Unidirectional and crystalline organic semiconductor microwire arrays by solvent vapor annealing with PMMA as the assisting layer

Zhu, Xiaoting; Wang, Qingqing; Tian, Xinzi; Zhang, Xiaotao; Feng, Yiyu; Feng, Wei; Li, Rongjin; Hu, Wenping

doi:10.1039/c8tc04402c

Cited by 16 publications

(11 citation statements)

References 34 publications

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“…It also indicates that achieving highly uniform thin films with fewer grain boundaries and other defects is the key step to reach high‐performance devices . Further improving of the film quality could be achieved by optimizing the solvent selection, polymer blending ratio and concentration or applying post vapor annealing process . Both C 8 ‐BTBT and C 6 ‐DPA, which use rapid and simple screen printing, have similar transistor performance to their single‐crystal devices, which suggests the great potential of this method for real applications.…”

Section: Comparison Of the Electrical Characteristics Of Recently Repmentioning

confidence: 98%

Scalable Fabrication of Highly Crystalline Organic Semiconductor Thin Film by Channel‐Restricted Screen Printing toward the Low‐Cost Fabrication of High‐Performance Transistor Arrays

et al. 2019

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printing methods on various desirable substrates. Many soluble small-molecule organic semiconductors with high carrier mobility have been developed over the past decade, such as [1] benzothieno [3,2-b] benzothiophene (BTBT) derivatives. [11] The higher field-effect mobility of smallmolecule organic semiconductor (OSC) thin films is achieved with crystallization and crystal orientations, which are optimized for charge conduction. [12] Thus, state-of-the-art solution-processable OSCs have demonstrated excellent characteristics with better carrier mobility surpassing those of solution-processed metal oxides and amorphous silicon thin film transistors. [13,14] However, because of the vigorous crystallization of small-molecule organic semiconductors during the solvent evaporation, the polycrystalline domains with uncontrollable orientations and sizes are frequently developed, which results in a notably nonuniform film morphology. Hence, devices with high mobility and device-to-device uniformity are difficult to fabricate. Various solution based methods have been developed to control the thin film crystallization, [15] such as solution shearing, [16] inkjet printing, [17] slot-die coating, [18] spray printing, [19] and screen printing. [20] Among these methods, screen printing is considered a simple, efficient, and low-cost method to fabricate electronic devices in industry. The printing process for one layer consumes only few seconds, which is efficient for the mass production of organic electronics. Previous studies on screen-printed electronics mainly focused on the printing of conducting materials and inorganic semiconductors using high viscosity ink. [21,22] Thus, the thickness of the printed film often relies on the thickness of emulsion of the screen, which is commonly up to few micrometers. Obviously, screen printing is not suitable for depositing OSC thin films of OFET because of the huge contact resistance caused by the micrometer-scale film thickness. Although some works have fabricated screen-printed OFET devices based on polymer OSCs, [23] the device performance (mobility ≈ 0.03 cm 2 V −1 s −1 ) is inadequate for various applications. Therefore, the development of a simple and low-cost printing approach that can directly fabricate highly Control over the morphology and crystallinity of small-molecule organic semiconductor (OSC) films is of key importance to enable high-performance organic optoelectronic devices. However, such control remains particularly challenging for solution-processed OSC devices because of the complex crystallization kinetics of small-molecule OSC materials in the dynamic flow of inks. Here, a simple yet effective channel-restricted screen-printing method is reported, which uses small-molecule OSCs/insulating polymer to yield largegrained small-molecule OSC thin-film arrays with good crystallization and preferred orientation. The use of cross-linked organic polymer banks produces a confinement effect to trigger the outward convective flow at two sides of the channel by the fast solv...

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Section: Comparison Of the Electrical Characteristics Of Recently Repmentioning

confidence: 98%

Scalable Fabrication of Highly Crystalline Organic Semiconductor Thin Film by Channel‐Restricted Screen Printing toward the Low‐Cost Fabrication of High‐Performance Transistor Arrays

et al. 2019

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“…In this structure, the sum of the widths of the ribbons between the channels was used as the channel width ( Fig. S2) [46]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Continuous and highly ordered organic semiconductor thin films via dip-coating: the critical role of meniscus angle

Liu

Zhang

et al. 2020

Sci. China Mater.

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Dip-coating is a low-cost, high-throughput technique for the deposition of organic semiconductors over large area on various substrates. Tremendous studies have been done and many parameters such as withdrawal speed, solvent type and solution concentration have been investigated. However, most of the depositions were ribbons or dendritic crystals with low coverage of the substrate due to the ignorance of the critical role of dynamic solution-substrate interactions during dip-coating. In this study, meniscus angle (MA) was proposed to quantify the real-time in-situ solutionsubstrate interactions during dip-coating. By proper surface treatment of the substrate, the value of MA can be tuned and centimeter-sized, continuous and highly ordered organic semiconductor thin films were achieved. The charge transport properties of the continuous thin films were investigated by the construction of organic field-effect transistors. Maximum (average) hole mobility up to 11.9(5.1) cm 2 V −1 s −1 was obtained. The average mobility was 82% higher than that of ribbon crystals, indicating the high crystallinity of the thin films. Our work reveals the critical role of dynamic solutionsubstrate interactions during dip-coating. The ability to produce large-area, continuous and highly ordered organic semiconductor thin films by dip-coating could revival the old technique for the application in various optoelectronics.

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“…PMMA has extensive applications such as in optics, polymer viscosity and biomedical engineering, and also finds important implementation in nanotechnologies because of its easy processing and good compatibility with inorganic materials such as carbon nanotubes [199]. As one of the most studied polymers for blending with organic semiconductors, PMMA demonstrates exceptional capability for enhancing the semiconductor growth [200], film crystallinity [201], grain size [202], phase segregation [203],…”

Section: Poly(methyl Methacrylate) With Varying Molecular Weightmentioning

confidence: 99%

Tailoring the molecular weight of polymer additives for organic semiconductors

Zhang

2022

Mater. Adv.

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Unidirectional and crystalline organic semiconductor microwire arrays by solvent vapor annealing with PMMA as the assisting layer

Abstract: Unidirectional and crystalline organic semiconductor microwire arrays were obtained by solvent vapor annealing with PMMA as the assisting layer.

Cited by 16 publications

References 34 publications

Scalable Fabrication of Highly Crystalline Organic Semiconductor Thin Film by Channel‐Restricted Screen Printing toward the Low‐Cost Fabrication of High‐Performance Transistor Arrays

Scalable Fabrication of Highly Crystalline Organic Semiconductor Thin Film by Channel‐Restricted Screen Printing toward the Low‐Cost Fabrication of High‐Performance Transistor Arrays

Continuous and highly ordered organic semiconductor thin films via dip-coating: the critical role of meniscus angle

Tailoring the molecular weight of polymer additives for organic semiconductors

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