Wafer-scale, layer-controlled organic single crystals for high-speed circuit operation

Yamamura, Akifumi; Watanabe, Shun; Uno, Mayumi; Mitani, Masato; Mitsui, Chikahiko; Tsurumi, Junto; Isahaya, Nobuaki; Kanaoka, Yusuke; Okamoto, Toshihiro

doi:10.1126/sciadv.aao5758

Cited by 248 publications

(414 citation statements)

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devices. [9,13] Compared to the growth of 1D organic crystals (e.g., wires, ribbons), growth of ultrathin 2DMCs requires suppression of "coffee-ring" effect during the process of solvent evaporation to ensure uniform molecule spreading. [9,13] Compared to the growth of 1D organic crystals (e.g., wires, ribbons), growth of ultrathin 2DMCs requires suppression of "coffee-ring" effect during the process of solvent evaporation to ensure uniform molecule spreading.

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confidence: 99%

“…As a result, a uniform distribution of molecules occurred on the water surface, thus forming micrometersized 2DMCs. Soluble acene derivative, 2,8-difluoro-5,11-bis(triethylsilylethynyl) anthradithiophene (Dif-TES-ADT) is used as a model system to demonstrate the feasibility and effectiveness of the method, which can also be extended to other small-molecule organic semiconductors including p-type 2,7-Didecyl[1]benzothieno [3,2b][1]benzothiopene (C 10 -BTBT) and n-type N, 4,9, ). A common feature of the ultrathin 2DMCs obtained in these strategies is that the crystallization occurs on the liquid surface.…”

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confidence: 99%

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Surficial Marangoni Flow‐Induced Growth of Ultrathin 2D Molecular Crystals on Target Substrates

Xiao

Fang

Deng

et al. 2019

Adv Materials Inter

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devices. [16] Besides, unlike inorganic 2D crystals, high-quality 2DMCs are easy to achieve through low-temperature solution-processed methods, like coating and printing. [9,13] Compared to the growth of 1D organic crystals (e.g., wires, ribbons), growth of ultrathin 2DMCs requires suppression of "coffee-ring" effect during the process of solvent evaporation to ensure uniform molecule spreading. [17][18][19][20][21][22][23] For example, Hu and coworkers demonstrated a strategy of introducing water as a growth surface to fabricate 2DMCs. [24] In this method, when the organic solution with low surface tension was dropped on the water (a high surface tension media), the solution would spontaneously and rapidly spread on the water surface by the local surface tension gradients, which is well known as a Marangoni effect. As a result, a uniform distribution of molecules occurred on the water surface, thus forming micrometersized 2DMCs. Li and coworkers further enhanced the spreading of the organic solution on the water by decreasing the interfacial surface tension between the water and organic solution, [25,26] and fewlayered or even monolayer 2DMCs were successfully obtained on the water surface. A common feature of the ultrathin 2DMCs obtained in these strategies is that the crystallization occurs on the liquid surface. Therefore, an additional transfer process to the target substrate is required for the subsequent device applications. Although various methods have been developed for efficient transfer of the 2DMCs, it remains a challenge to avoid damage or contamination of the 2DMCs during the transfer process. [24][25][26][27] Herein, we report a surficial Marangoni flow-induced selfassembly (SMFIS) method for the fabrication of 2DMCs directly on target substrates. This method involves two key stages for 2DMCs growth: i) confined crystallization field at a liquid/air interface produced by solvent-antisolvent mixture and ii) surficial Marangoni flow induced 2D crystal growth process. Soluble acene derivative, 2,8-difluoro-5,11-bis(triethylsilylethynyl) anthradithiophene (Dif-TES-ADT) is used as a model system to demonstrate the feasibility and effectiveness of the method, which can also be extended to other small-molecule organic semiconductors including p-type 2,7-Didecyl[1]benzothieno [3,2b][1]benzothiopene (C 10 -BTBT) and n-type N, 4,9, ). Millimeter-sized and ultrathin 2D Dif-TES-ADT crystals with step-and-terrace 2D molecular crystals (2DMCs) are emerging as excellent candidates for the application of organic field-effect transistors (OFETs), owing to their enhanced charge transport efficiency and long-range molecular ordering. However, many current methods involve an additional transfer process, which largely hinders the large-area fabrication of high-quality, intact 2DMCs for practical applications. Here, an efficient surficial Marangoni flow-induced self-assembly (SMFIS) method is developed for the fabrication of 2DMCs directly on target substrates without the need of a transfer process. This method utilize...

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confidence: 99%

mentioning

confidence: 99%

Surficial Marangoni Flow‐Induced Growth of Ultrathin 2D Molecular Crystals on Target Substrates

Xiao

Fang

Deng

et al. 2019

Adv Materials Inter

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“…Linear and saturation mobilities are found to be identical and show a clear plateau at high gate voltage (V G ) regime (see Supplementary Fig. 2), which is an indicative of coherent band-like transport 8,33,34 .…”

Section: Resultsmentioning

confidence: 84%

“…Their potential as an electronic element is recently rediscovered not only for their unique processability, but also for their excellent performance [1][2][3] . Particularly, an improvement of field-effect mobility of singlecrystalline organic semiconductors (up to 15 cm 2 V −1 s −1 ) allows for a large-scale production of high-density integrated circuits such as multi-bit logic circuits 4,5 , analog-to-digital (AD) converters 6,7 , radio-frequency identification (RF-ID) tags [8][9][10] .…”

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confidence: 99%

“…In striking contrast to such disordered organic compounds, solutionprocessed single crystals composed of organic molecules exhibit an excellent mobility of up to 15 cm 2 V −1 s −1 ref. [1][2][3]8 , which has motivated intensive research to explore not only the coherent (band-like) charge transport physics 27,28 , but also functionalities for next-generation (opto)electronic applications 29,30 . However, a subject under consideration still remains: how the charge carrier transport mechanism correlates to the 1/f noise, and to what extent the noise level can be reduced in a practical electronic circuit.…”

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confidence: 99%

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Remarkably low flicker noise in solution-processed organic single crystal transistors

et al. 2018

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Low-frequency noise generated by a fluctuation of current is a key issue for integrating electronic elements into a high-density circuit. Investigation of the noise in organic field-effect transistors is now sharing the spotlight with development of printed integrated circuits. The recent improvement of field-effect mobility (up to 15 cm 2 V −1 s −1 ) has allowed for organic integrated circuits with a relatively high-speed operation (~50 kHz). Therefore, an in-depth understanding of the noise feature will be indispensable to further improve the circuit stability and durability. Here we performed noise measurements in solution-processed organic single crystal transistors, and discovered that a low trap density-of-states due to the absence of structural disorder in combination with coherent band-like transport gives rise to an unprecedentedly low flicker noise. The excellent noise property in organic single crystals will allow their potential to be fully exploited for high-speed communication and sensing applications.

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Multilayer Integration for Organic Thin‐Film Transistors

Guo

Huang

Ouyang

et al. 2021

Digital Encyclopedia of Applied Physics

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The organic thin‐film transistor (OTFT) owns advantages of low processing temperature and excellent mechanical flexibility for creating truly flexible or stretchable electronics on arbitrate substrates. Beyond extensive research efforts in organic semiconductor (OSC) materials, stacking of the OSC and other layers for high performance OTFTs and circuit integration in a manufacturable way becomes vital. In this article, the advantages of OTFTs over inorganic counterparts are discussed in details. Then the suitable devices structures and multi‐layer material stacks for integration are introduced. The key processes for OSC deposition, device multi‐layer stacking, and especially OSC patterning are described. Finally, the circuit integration techniques, including not only the process for formation of via interconnection but also the circuit styles and integration architectures, are reviewed.

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Wafer-scale, layer-controlled organic single crystals for high-speed circuit operation

Abstract: A wafer-scale, 2D organic single-crystalline semiconductor revolutionizes near-field communication.

Cited by 248 publications

References 48 publications

Surficial Marangoni Flow‐Induced Growth of Ultrathin 2D Molecular Crystals on Target Substrates

Surficial Marangoni Flow‐Induced Growth of Ultrathin 2D Molecular Crystals on Target Substrates

Remarkably low flicker noise in solution-processed organic single crystal transistors

Multilayer Integration for Organic Thin‐Film Transistors

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