Versatile roll-to-roll spatial ALD production equipment for flexible devices

2018 ◽  
Author(s):  
Don Veri ◽  
Keyword(s):  
Production Equipment ◽  
Flexible Devices ◽  
Roll To Roll

scholarly journals Numerical Modeling of Ink Widening and Coating Gap in Roll-to-Roll Slot-Die Coating of Solid Oxide Fuel Cell Electrolytic Layer

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2927
Author(s):  
Seongyong Kim ◽  
Jongsu Lee ◽  
Minho Jo ◽  
Changwoo Lee
Keyword(s):  
Coating Thickness ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Mean Square ◽  
Large Area ◽  
Functional Layer ◽  
Slot Die Coating ◽  
Flexible Devices ◽  
Roll To Roll ◽  
Slot Die

Slot-die coatings are advantageous when used for coating large-area flexible devices; in particular, the coating width can be controlled and simultaneous multi-layer coatings can be processed. To date, the effects of ink widening and the coating gap on the coating thickness have only been considered in a few studies. To this end, we developed two mathematical models to accurately estimate the coating width and thickness that consider these two effects. We used root mean square deviation (RMSD) to experimentally verify the developed method. When the coating gap was increased, the coating width increased and the coating thickness decreased. Experimental results showed that the estimated performances of the coating width and thickness models were as high as 98.46% and 95.8%, respectively. We think that the developed models can be useful for determining the coating conditions according to the ink properties to coat a functional layer with user-defined widths and thicknesses in both lab- and industrial-scale roll-to-roll slot-die coating processes.

Flexible Printed Supercapacitors Based on Nanostructured Materials

2013 ◽  
Vol 1540 ◽  
Author(s):  
Saeed Maleksaeedi ◽  
Bee Yen Tay ◽  
Pooi See Lee ◽  
Foo Khuen Lai ◽  
Chee Wai Lu
Keyword(s):  
Nanostructured Materials ◽  
Screen Printing ◽  
Printed Electronics ◽  
Current Collector ◽  
Solid Polymer ◽  
Screen Printing Method ◽  
Flexible Devices ◽  
The Past ◽  
Roll To Roll ◽  
A Current

ABSTRACTWith the advent of printed electronics and flexible devices, flexible energy storage has received so much attention in the past few years. In this work, a scalable process for manufacturing of a flexible supercapacitor device based on nanostructured PANI and MnO2 was demonstrated. In this process, nanostructured materials are transformed into form of a printable ink which is applied on a current collector using a simple screen printing method, which can be used in a roll to roll scheme. The flexible device was assembled using a solid polymer electrolyte and the electrochemical performance of the devices was evaluated. A specific capacitance of 120 F/g and 89 F/g for two symmetrical devices based on PANI and MnO2 were obtained respectively. The devices are showing relatively good cyclability and columbic efficiency.

scholarly journals Numerical Modeling of Ink Widening and Coating Gap in Roll-to-Roll Slot-Die Coating of Solid Oxide Fuel Cell Electrolytic Layer

2020 ◽  
Author(s):  
Seongyong Kim ◽  
Jongsu Lee ◽  
Minho Jo ◽  
Changwoo Lee
Keyword(s):  
Coating Thickness ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Mean Square ◽  
Large Area ◽  
Functional Layer ◽  
Slot Die Coating ◽  
Flexible Devices ◽  
Roll To Roll ◽  
Slot Die

Slot-die coatings are advantageous when used for coating large-area flexible devices; in particular, the coating width can be controlled, and simultaneous multi-layer coatings can be processed. Till date, the effects of ink widening and coating gap on the coating thickness have only been considered in a few studies. To this end, we developed two mathematical models to accurately estimate the coating width and thickness considering these two effects. We used root mean square deviation (RMSD) to experimentally verify the developed method. The coating width was seen to increase and the coating thickness was seen to decrease when the coating gap was increased. Experimental results showed that the estimation performances of the coating width and thickness models were as high as 98.46 % and 95.8 %, respectively. We believe that the developed models can be useful for determining the coating conditions according to the ink properties to coat a functional layer with user-defined widths and thicknesses in both lab- and industrial-scale roll-to-roll slot-die coating processes.

scholarly journals Optimizing Roller Design to Improve Web Strain Uniformity in Roll-to-Roll Process

2020 ◽  
Vol 10 (21) ◽  
pp. 7564 ◽  
Author(s):  
Yousung Kang ◽  
Yongho Jeon ◽  
Hongkyu Ji ◽  
Sin Kwon ◽  
Ga Eul Kim ◽  
...  
Keyword(s):  
Mass Production ◽  
Strain Distribution ◽  
Electronic Circuit ◽  
Low Cost ◽  
Comparative Experiment ◽  
Machine Direction ◽  
Flexible Devices ◽  
Roll To Roll ◽  
Register Error ◽  
The Web

In this work, we investigated the compensation of strain deviation in the machine direction of a web in the roll-to-roll process. As flexible devices have become popular, many researchers have begun to study roll-to-roll processes for the mass-production of flexible devices at low cost. In the continuous roll-to-roll process, an electronic circuit pattern is printed on the web while the web is transferring. Due to tension and Poisson’s ratio, a non-uniform strain distribution can occur in the web. This strain distribution occurs mainly at the center of the web and causes a register error in the machine direction. In this work, we designed a roller to minimize the strain deviation. The design of the compensation roller was optimized using the design of experiments (DOE) methodology and analysis of variance (ANOVA), and the compensation performance was verified through experiments and simulations. According to the results of a comparative experiment conducted to confirm the correcting performance of the optimized roller, the strain deviation in the machine direction decreased by approximately 48% with the proposed roller compared to that of the conventional roller.

Cracked ITO on Polyester Film Substrates for Electro-Optic Applications

2014 ◽  
Vol 526 ◽  
pp. 15-20 ◽  
Author(s):  
John L. West ◽  
Da Wei Lee
Keyword(s):  
Indium Tin Oxide ◽  
Radius Of Curvature ◽  
Flexible Substrates ◽  
Flat Panel Displays ◽  
Flexible Devices ◽  
Polymer Dispersed Liquid Crystal ◽  
Roll To Roll ◽  
Electro Optic ◽  
Polymer Dispersed ◽  
Transparent Conducting Electrodes

Vacuum deposited indium tin oxide, ITO, is the material of choice for producing the transparent conducting electrodes used in a wide variety of electro-optic applications, including flat panel displays and solar cells. In addition to rigid substrates such as glass, ITO can be coated on flexible substrates for the production of flexible devices. Because the ITO is brittle it easily cracks if the flexible substrates are bent. The cracking of the ITO is therefore viewed within the industry as a major problem. Here we demonstrate how we can control the cracking of the ITO to produce uniform electrodes. This is accomplished by bending the film around a tight radius of curvature. The electrodes are narrow having a width of 5~10 μm. The cracks separating the electrodes are much narrower with a width of less than 0.05 μm. We demonstrate the use of these substrates using a polymer dispersed liquid crystal switchable window that can be switched in individual lines creating an electronic venetian blind effect. The addressed lines in the PDLC are defined by the contact electrode and by the applied field. Because the cracks are much smaller than the thickness of the active PDLC material they are not visible. In addition to switchable windows these substrates can be used to make passive matrix displays and touch screens. Uni-axially cracking can be easily integrated into a roll-to-roll manufacturing process.

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