Solution‐Processed Monolayer Organic Crystals for High‐Performance Field‐Effect Transistors and Ultrasensitive Gas Sensors

Peng, Boyu; Huang, Sheng-Lung; Zhou, Zhiwen; Chan, Paddy K. L.

doi:10.1002/adfm.201700999

Cited by 186 publications

(197 citation statements)

References 41 publications

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“…A representative example is given by the work of Torsi et al who have L‐phenylalanine‐modified organic semiconductors to selectively probe optical isomers . Engineering of dielectric layer and of device architecture, as well as integration of sensors arrays are actively pursued to increase figures of merit to meet requirements of specific analyte detection . Some OFETs are even able to sense ions in marine environment .…”

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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Section: Charge Transportmentioning

confidence: 99%

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

et al. 2020

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“…[1][2][3][4][5][6][7][8][9][10][11] The molecular crystals feature an ultrathin 2D structure, representing ultimate scalability in their thickness direction, such as scaling down to the monolayer (ML) or few layers of molecules. [1][2][3][4][5][6][7][8][9][10][11] The molecular crystals feature an ultrathin 2D structure, representing ultimate scalability in their thickness direction, such as scaling down to the monolayer (ML) or few layers of molecules.…”

Section: Introductionmentioning

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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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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“…As depicted in Figure c,d, the ultrathin HTEB‐based OFET sensor showed excellent sensitivity, high selectivity, and reversibility to NH 3 gas, with a LOD of 100 ppb. In another work, Chan and his co‐workers developed a dual solution‐shearing method to generate large‐area, highly crystallized, and continuous semiconductors monolayers of 2,9‐didecyldinaphtho [2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (C 10 ‐DNTT) in millimeter scale . The growth of crystallized semiconductor monolayer includes process of dissolving and recrystallization (Figure e).…”

Section: And Ultrathin Osc Filmsmentioning

confidence: 99%

“…Inset: Height profile along white dotted line; g) response of monolayer‐based (red) and multilayer‐based (black) OFET sensors upon exposure to different concentrations of NH 3 gas. Reproduced with permission . Copyright 2017, Wiley‐VCH.…”

Section: And Ultrathin Osc Filmsmentioning

confidence: 99%

“…In another work, Chan and his co-workers developed a dual solutionshearing method to generate large-area, highly crystallized, and continuous semiconductors monolayers of 2,9-didecyldinaphtho [2,3-b:2′,3′-f ]thieno[3,2-b]thiophene (C 10 -DNTT) in millimeter scale. [40] The growth of crystallized semiconductor monolayer includes process of dissolving and recrystallization ( Figure 4e). As shown in Figure 4f, the high-quality 4 nm monolayer film of C 10 -DNTT was achieved by controlling the concentration of semiconductor in the solvent, substrate deposition temperature, and shearing speed during the process of the two steps of solution shearing.…”

Section: And Ultrathin Osc Filmsmentioning

confidence: 99%

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Gas Sensors Based on Nano/Microstructured Organic Field‐Effect Transistors

Zhang

Zhao

et al. 2019

Small

107

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Benefiting from the advantages of organic field‐effect transistors (OFETs), including synthetic versatility of organic molecular design and environmental sensitivity, gas sensors based on OFETs have drawn much attention in recent years. Potential applications focus on the detection of specific gas species such as explosive, toxic gases, or volatile organic compounds (VOCs) that play vital roles in environmental monitoring, industrial manufacturing, smart health care, food security, and national defense. To achieve high sensitivity, selectivity, and ambient stability with rapid response and recovery speed, the regulation and adjustment of the nano/microstructure of the organic semiconductor (OSC) layer has proven to be an effective strategy. Here, the progress of OFET gas sensors with nano/microstructure is selectively presented. Devices based on OSC films one dimensional (1D) single crystal nanowires, nanorods, and nanofibers are introduced. Then, devices based on two dimensional (2D) and ultrathin OSC films, fabricated by methods such as thermal evaporation, dip‐coating, spin‐coating, and solution‐shearing methods are presented, followed by an introduction of porous OFET sensors. Additionally, the applications of nanostructured receptors in OFET sensors are given. Finally, an outlook in view of the current research state is presented and eight further challenges for gas sensors based on OFETs are suggested.

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Solution‐Processed Monolayer Organic Crystals for High‐Performance Field‐Effect Transistors and Ultrasensitive Gas Sensors

Cited by 186 publications

References 41 publications

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

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

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

Gas Sensors Based on Nano/Microstructured Organic Field‐Effect Transistors

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