Improvement of the Performance of Printed Organic Thin Film Transistor by Calendering Process

Hoon, Lee Sang; Duc, Nguyen Ho Anh; Jaemin, Kim; Ko, Sung-Lim; Lee, Sangyoon

doi:10.1166/sam.2016.2495

Cited by 9 publications

(10 citation statements)

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“…The key factors that determine the printability of the layers, including the line per inch (LPI) of the engraved cylinder, the printing speed, the curing condition, and the appropriate viscosity of the magnetic ink, were optimized by repeated experiments. 15,[17][18][19][20][21][22][23][24][25][26] The patterns were engraved on a nickel-copper-plated cylinder. The printability and thickness of a printed layer strongly depend on the LPI of the engraved cylinder, the printing speed, the viscosity of the ink, and the curing conditions.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The printing speed and the drying condition of the sacrificial layer were adapted from our previous research. 17,22,23,25) Thickness and surface roughness (Ra) of five different magnetic polymer layers that were roll-to-roll gravure printed with optimized LPI and printing speed were measured using an interferometer. The average thickness was 7 μm [Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Fabrication of a magnetic thin-film actuator using roll-to-roll gravure printing

Nguyen¹,

Lee²,

Shin³

et al. 2023

Jpn. J. Appl. Phys.

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Magnetic actuators are attractive for their capabilities of fast-response, large-deformation, and low-power-requirement compared to other types of actuators. The roll-to-roll printing is a continuous process with highest productivity. Here, we fabricated the cantilever-structured magnetic actuators using the roll-to-roll gravure printing process. By integrating an in-situ magnetization (ISM) process into the roll-to-roll printing process, the vector of the magnetic layer was programmed instantly during printing. This technique improved productivity and decreased materials waste. The fabrication process for the actuator includes printing the sacrificial layer, printing and magnetizing the magnetic layer, and coating the structural layer. An air gap between the substrate and cantilever beam of the actuator was made by removing the sacrificial layer. The actuator samples were examined in terms of displacement, hysteresis, and durability. Our actuators can rotate up to 90 ° and can be actuated at 20 Hz under a magnetic field of 80 mT.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Fabrication of a magnetic thin-film actuator using roll-to-roll gravure printing

Nguyen¹,

Lee²,

Shin³

et al. 2023

Jpn. J. Appl. Phys.

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“…Printed electronics technology has been developed to fabricate flexible electronic devices by printing functional ink using conventional printing methods, − which include gravure printing, , offset printing, and flexography . In addition, coating methods, such as slot-die coating − and spin-coating, , are also used.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Roll-to-Roll-Coated Cantilever-Structured Touch Sensors

Lee

2020

ACS Appl. Mater. Interfaces

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It is common in the field of printed electronics that polydimethylsiloxane (PDMS) be used as a dielectric layer for capacitive sensors because of its high elasticity and restoration force. However, capacitive sensors with the PDMS dielectric layer have a lower sensitivity than those with an air-gap structure that has been fabricated by the conventional micro-electromechanical system (MEMS) process. This paper presents a productive method for fabricating air-gap structures for touch sensors by roll-to-roll slot-die coating. The air-gap is formed by coating and removing a sacrificial layer. Cantilever-structured capacitive touch sensors with an air-gap are fabricated as follows: First, the bottom electrode, the dielectric layer, and the poly(vinyl alcohol) (PVA) sacrificial layer are roll-to-roll slot-die-coated on a flexible substrate. In addition, the spacer layer is spin-coated. On the sacrificial and spacer layers, the top electrode and structural layer are formed by spin-coating. Then, the air-gap and cantilever structure are made by removing the sacrificial layer in water. The cantilever-structured sensor samples are examined in terms of sensitivity, hysteresis, and repeatability. In particular, the electrical performance of the samples is compared to those with the PDMS dielectric layer. Experimental results show that the cantilever-structured sensor samples have significantly higher sensitivity compared to those with the PDMS dielectric layer.

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“…Printed electronics [28][29][30][31][32][33][34] is considered a promising alternative technology to MEMS because of its advantages in productivity, cost, and suitability for fabricating flexible electronic devices. Numerous printing methods such as gravure [35][36][37][38], offset [39][40][41] and flexograpy [42][43][44] are used.…”

Section: Introductionmentioning

confidence: 99%

Cantilever Type Acceleration Sensors Made by Roll-to-Roll Slot-Die Coating

Lee

2020

Sensors

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This paper presents the fabrication by means of roll-to-roll slot-die coating and characterization of air gap-based cantilever type capacitive acceleration sensors. As the mass of the sensor moves in the opposite direction of the acceleration, a capacitance change occurs. The sensor is designed to have a six layers structure with an air gap. Fabrication of the air gap and cantilever was enabled by coating and removing water-soluble PVA. The bottom electrode, the dielectric layer, and the sacrificial layer were formed using the roll-to-roll slot-die coating technique. The spacer, the top electrode, and the structural layer were formed by spin coating. Several kinds of experiments were conducted for characterization of the fabricated sensor samples. Experimental results show that accelerations of up to 3.6 g can be sensed with an average sensitivity of 0.00856 %/g.

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Improvement of the Performance of Printed Organic Thin Film Transistor by Calendering Process

Cited by 9 publications

References 0 publications

Fabrication of a magnetic thin-film actuator using roll-to-roll gravure printing

Fabrication of a magnetic thin-film actuator using roll-to-roll gravure printing

Fabrication and Characterization of Roll-to-Roll-Coated Cantilever-Structured Touch Sensors

Cantilever Type Acceleration Sensors Made by Roll-to-Roll Slot-Die Coating

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