Film formation from polymer solution using inkjet printing method

Kaneda, Masayuki; Ishizuka, Hirotaka; Sakai, Yasuyuki; Fukai, Jun; Yasutake, Shigekazu; Takahara, Atsushi

doi:10.1002/aic.11154

Cited by 30 publications

(26 citation statements)

References 19 publications

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“…Research showed that this small contact area tends to generate large contact resistance in bottom-contact OTFTs [48]. In contrast, top-contact…”

Section: Top-contact and Bottom-contact Otftsmentioning

confidence: 99%

“…For instance, the choice of solvent and ink concentration affects the evaporation rate of the ink droplet, which in term influences configuration of the printed film (i.e., dot-like or ring-like). A low evaporation rate yields small dot-like film and a fast evaporation rate results in the wide ring-like film [48]. Ink formulation also determines the spreading of the ink droplet on the substrate, which affects film uniformity and image resolution.…”

Section: Hybrid Photolithography-inkjet Printing Scheme For Fullypattmentioning

confidence: 99%

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Organic Thin Film Transistor Integration

Li¹

2011

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This thesis examines strategies to exploit existing materials and techniques to advance organic thin film transistor (OTFT) technology in device performance, device manufacture, and device integration. To enhance device performance, optimization of plasma enhanced chemical vapor deposited (PECVD) gate dielectric thin film and investigation of interface engineering methodologies are explored. To advance device manufacture, OTFT fabrication strategies are developed to enable organic circuit integration. Progress in device integration is achieved through demonstration of OTFT integration into functional circuits for applications such as active-matrix displays and radio frequency identification (RFID) tags.OTFT integration schemes featuring a tailored OTFT-compatible photolithography process and a hybrid photolithography-inkjet printing process are developed. They enable the fabrication of fully-patterned and fully-encapsulated OTFTs and circuits. Research on improving device performance of bottom-gate bottom-contact poly(3,3′′′-dialkyl-quarterthiophene) (PQT-12) OTFTs on PECVD silicon nitride (SiN x ) gate dielectric leads to the following key conclusions: (a) increasing silicon content in SiN x gate dielectric leads to enhancement in field-effect mobility and on/off current ratio; (b) surface treatment of SiN x gate dielectric with a combination of O 2 plasma and octyltrichlorosilane (OTS) selfassembled monolayer (SAM) delivers the best OTFT performance; (c) an optimal O 2 plasma treatment duration exists for attaining highest field-effect mobility and is linked to a "turnaround" effect; and (d) surface treatment of the gold (Au) source/drain contacts by 1-octanethiol SAM limits mobility and should be omitted. There is a strong correlation between the electrical characteristics and the interfacial characteristics of OTFTs. In particular, the device mobility is influenced by the interplay of various interfacial mechanisms, including surface energy, surface roughness, and chemical composition.Finally, the collective knowledge from these investigations facilitates the integration of OTFTs into organic circuits, which is expected to contribute to the development of new generation of all-organic displays for communication devices and other pertinent applications. A major outcome of this work is that it provides an economical means for organic transistor and circuit integration, by enabling use of the well-established PECVD infrastructure, yet not compromising the performance of electronics.iv

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“…Research showed that this small contact area tends to generate large contact resistance in bottom-contact OTFTs [48]. In contrast, top-contact…”

Section: Top-contact and Bottom-contact Otftsmentioning

confidence: 99%

Section: Hybrid Photolithography-inkjet Printing Scheme For Fullypattmentioning

confidence: 99%

Organic Thin Film Transistor Integration

Li¹

2011

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“…Recently, various authors have demonstrated an understanding of drying processes based on the evaporation parameters of inks, causing various surface topographies of printed films to manifest themselves [3]- [5]. To solve some of the observed effects, Tekin et.…”

Section: B Motivationmentioning

confidence: 99%

Hydrostatic Optimization of Inkjet-Printed Films

2010

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In this work, we study the optimization of the geometry of inkjet-printed polymer films and develop a simple analytic framework to understand our results and establish limitations on inkjet-printed patterns. We show how drop spacing and ink concentration affect the thickness of a printed film and how hydrostatic conditions with contact angle hysteresis have to be considered to print optimized rectangular features. If advancing and receding contact angle are not taken into account, printed features will either bulge or break up into smaller beads. Thus, we provide a comprehensive analysis of the limits of film formation using regular assemblies of droplets.

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“…Evaporation of monocomponent droplets has been studied for decades [11][12][13][14][15]. Recently, experimental and numerical investigations have been focused on multicomponent evaporation because it has more applications and its mechanism is more complicated than monocomponent droplets [2][3][4][5][6][7][16][17][18]. Among the first researchers to study multicomponent droplets, Newbold and Amundson [16] derived an accurate model to describe the evaporation of a…”

Section: Introductionmentioning

confidence: 99%

Internal flow patterns of an evaporating multicomponent droplet on a flat surface

Qiu

2016

International Journal of Thermal Sciences

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Evaporation processes of droplets with different ethanol/water volume ratios (0% ethanol/100% water, 5% ethanol/95% water and 10% ethanol/90% water, respectively) on a hydrophobic silicon dioxide surface covered by a layer of FAS were investigated by PIV method. It was found that the evaporation process of heated two-component droplets can be divided into three stages, downward vortex stage, transition stage and upward vortex stage sequentially, while for a pure water droplet only the upward vortex stage exists. The mechanism of those three stages was analysed in detail, combining previous theories of Marangoni effects, buoyancy effect and experiment results. Besides, it was also found that initial composition and input power affected the duration of the three stages, especially the downward vortices and transition stage which are related to ethanol evaporation: In low input power, the transition stage of the high ethanol fraction droplet occurred earlier and lasted a shorter time than the low ethanol fraction droplet, while, in high input power, the transition stage of the low ethanol fraction droplet occurred earlier and lasted a shorter time than the high ethanol fraction droplet. That phenomenon was also analysed with ethanol evaporation in different thermal and solutal conditions. INTRODUCTIONThe evaporation of droplets is important in many applications such as coatings (automobile exteriors and photoresist deposition), droplet-based microfluidics [10], inkjet printing [9], film formation [2] and even spotting DNA microarray data [1]. Evaporation of monocomponent droplets has been studied for decades [11][12][13][14][15]. Recently, experimental and numerical investigations have been focused on multicomponent evaporation because it has more applications and its mechanism is more complicated than monocomponent droplets [2][3][4][5][6][7][16][17][18]. Among the first researchers to study multicomponent droplets, Newbold and Amundson [16] derived an accurate model to describe the evaporation of a

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Film formation from polymer solution using inkjet printing method

Cited by 30 publications

References 19 publications

Organic Thin Film Transistor Integration

Organic Thin Film Transistor Integration

Hydrostatic Optimization of Inkjet-Printed Films

Internal flow patterns of an evaporating multicomponent droplet on a flat surface

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