Bottom-up growth of n-type monolayer molecular crystals on polymeric substrate for optoelectronic device applications

Shi, Yanjun; Jiang, Lang; Liu, Jie; Tu, Zeyi; Hu, Yuanyuan; Wu, Qinghe; Yi, Yuanping; Gann, Eliot; McNeill, Christopher R.; Li, Hongxiang; Hu, Wenping; Zhu, Daoben; Sirringhaus, Henning

doi:10.1038/s41467-018-05390-3

Cited by 126 publications

(151 citation statements)

References 40 publications

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“…Based on bilayer single crystalline films, OFET exhibited maximum mobility up to 13 cm 2 V −1 s −1 , demonstrating the intriguing potential of 2D molecular crystals . Furthermore, a centimeter‐scale n‐type monolayer small‐molecule crystal has already been manufactured with a high electron mobility of 1.24 cm 2 V −1 s −1 …”

Section: Optimization Of Nonideal Ofetsmentioning

confidence: 98%

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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Section: Optimization Of Nonideal Ofetsmentioning

confidence: 98%

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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“…[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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“…Considerable efforts have been made to realize high‐performance organic‐monolayer transistors from small molecules. For instance, field‐effect mobilites of pentacene, 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene (C8‐BTBT), dicyanomethylene‐substituted fused tetrathienoquinoid, and 1,4‐bis((5′‐hexyl‐2,2′‐bithiophen‐5‐yl)ethynyl)benzene have reached values on the order of 1–10 cm 2 V −1 s −1 in monolayer transistors. In sharp contrast, monolayer transistors based on conjugated polymers generally exhibit mobilities that are orders of magnitude lower than their small‐molecule counterparts, apart from few exceptions, largely due to their lower crystallinity and associated challenges in controlling the morphology of the monolayer.…”

Section: Introductionmentioning

confidence: 99%

Controlling the Microstructure of Conjugated Polymers in High‐Mobility Monolayer Transistors via the Dissolution Temperature

Bin

Jiao

et al. 2019

Angewandte Chemie

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It remains a challenge to precisely tailor the morphology of polymer monolayers to control charge transport. Herein, the effect of the dissolution temperature (Tdis) is investigated as a powerful strategy for morphology control. Low Tdis values cause extended polymer aggregation in solution and induce larger nanofibrils in a monolayer network with more pronounced π–π stacking. The field‐effect mobility of the corresponding monolayer transistors is significantly enhanced by a factor of four compared to devices obtained from high Tdis with a value approaching 1 cm2 V−1 s−1. Besides that, the solution kinetics reveal a higher growth rate of aggregates at low Tdis, and filtration experiments further confirm that the dependence of the fibril width in monolayers on Tdis is consistent with the aggregate size in solution. The generalizability of the Tdis effect on polymer aggregation is demonstrated using three other conjugated polymer systems. These results open new avenues for the precise control of polymer aggregation for high‐mobility monolayer transistors.

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Bottom-up growth of n-type monolayer molecular crystals on polymeric substrate for optoelectronic device applications

Cited by 126 publications

References 40 publications

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

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

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

Controlling the Microstructure of Conjugated Polymers in High‐Mobility Monolayer Transistors via the Dissolution Temperature

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