Application of patterned Ag-nanowire networks to transparent thin-film heaters and electrodes for organic light-emitting diodes

Self Cite

172

123

In this study, a transparent and stretchable thin-film capacitive strain sensor based on patterned Ag nanowire networks (AgNWs) was successfully fabricated. The AgNWs were patterned using a capillary force lithography (CFL) method and were embedded onto the surface of the polydimethylsiloxane substrate. The strain (ε) sensitivity of the capacitive strain sensor was controlled and enhanced by patterning the AgNWs into electrodes with an interdigitated shape. The interdigitated capacitive strain sensor (ICSS) is expected to have -1.57 gauge factor (GF) at 30% ε by calculation, which is much higher than the sensitivity of typical parallel-plate-type capacitive strain sensors. Because of the interdigitated pattern of the electrodes, the GF of the ICSS was increased up to -2.0. The ICSS had no hysteresis behavior up to ε values of 15% and showed stable ε sensing performance during the repeated stretching test at ε values of 10% for 1000 cycles. Furthermore, there was no cross talk between ε and pressure sensing in the AgNW-based ICSS, which was found to be insensitive to externally applied pressure. The ICSS was then used to detect the finger and wrist muscle motions of the human body to simulate its application to large and small ε sensing.

Section: Introductionmentioning

confidence: 99%

Wearable and Transparent Capacitive Strain Sensor with High Sensitivity Based on Patterned Ag Nanowire Networks

Kim

Park

2017

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172

123

“…Furthermore, the aligned network of TCEs is favorable to device performances and can reduce the fine pattern failure rate. MNW patterns can also be obtained via a CFL process. , As shown in Figure c, the PDMS stamp with grooves of interdigitated rectangular line patterns was first placed in contact with the precoated AgNW film. Then, a UV-curable hydrogel solution was dropped at the edge of the PDMS stamp, and it can flow into and fill the cavities of the PDMS by a capillary force.…”

Section: Subtractive Patterning Methodsmentioning

confidence: 99%

Patterning of Metal Nanowire Networks: Methods and Applications

Huang

Zhu

2021

With the advance in flexible and stretchable electronics, one-dimensional nanomaterials such as metal nanowires have drawn much attention in the past 10 years or so. Metal nanowires, especially silver nanowires, have been recognized as promising candidate materials for flexible and stretchable electronics. Owing to their high electrical conductivity and high aspect ratio, metal nanowires can form electrical percolation networks, maintaining high electrical conductivity under deformation (e.g., bending and stretching). Apart from coating metal nanowires for making large-area transparent conductive films, many applications require patterned metal nanowires as electrodes and interconnects. Precise patterning of metal nanowire networks is crucial to achieve high device performances. Therefore, a high-resolution, designable, and scalable patterning of metal nanowire networks is important but remains a critical challenge for fabricating high-performance electronic devices. This review summarizes recent advances in patterning of metal nanowire networks, using subtractive methods, additive methods of nanowire dispersions, and printing methods. Representative device applications of the patterned metal nanowire networks are presented. Finally, challenges and important directions in the area of the patterning of metal nanowire networks for device applications are discussed.

“…For AgNW electrodes to be used as electrodes for deformable displays such as OLED and micro-LED display, high-resolution patterning must be possible because high image resolution should be obtained under mechanical deformation. − A large number of studies have been reported for the fine patterning of AgNW electrodes, which includes photolithography using photoresists, poly(dimethylsiloxane) (PDMS) stamps, lasers, and insulator printing methods. − Photolithography is a widespread method for the fine and precise patterning of AgNW electrodes. Much effort has been made to reduce its use in the actual process because photolithography is expensive and cumbersome at the same time. − Laser patterning is efficient because it can make patterns directly in one step without any use of photomasks or chemical etching processes, but it has the disadvantage of requiring expensive equipment and slow production speed.…”

Section: Introductionmentioning

confidence: 99%

“…However, this method needs optimization of the AgNW ink considering AgNW content, surface energy modifiers, and organic binders. Unlike these methods, simple AgNW patterning processes that use capillary flow characteristics of the AgNW solution using PDMS stamps have been published, , but they have a limitation in forming uniform patterns in a large area.…”

Section: Introductionmentioning

confidence: 99%

“…26 However, this method needs optimization of the AgNW ink considering AgNW content, surface energy modifiers, and organic binders. Unlike these methods, simple AgNW patterning processes that use capillary flow characteristics of the AgNW solution using PDMS stamps have been published, 27,28 Meanwhile, for the AgNW electrodes to be used as electrodes of OLED displays, not only the fine patterning but also the surface roughness issue must be considered. Rough surfaces of AgNW electrodes can cause high leakage current or short circuit of the OLED devices.…”

Section: ■ Introductionmentioning

confidence: 99%

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Embedded Reverse-Offset Printing of Silver Nanowires and Its Application to Double-Stacked Transparent Electrodes with Microscale Patterns

Kim

Won

Seo

et al. 2021

We propose an embedded reverse-offset printing (EROP) method, which generates silver nanowire (AgNW) transparent electrodes for display applications. The proposed EROP method can solve the two critical issues of microscale pattern formation and surface planarization. The AgNW electrode had a transmittance of 82% at 550 nm, a sheet resistance of 12.2 Ω/sq, and a 3.27 nm smooth surface. We realized the roll-based pattern formation of AgNW on a plastic substrate as small as 10 μm with negligible step differences to facilitate the proposed method. The proposed EROP method also produced a double-stacked AgNW electrode, enabling the simultaneous operation of separately micropatterned devices. To verify the usefulness of EROP, we fabricated an organic light-emitting diode (OLED) device to demonstrate leakage current reduction and efficiency improvement compared with a conventional indium tin oxide (ITO)-based OLED device. The EROP-based OLED showed 38 and 25% higher current efficiencies than an insulator-patterned AgNW OLED and a conventional ITO-based OLED, respectively.