP exhibited n‐type characteristic with μe of 0.64 cm2·V–1·s–1, while P4Cl1CNTVT‐DPP exhibited the lowest μe of 0.36 cm2·V–1·s–1. The devices based on P2Cl2CNTVT‐DPP exhibited good stability after being stored for 10 d in air. The results demonstrate that by rational molecular design, chlorinated polymers with low cost can be applied to high‐performance ambipolar and n‐type OTFTs.

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“…As an emerging material candidate for next‐generation light sensing, organic semiconductors can compensate well for the shortages of the traditional inorganic photodetectors for fabricating high‐performance NIR photodetectors, owing to their advantages of lightweight, low toxicity, solution processability, excellent mechanical flexibility, high energy gap tunability, capability of monolithic integration, etc . [ 15‐17 ] In addition, organic photodetectors can be operated at room temperature, avoiding the use of a cooling system. [ 18 ] With these attractive advantages, NIR organic photodetectors have demonstrated a wide range of applications including spectrum analyzers, [ 19 ] artificial retinal implants, [ 20 ] and spectroscopic image sensing, [ 21 ] as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†

Xiao

Shao

et al. 2023

Chin. J. Chem.

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Comprehensive Summary Near‐infrared organic photodiodes (NIR OPDs) have tremendous potential in industrial, military, and scientific applications, due to their unique features of lightweight, low toxicity, high structural flexibility, cooling‐system‐free, etc. However, the overall performance of currently available NIR OPDs still lags behind the commercial inorganic photodetectors, ascribed to the critical challenge of realizing organic semiconductors with sufficiently low optical bandgap and excellent optoelectronic properties simultaneously. Among various types of NIR‐absorbing organic semiconductors, polymethine dyes not only possess advantages of simple synthesis and structural diversity, but also show fascinating optical and aggregation features in the solid state, making them attractive material candidates for NIR OPDs. In this review, after a brief introduction of NIR OPDs and polymethine dyes, we comprehensively summarize the advances of polymethine dyes for broadband and narrowband NIR OPDs, and further introduce their applications in all‐organic optical upconversion devices and photoplethysmography sensors. In particular, the relationship between the chemical structure and the aggregation behaviors of polymethine dyes and the device performance is carefully discussed, providing some important molecular insights for developing high performance NIR OPDs.

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Small Molecule: Polymer Blends for N‐type Organic Thin Film Transistors via Bar‐coating in Air

Abstract: Fabricating n-type organic thin film transistors (OTFTs) based on small molecules via solution processing under atmospheric condi-Keywords Organic thin-film transistors | Thin films | Electron transport | Blend materials | Solvent effects 92 www.cjc.wiley-vch.de

Cited by 8 publications

References 36 publications

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Chlorinated Conjugated Polymer Based on Chlorine‐ and Cyano‐substituted (E)‐1,2‐Di(thiophen‐2‐yl)ethane for Ambipolar and n‐Type Organic Thin‐film Transistors

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†

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Small Molecule: Polymer Blends for N‐type Organic Thin Film Transistors via Bar‐coating in Air

Abstract: Fabricating n-type organic thin film transistors (OTFTs) based on small molecules via solution processing under atmospheric condi-Keywords Organic thin-film transistors | Thin films | Electron transport | Blend materials | Solvent effects 92 www.cjc.wiley-vch.de

Cited by 8 publications

References 36 publications

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Meniscus‐Guided Deposition of Organic Semiconductor Thin Films: Materials, Mechanism, and Application in Organic Field‐Effect Transistors

Chlorinated Conjugated Polymer Based on Chlorine‐ and Cyano‐substituted (E)‐1,2‐Di(thiophen‐2‐yl)ethane for Ambipolar and n‐Type Organic Thin‐film Transistors

Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes†

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Advances in Polymethine Dyes for Near‐Infrared Organic Photodiodes^†