High-Mobility, Ultrathin Organic Semiconducting Films Realized by Surface-Mediated Crystallization

Vladimirov, Ilja; Kellermeier, Matthias; Geßner, Thomas; Molla, Zarah; Grigorian, Souren; Pietsch, U.; Schaffroth, Lilian S.; Kühn, Michael; May, Falk; Weitz, R. Thomas

doi:10.1021/acs.nanolett.7b03789

Cited by 68 publications

(86 citation statements)

References 21 publications

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“…Zhang et al observed a better molecular packaging in the poly(diketopyrrolopyrrole‐thiophene‐thieno[3,2,b]thiophene‐thiophene) (DPP2T‐TTT) thin film when the system surface energy decreased . Similar results of surface energy regulation have been perceived by Vladimirov et al They observed n‐type crystals could start to grow at the solvent–air interface if the surface energy of solvents was higher than that of crystals . Other than the experimental parameters, physical modeling has also been employed to investigate the crystallization process of the thin films.…”

Section: Introductionmentioning

confidence: 71%

Understanding the Meniscus‐Guided Coating Parameters in Organic Field‐Effect‐Transistor Fabrications

Chen

Peng

Huang

et al. 2019

Adv Funct Materials

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Meniscus-guided coating (MGC) is mainly applicable on the soluble organic semiconductors with strong π-π overlap for achieving single-crystalline organic thin films and high-performance organic field-effect-transistors (OFETs). In this work, four elementary factors including shearing speed (v), solute concentration (c), deposition temperature (T), and solvent boiling point (T b ) are unified to analyze crystal growth behavior in the meniscus-guided coating. By carefully varying and studying these four key factors, it is confirmed that v is the thickness regulation factor, while c is proportional to crystal growth rate. The MGC crystal growth rate is also correlated to latent heat (L) of solvents and deposition temperature in an Arrhenius form. The latent heat of solvents is proportional to T b . The OFET channels grown by the optimized MGC parameters show uniform crystal morphology (Roughness R q < 0.25 nm) with decent carrier mobilities (average µ = 5.88 cm 2 V −1 s −1 and highest µ = 7.68 cm 2 V −1 s −1 ). The studies provide a generalized formula to estimate the effects of these fabrication parameters, which can serve as crystal growth guidelines for the MGC approach. It is also an important cornerstone towards scaling up the OFETs for the sophisticated organic circuits or mass production.

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Section: Introductionmentioning

confidence: 71%

Understanding the Meniscus‐Guided Coating Parameters in Organic Field‐Effect‐Transistor Fabrications

Chen

Peng

Huang

et al. 2019

Adv Funct Materials

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“…Although chirality is textbook concept in synthetic chemistry, few chiral organic semiconductors have been reported so far, in contrast of chiral conjugated polymers and chiral organic conductors that have received more attention . There are essentially two types of molecular structures, either the π‐systems are chiral and depart from planarity or chiral side‐groups are attached to a flat conjugated core . Figure presents a selection of some chiral semiconductors.…”

Section: Charge Transportmentioning

confidence: 99%

Molecular Semiconductors for Logic Operations: Dead‐End or Bright Future?

et al. 2020

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The field of organic electronics has been prolific in the last couple of years, leading to the design and synthesis of several molecular semiconductors presenting a mobility in excess of 10 cm2 V−1 s−1. However, it is also started to recently falter, as a result of doubtful mobility extractions and reduced industrial interest. This critical review addresses the community of chemists and materials scientists to share with it a critical analysis of the best performing molecular semiconductors and of the inherent charge transport physics that takes place in them. The goal is to inspire chemists and materials scientists and to give them hope that the field of molecular semiconductors for logic operations is not engaged into a dead end. To the contrary, it offers plenty of research opportunities in materials chemistry.

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“…Guiding Monolayer Formation with Uniform Microstructures : Driven by the attractive properties of 2D materials such as planar surface, ultrahigh carrier mobility, and sensitivity, considerable attention has been focused on the organic monolayer and few‐layer transistors for novel multifunctional optoelectronics, However, it is not facile to fabricate a few‐layer structure for organic materials because of weak π–π interactions. The resulting films often consist of polycrystalline phases rather than continuous single‐crystalline phases …”

Section: Optimization Of Nonideal Ofetsmentioning

confidence: 99%

Understanding, Optimizing, and Utilizing Nonideal Transistors Based on Organic or Organic Hybrid Semiconductors

Yang

Dai

et al. 2019

Adv Funct Materials

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Many advanced materials have been developed for organic field-effect transistors (OFETs) or thin-film transistors (TFTs) based on organic and organic hybrid materials. However, although many new OFETs exhibit superior characteristic parameters (such as high mobility), most of them show nonideal performances that have strongly limited progress in the design of molecules, the understanding of transport mechanisms, and the circuit applications of OFETs. In this review, the device physics of ideal and nonideal OFETs is discussed first to understand the factors that limit effective mobility in semiconducting channels, distort the potential distribution, or reduce the drift electric field. Then, recent advances in optimizing the material combinations, device structures, and fabrications of OFETs toward ideal transistors are discussed. Based on the good control of materials and interfaces, some new and novel concepts to utilize the nonideal properties of OFETs to build low-power circuits and integrated sensors are also discussed.

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High-Mobility, Ultrathin Organic Semiconducting Films Realized by Surface-Mediated Crystallization

Cited by 68 publications

References 21 publications

Understanding the Meniscus‐Guided Coating Parameters in Organic Field‐Effect‐Transistor Fabrications

Understanding the Meniscus‐Guided Coating Parameters in Organic Field‐Effect‐Transistor Fabrications

Molecular Semiconductors for Logic Operations: Dead‐End or Bright Future?

Understanding, Optimizing, and Utilizing Nonideal Transistors Based on Organic or Organic Hybrid Semiconductors

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