Flexography Printing for Organic Thin Film Transistors

Cosnahan, Thomas; Watt, Andrew A. R.; Assender, Hazel E.

doi:10.1016/j.matpr.2018.05.050

Cited by 18 publications

(15 citation statements)

References 17 publications

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“…R2R technology is a preferred method for manufacturing low cost, lightweight and flexible devices. The amplifiers for the signal conditioning chain of the proposed system were manufactured using a R2R-based deposition process [19]. Vacuum metallization by physical vapor deposition (PVD) enables the fabrication of OTFT-based electrodes with all-vacuum printing technique.…”

Section: Organic Thin Film Transistor Circuits Design Sensors Inmentioning

confidence: 99%

Towards Wearable and Flexible Sensors and Circuits Integration for Stress Monitoring

Chen

Anastasova

Zhang

et al. 2020

IEEE J. Biomed. Health Inform.

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Excessive stress is one of the main causes of mental illness. Long-term exposure of stress could affect one's physiological wellbeing (such as hypertension) and psychological condition (such as depression). Multisensory information such as heart rate variability (HRV) and pH can provide suitable information about mental and physical stress. This paper proposes a novel approach for stress condition monitoring using disposable flexible sensors. By integrating flexible amplifiers with a commercially available flexible polyvinylidene difluoride (PVDF) mechanical deformation sensor and a pH-type chemical sensor, the proposed system can detect arterial pulses from the neck and pH levels from sweat located in the back of the body. The system uses organic thin film transistor (OTFT)-based signal amplification front-end circuits with modifications to accommodate the dynamic signal ranges obtained from the sensors. The OTFTs were manufactured on a low-cost flexible polyethylene naphthalate (PEN) substrate using a coater capable of Roll-to-Roll (R2R) deposition. The proposed system can capture physiological indicators and data be interrogated by Near Field Communication (NFC). The device has been successfully tested with healthy subjects, demonstrating its application for real-time stress monitoring.

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Section: Organic Thin Film Transistor Circuits Design Sensors Inmentioning

confidence: 99%

Towards Wearable and Flexible Sensors and Circuits Integration for Stress Monitoring

Chen

Anastasova

Zhang

et al. 2020

IEEE J. Biomed. Health Inform.

Self Cite

View full text Add to dashboard Cite

show abstract

“…For future mass production of transistors, flexographic printing—unlike the other printing techniques such as inkjet printing and screen printing—is promising as it has the potential to both pattern materials on top of substrates at low cost and high speed and print at a speed of around 180 m min −1 . [ 7,8 ] These three printing techniques: inkjet printing, screen printing, and flexographic printing will be discussed in turn in the following sections.…”

Section: Introductionmentioning

confidence: 99%

Flexographic Printing Contributions in Transistors Fabrication

Assaifan

2021

Adv Eng Mater

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Transistors are one of the major components of everyday consumer electronics. With the huge demand for low‐cost and flexible consumer electronics, modern industrially‐compatible transistor‐fabrication techniques such as roll‐to‐roll printing techniques must be given due consideration with a view to replacing conventional complex lithography techniques which make use of toxic chemicals. Such traditional methods are not only time‐consuming but also pose a threat to human health. This review article is concerned with offering insights into the deployment of flexographic printing which has been widely used for food packaging and newspaper production, as a cost‐effective technique for the production of transistors. More specifically, it discusses in detail both advantages of the printing technique and its contributions to fabrication of different vital transistor components such as gate, source, drain, semiconductor, and dielectric layers. It also attends to prepatterning of surfaces for the formation of transistor electrodes using the printing technique. Finally, it addresses the challenges associated with implementing such a technique in industry.

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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. In addition, coating methods such as slot-die coating [45][46][47][48] and spin coating are also employed.…”

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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Flexography Printing for Organic Thin Film Transistors

Cited by 18 publications

References 17 publications

Towards Wearable and Flexible Sensors and Circuits Integration for Stress Monitoring

Towards Wearable and Flexible Sensors and Circuits Integration for Stress Monitoring

Flexographic Printing Contributions in Transistors Fabrication

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

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