Fast growth of monolayer organic 2D crystals and their application in organic transistors

Wang, Zhifang; Niu, Xiaofei; Zhou, Xu; Song, Ruxin; Wang, Zi; Huang, Lizhen; Chi, Lifeng

doi:10.1016/j.orgel.2018.03.038

Cited by 15 publications

(20 citation statements)

References 51 publications

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“…The weak intermolecular interactions of OSCs present difficulties for their controlled and efficient assembly, which may lead to poor repeatability and reliability of the optoelectronic performance . Dip-coating has an intrinsic three-phase contact line (TPCL) that can easily modulate the assembly kinetics, , providing an optimal platform for the low-dimensional growth of OSCs. Until now, many ultrathin OSC films/microstructures have been realized with both small molecules and polymer semiconductors, ,,,,− as presented in Figure .…”

Section: Basic Assembly Kinetics Processmentioning

confidence: 99%

Microstructured Ultrathin Organic Semiconductor Film via Dip-Coating: Precise Assembly and Diverse Applications

Wang

Huang

et al. 2020

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Organic semiconductors (OSCs) have led to considerable progress in various fields owing to their intrinsic flexibility, adjustable chemical structures, multifunctionalities, and low processing cost. The optoelectronic properties of OSCs greatly depend on their aggregation state in molecular assemblies. To obtain ideal and reliable optoelectronic performances, a highly controlled assembly method for modulating OSC packing structures is indispensable. In particular, ultrathin OSC microstructures consisting of one to several molecular layers, known as microstructured ultrathin organic semiconductor films (MUOSFs), are of great importance for both fundamental research and applications of OSCs. However, most reported film thicknesses or molecular layer numbers of ultrathin OSC films/ microstructures are "average values" rather than "real values" and are not molecularly precise. The lack of an effective and general assembly strategy seriously hinders the progress of MUOSFs. In this Account, we summarize our recent progress in exploring the assembly strategy, the underlying mechanism, and diverse applications of MUOSFs prepared via dipcoating under optimized conditions. Dip-coating, with an intrinsic three-phase contact line, has a great advantage to precisely assemble ultrathin OSC films/ microstructures. As an evaporation-controlled method, the assembly processes used in dip-coating are susceptible to multiple factors, such as pulling speed, molecular structures, and solution properties. Under the guidance of our proposed "Balance Principle" for adjusting these factors, uniform and continuous MUOSFs can be obtained over a large area. Under optimized conditions, the number of molecular layers of MUOSFs can be customized with monolayer precision, which is significant for investigating the charge transport mechanism of OSCs. At the same time, the ultrathin and partial coverage characteristics of MUOSFs are beneficial to fabricate flexible and transparent devices for wearable electronics. Notably, the morphologies and coverage of ultrathin microstripes can be well tuned by the pulling speed, which is highly desired for high-performance bio/chemical sensors, because the large specific surface area provides abundant reactive sites.The feasibility and generality of our assembly method demonstrate that dip-coated MUOSFs have excellent advantages for fundamental research and applications of OSC materials, based on which many promising future works around MUOSFs can be extended to more related fields by engineering molecular orientations, packing structures, film morphologies, coverage, etc. The work on the assembly and applications of MUOSFs might offer the potential to promote the progress of organic electronics.

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Section: Basic Assembly Kinetics Processmentioning

confidence: 99%

Microstructured Ultrathin Organic Semiconductor Film via Dip-Coating: Precise Assembly and Diverse Applications

Wang

Huang

et al. 2020

Acc. Mater. Res.

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“…Besides, monolayer crystals of an insulating material (C 44 H 90 ) with tunable size from tens to hundreds of micrometers were successfully synthesized using the dip-coating method, which can enhance the OFET performance of polycrystalline pentacene films deposited atop [93].…”

Section: Other Amorphous and Polycrystalline Monolayer Ofetsmentioning

confidence: 99%

Monolayer organic field-effect transistors

Liu

Jiang

Hu³

et al. 2019

Sci. China Chem.

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Monolayer organic field-effect transistors (OFETs) are attracting worldwide interest in device physics and novel applications due to their ultrathin active layer for two-dimensional charge transport. The monolayer films are generally prepared by thermal evaporation, the Langmuir technique or self-assembly process, etc., but their electrical performance is relatively lower than corresponding thick films. From 2011, the performance of monolayer OFETs has been boosted by using the monolayer molecular crystals (MMCs) as active channels, which opened up a new era for monolayer OFETs. In this review, recent progress of monolayer OFETs, including the preparation of monolayer films, their OFET performance and applications are summarized. Finally, perspectives of monolayer OFETs in the near future are also discussed.

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“…2D organic crystals (2D OCs) with adjustable layer numbers have significant advantages over thicker bulk organic materials in research of the aforementioned fundamental challenges. Several layers or perhaps a monolayer of organic molecules are bound by weak van der Waals forces in the microstructures of 2D OCs [28]. Because there are no known 'lattice mismatch' difficulties, it is easy to build a vertical heterostructure using multiple 2D layered materials [29,30].…”

Section: Introductionmentioning

confidence: 99%

Evolutionary 2D organic crystals for optoelectronic transistors and neuromorphic computing

Qian¹,

Bu²,

Wang³

et al. 2022

Neuromorph. Comput. Eng.

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Brain-inspired neuromorphic computing has been extensively researched, taking advantage of increased computer power, the acquisition of massive data, and algorithm optimization. Neuromorphic computing requires mimicking synaptic plasticity and enables near-in-sensor computing. In synaptic transistors, how to elaborate and examine the link between microstructure and characteristics is a major difficulty. Due to the absence of interlayer shielding effects, defect-free interfaces, and wide spectrum responses, reducing the thickness of organic crystals to the 2D limit has a lot of application possibilities in this computing paradigm. This paper presents an update on the progress of 2D organic crystal-based transistors for data storage and neuromorphic computing. The promises and synthesis methodologies of 2D organic crystals are summarized. Following that, applications of 2D organic crystals for ferroelectric nonvolatile memory, circuit-type optoelectronic synapses, and neuromorphic computing are addressed. Finally, new insights and challenges for the field's future prospects are presented, pushing the boundaries of neuromorphic computing even farther.

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Fast growth of monolayer organic 2D crystals and their application in organic transistors

Cited by 15 publications

References 51 publications

Microstructured Ultrathin Organic Semiconductor Film via Dip-Coating: Precise Assembly and Diverse Applications

Microstructured Ultrathin Organic Semiconductor Film via Dip-Coating: Precise Assembly and Diverse Applications

Monolayer organic field-effect transistors

Evolutionary 2D organic crystals for optoelectronic transistors and neuromorphic computing

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