Precise, Self-Limited Epitaxy of Ultrathin Organic Semiconductors and Heterojunctions Tailored by van der Waals Interactions

Wu, Bing; Zhao, Yinghe; Nan, Haiyan; Yang, Ziyi; Zhang, Yuhan; Zhao, Huijuan; He, Daowei; Jiang, Zonglin; Liu, Xiaolong; Li, Yun; Shi, Yi; Ni, Zhenhua; Wang, Jinlan; Xu, Jianbin; Wang, Xinran

doi:10.1021/acs.nanolett.6b01108

Cited by 96 publications

(80 citation statements)

References 39 publications

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“…Figure 6d shows the calculated binding energy (BE) of a single C 8 -BTBT with different substrates, which depends highly on the underlying substrate. Such a BE gradient creates temperature windows for C 8 -BTBT thermodynamically stable on the corresponding substrates, resulting in self-limited organic molecule beam epitaxy (SLOMBE) [67]. Thus, highly precise, controllable, self-limited epitaxy of layered monocrystalline organic semiconductors (C 8 -BTBT) and related heterojunctions Figure 6e shows the AFM topography image of a heterojunction of bilayer (WL+1L) C 8 -BTBT/1L PTCDA/G, indicating the C 8 -BTBT was uniformly grown on PTCDA in a self-limited manner.…”

Section: C8-btbt On Layered Substratesmentioning

confidence: 99%

Van Der Waals Heterostructures between Small Organic Molecules and Layered Substrates

Huang

Wang

et al. 2016

Crystals

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Two dimensional atomic crystals, like grapheme (G) and molybdenum disulfide (MoS 2 ), exhibit great interest in electronic and optoelectronic applications. The excellent physical properties, such as transparency, semiconductivity, and flexibility, make them compatible with current organic electronics. Here, we review recent progress in the understanding of the interfaces of van der Waals (vdW) heterostructures between small organic molecules (pentacene, copper phthalocyanine (CuPc), perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA), and dioctylbenzothienobenzothiophene (C 8 -BTBT)) and layered substrates (G, MoS 2 and hexagonal boron nitride (h-BN)). The influences of the underlying layered substrates on the molecular arrangement, electronic and vibrational properties will be addressed.

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Section: C8-btbt On Layered Substratesmentioning

confidence: 99%

Van Der Waals Heterostructures between Small Organic Molecules and Layered Substrates

Huang

Wang

et al. 2016

Crystals

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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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“…One typical example is black phosphorus that supports anisotropic excitons with sensitive dependence on the sample thickness. Another interesting system is the layered molecular semiconductor, such as molecular layers of pentacene, and C 8 ‐BTBT . These organic vdW semiconductors support strongly bounded excitons that are sensitively dependent on the molecule orientations and interface interactions.…”

Section: Discussionmentioning

confidence: 99%

Recent Progress on Exciton Polaritons in Layered Transition‐Metal Dichalcogenides

Fei

2019

Advanced Optical Materials

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Exciton polaritons (EPs) are half‐light, half‐matter quasiparticles formed due to the coupling between photons and excitons in semiconductors. Their uniqueness lies at the strong light–matter interactions and long‐distance transport, thus promising for many novel applications in photonics, information, and quantum technologies. Recently, EPs in group‐VI transition‐metal dichalcogenides (TMDs) have attracted a lot of research interest due to their room‐temperature stability, long‐distance propagation, and controllability through electric gating, valley‐selective optical pumping, and precise thickness control. In this progress report, recent studies of EPs in TMDs are reviewed, highlighting their key properties and functionalities, and then discussing the potential directions for future research.

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Precise, Self-Limited Epitaxy of Ultrathin Organic Semiconductors and Heterojunctions Tailored by van der Waals Interactions

Cited by 96 publications

References 39 publications

Van Der Waals Heterostructures between Small Organic Molecules and Layered Substrates

Van Der Waals Heterostructures between Small Organic Molecules and Layered Substrates

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

Recent Progress on Exciton Polaritons in Layered Transition‐Metal Dichalcogenides

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