Facile patterning using dry film photo-resists for flexible electronics: Ag nanowire networks and carbon nanotube networks

An, Cheol Hyun; Kim, Sun-Ho; Lee, Hoo-Jeong; Hwang, Byungil

doi:10.1039/c7tc00885f

Cited by 29 publications

(15 citation statements)

References 25 publications

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“…However, the formation of ITO TEs requires a plasma-based sputtering process with a post-processing stage at high temperature, which causes severe damage to the adjacent active layers. Therefore, a number of alternatives to replace ITO, such as graphene, carbon nanotubes, conductive polymers, metal nanowires, nanofibers, and nanotroughs, have been intensively studied. − Ag nanowires (AgNWs) are the most promising materials for flexible/stretchable devices owing to their excellent optoelectronic properties and mechanical reliability. − In addition, their capabilities for large-scale synthesis and facile coating of large substrates make them attractive from a manufacturing perspective …”

Section: Introductionmentioning

confidence: 99%

“…10−13 In addition, their capabilities for large-scale synthesis and facile coating of large substrates make them attractive from a manufacturing perspective. 14 The use of nanoscale materials has become more prevalent as techniques for their transfer between different substrates have been developed. 15−17 For example, the fabrication of graphene-based TEs in a roll-to-roll process became possible with the transfer technology of large-scale graphene on a Cu foil to a polymer substrate using a thermal release tape.…”

Section: Introductionmentioning

confidence: 99%

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High-Performance Transparent Quantum Dot Light-Emitting Diode with Patchable Transparent Electrodes

Kim

et al. 2019

ACS Appl. Mater. Interfaces

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Patchable electrodes are attractive for applications in optoelectronic devices because of their easy and reliable processability. However, development of reliable patchable transparent electrodes (TEs) with high optoelectronic performance is challenging; till now, optoelectronic devices fabricated with patchable TEs have been exhibiting limited performance. In this study, Ag nanowire (AgNW)/poly(methyl methacrylate) (PMMA) patchable TEs are developed and the highly efficient transparent quantum dot light-emitting diodes (QLEDs) using the patchable TEs are fabricated. AgNWs with optimized optoelectronic properties (figure of merit ≈ 3.3 × 10–2) are coated by an ultrathin PMMA nanolayer and transferred to thermal release tapes that enable physical attachment of TEs on the QLEDs without a significant damage to the adjacent active layer. The transparent QLEDs using patchable transparent top electrodes display excellent performance, with the maximum total luminance and current efficiency of 27 310 cd·m–2 and 45.99 cd·A–1, respectively. Fabricated by all-solution-based processes, these QLEDs exhibit the best performance to date among devices adopting patchable top electrodes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Performance Transparent Quantum Dot Light-Emitting Diode with Patchable Transparent Electrodes

Kim

et al. 2019

ACS Appl. Mater. Interfaces

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“…The main advantages of the photolithographic technique include producing patterns of various sizes and shapes with high precision, which enables one to design sophisticated and high-resolution micropatterns and engineer complex and multifunctional electronic devices. The well-established technique has been widely used to realize the patterns of MNWs with different feature sizes. ,− A typical photolithographic process of an MNWN contains five major steps: (i) coating a photoresist on the surface of the AgNW film; (ii) exposing the photoresist-coated AgNW film with a patterned photomask; (iii) developing a photoresist layer developed by using a proper solution; (iv) etching a nonpatterned area by the etchant solution; (v) fabricating the patterned AgNW network after striping the remaining photoresist layer. As shown in Figure a–c, AgNW patterns with line width ranging from 200 down to 20 μm were successfully fabricated using photolithography.…”

Section: Subtractive Patterning Methodsmentioning

confidence: 99%

Patterning of Metal Nanowire Networks: Methods and Applications

Huang

Zhu

2021

ACS Appl. Mater. Interfaces

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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.

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“…In addition, the mechanical brittleness of ITO limits its use in flexible electronics [7,8]. To overcome these limitations, several ITO alternatives have been reported, including graphene [9,10], carbon nanotubes [11,12], metal meshes [13,14], and metal nanowires [15,16]. Among them, Ag nanowires are considered to be the most promising alternative because of their good optical and electrical performance, scalable synthesis, and ease of coating to form electrodes [17,18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Properties of Substrates on Flexibility of Ag Nanowire Electrodes under a Large Number of Bending Cycles

Yun

Hwang

2021

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Ag nanowire electrodes have attracted considerable attention because of their potential applications in next-generation flexible electronics. However, there is a paucity of studies on the mechanical properties of Ag nanowire electrodes subjected to a large number of bending cycles. In this study, the effects of the substrate on the mechanical behavior of Ag nanowire electrodes were studied for a high bending frequency. The mechanical reliability of the Ag nanowire electrodes fabricated on a polyethylene terephthalate (PET) substrate was better than that for a polyimide (PI) substrate; the increase in the resistance of the PET-based Ag nanowire electrode was 1.07%, while that of the PI-based one was 1.23%. Nanoindentation tests showed that the elastic modulus of PI was larger than that of PET. This resulted in a lower bending strain on PET-based Ag nanowire electrodes compared to those on PI-based ones, because of the smaller distance from the neutral plane of the PET-based system. Our study showed that the mechanical properties of the substrate influenced the strain imposed on the thin layer on the substrates, which, in turn, determines the mechanical reliability of the thin-layer/substrate multilayer system.

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Facile patterning using dry film photo-resists for flexible electronics: Ag nanowire networks and carbon nanotube networks

Abstract: The Ag nanowire and CNT networks are patterned with a pattern width up to 30 μm by using dry film photo resists (DFRs). The systematic characterization of the electrical and mechanical properties of the patterned Ag nanowire networks revealed pattern width dependent property changes.

Cited by 29 publications

References 25 publications

High-Performance Transparent Quantum Dot Light-Emitting Diode with Patchable Transparent Electrodes

High-Performance Transparent Quantum Dot Light-Emitting Diode with Patchable Transparent Electrodes

Patterning of Metal Nanowire Networks: Methods and Applications

Effect of Mechanical Properties of Substrates on Flexibility of Ag Nanowire Electrodes under a Large Number of Bending Cycles

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