Solvent‐Free Directed Patterning of a Highly Ordered Liquid Crystalline Organic Semiconductor via Template‐Assisted Self‐Assembly for Organic Transistors

Kim, Aryeon; Jang, Kwang Suk; Won, Jong Chan; Yi, Mi Hye; Kim, Hanim; Yoon, Dong Ki; Shin, Tae Joo; Lee, Myong Hoon; Ka, Jae Won; Kim, Yun Ho

doi:10.1002/adma.201302719

Cited by 77 publications

(44 citation statements)

References 37 publications

(64 reference statements)

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“…It was reported that 2,7-didecyl [1]benzothieno [3,2-b] [1] benzothiophene (C 10 -BTBT) TFTs with an alumina/polyimide gate insulator exhibited a field-effect mobility of 1.42 cm 2 /V s and an on/off current ratio of $10 6 [14]. Quasi single-crystalline C 10 -BTBT TFTs with alkyl chain-grafted polyimide gate insulators exhibited a field-effect mobility of 1.74 cm 2 /V s and an on/off current ratio of $10 5 [15]. Remarkably, organic TFTs with polyimide gate insulators showed excellent device performances.…”

Section: Introductionmentioning

confidence: 98%

“…A variety of organic semiconductors for high-performance TFTs have been reported, while the development of organic gate insulators has been more limited. Recently, we reported the fabrication of polyimide gate insulators for high-performance organic TFTs [11][12][13][14][15]. Polyimide thin films have excellent electrical insulating properties.…”

Section: Introductionmentioning

confidence: 99%

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Polyimide/polyvinyl alcohol bilayer gate insulator for low-voltage organic thin-film transistors

Yoo

Kim

et al. 2015

Organic Electronics

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Polyimide/polyvinyl alcohol bilayer gate insulator for low-voltage organic thin-film transistors

Yoo

Kim

et al. 2015

Organic Electronics

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“…UCL-001 exhibits liquid crystal phase (N phase) in the temperature range from 41 o C to the room temperature. The organic semiconductor material was C8-BTBT (Sigma-Aldrich) [7], which exhibits liquid crystal phase (SmA phase) in the temperature range from 123.7 to 103. …”

Section: Methodsmentioning

confidence: 99%

Basic Study on Photocurable Liquid Crystal / C8-BTBT Mixtures for High-Mobility Organic Semiconductors

Sasaki

Shoji

Noguchi

et al. 2016

J. Photopol. Sci. Technol.

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Recently, organic semiconductors have been attracting extensive interests such as an active layer for thin film transistors. The electric conduction in organic semiconductor is governed by hopping conduction because of crystallographic directions with especially weak -electronic interactions. Therefore, the mobility is improved as the molecular orientation is improved. We have tried to obtain the uniform molecular orientation of photocurable mesogenic monomers and solidify the orientational structure by irradiation of UV light. Furthermore, we have examined the charge carrier transport properties of the solidified samples and researched the influence of the molecular orientation on the carrier transport. As a result, the textures observed at 55 and 30 o C before the photocure, show non-uniform structures. It is guessed that the compatibility of UCL-001 with C8-BTBT is low, and then, the mixture of UCL-001 and C8-BTBT were phase-separated. On the other hand, in the polymer concentration of 75 wt%, the isotropic phase structure can be solidified by photocuring at 100 o C. In the charge carrier transport properties, the hole mobility of the solidified samples cannot be determined. However, from the viewpoint of the quantity of photocurrent, the sample photocured at 55 o C shows the most quantity of photocurrent. It is confirmed that the charge carrier transport properties depend on the molecular orientation, and in order to obtain the high mobility, the uniform orientation is important.

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“…First, the device yield and reproducibility could be effectively improved based on the highly aligned organic crystal arrays. Second, crosstalk among devices as well as fluctuation of device performance could be remarkably reduced with the use of precisely patterned organic crystals . In the light of this, an efficient method is much desired to produce precisely patterned organic p–n heterojunction micro/nanocrystal arrays for high‐performance ambipolar OFETs.…”

Section: Surface Energies Of Photoresist (Su‐8) and Dif‐tes‐adt Determentioning

confidence: 99%

Precise Patterning of Laterally Stacked Organic Microbelt Heterojunction Arrays by Surface‐Energy‐Controlled Stepwise Crystallization for Ambipolar Organic Field‐Effect Transistors

et al. 2018

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Ambipolar organic field-effect transistors (OFETs) combining single-crystalline p- and n-type organic micro/nanocrystals have demonstrated superior performance to their amorphous or polycrystalline thin-film counterparts. However, large-area alignment and precise patterning of organic micro/nanocrystals for ambipolar OFETs remain challenges. Here, a surface-energy-controlled stepwise crystallization (SECSC) method is reported for large-scale, aligned, and precise patterning of single-crystalline laterally stacked p-n heterojunction microbelt (MB) arrays. In this method, the p- and n-type organic crystals are precipitated via a stepwise process: first, the lateral sides of prepatterned photoresist stripes provide high-surface-energy sites to guide the aligned growth of p-type organic crystals. Next, the formed p-type crystals serve as new high-surface-energy positions to induce the crystallization of n-type organic molecules at their sides, thus leading to the formation of laterally stacked p-n microbelts. Ambipolar OFETs based on the p-n heterojunction MB arrays exhibit balanced hole and electron mobilities of 0.32 and 0.43 cm V s , respectively, enabling the fabrication of complementary-like inverters with large voltage gains. This work paves the way toward rational design and construction of single-crystalline organic p-n heterojunction arrays for high-performance organic, integrated circuits.

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Solvent‐Free Directed Patterning of a Highly Ordered Liquid Crystalline Organic Semiconductor via Template‐Assisted Self‐Assembly for Organic Transistors

Cited by 77 publications

References 37 publications

Polyimide/polyvinyl alcohol bilayer gate insulator for low-voltage organic thin-film transistors

Polyimide/polyvinyl alcohol bilayer gate insulator for low-voltage organic thin-film transistors

Basic Study on Photocurable Liquid Crystal / C8-BTBT Mixtures for High-Mobility Organic Semiconductors

Precise Patterning of Laterally Stacked Organic Microbelt Heterojunction Arrays by Surface‐Energy‐Controlled Stepwise Crystallization for Ambipolar Organic Field‐Effect Transistors

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