Multilevel Self-Aligned Microcontact Printing System

Choonee, Kaushal; Syms, R.R.A.

doi:10.1021/la100960z

Cited by 9 publications

(13 citation statements)

References 36 publications

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“…DCP can potentially be scaled up to pattern high-throughput, large-scale paper substrates by substituting the serial debossing method used here with a rotary debossing method as well as increasing the length of the printing roller and printing speed. Although DCP may not accommodate large, recessed areas due to unwanted contact with the inked roller, this limitation should be remedied by incorporating nonfunctional support structures, which is a strategy that has been used in microcontact printing to prevent roof collapse of soft polymer stamps. , Continued refinement of DCP will focus on quantifying key parameters of the ink formulation (viscosity, ink loading, and surface tension), exploring different types of paper substrates (density, thickness, hydrophobicity, roughness, and sheer strength), and optimizing printing process parameters such as the stiffness of the printing roller and printing speed. Developing DCP for the fabrication of multilayered devices, including those that incorporate different patterns, is an important future direction for this work as well as exploring other types of substrates beyond paper that can be debossed.…”

Section: Discussionmentioning

confidence: 99%

Debossed Contact Printing as a Patterning Method for Paper-Based Electronics

Mechael,

D’Amaral,

Carmichael

2023

ACS Appl. Mater. Interfaces

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The proliferation of printed electronic devices is feeding the growth of the Internet of Things, with devices deployed everywhere to collect and communicate data. At the same time, the increase in low-cost disposable devices is a cause for serious environmental concern. In particular, widely used plastic substrates such as poly(ethylene terephthalate) are persistent hazards to the environment. Paper is promising as a greener substrate for printed electronics because it is biodegradable and sourced from renewable materials as well as being low cost and compatible with roll-to-roll printing. However, the porous microstructure of paper promotes wicking of functional inks, leading to poor electrical performance and printing resolution. Hydrophobic coatings applied to the surface of paper create a planarized, printable surface, but these materials may compromise biodegradability and/or recyclability. This paper describes a new resist-free patterning method for printed paperbased electronics that takes advantage of the porous structure of paper. Debossed contact printing uses the pressure from a debossing tip to compress the porous structure of paper and create a patterned relief structure. Printing functional inks with an unpatterned roller deposits ink only on the raised regions of the relief structure. We demonstrate debossed contact printing of silver, carbon black, and conducting polymer inks and show that this new fabrication method is suitable for the fabrication of printed devices with dense features. We demonstrate the fabrication of antennas and patterned electrodes for RFID and smart wallpaper applications, respectively.

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Section: Discussionmentioning

confidence: 99%

Debossed Contact Printing as a Patterning Method for Paper-Based Electronics

Mechael,

D’Amaral,

Carmichael

2023

ACS Appl. Mater. Interfaces

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“…Most of the thin-film layers can be deposited by conventional deposition methods such as sputtering. The polymer active layer can be transferred to the PMMA substrate using soft lithography technologies such as microcontact printing, 28 while following the topography in the PMMA substrate.…”

Section: Device Structures and Analytical Methodsmentioning

confidence: 99%

Shell-shaped active layers for omnidirectional organic photovoltaic cells

Hah

2022

J. Photon. Energy

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.For the employment of organic photovoltaic cells in wearable electronic systems, improvements in energy conversion efficiency and omnidirectionality (angular coverage) are highly appreciated. This study aims at those improvements by introducing shell-shaped active layers. The proposed device structures enhance light absorption and angular range through light coupling to guided modes in the active layer. Two shapes, i.e., a triangle and a semicircle, are examined for the shell cross-sections. Numerical simulation using finite-element analysis and finite-difference time-domain methods demonstrates that the devices with the triangular-shell-shaped active layers exhibit an average absorption enhancement of up to 63% for transverse electric (TE)-polarization and up to 32% for transverse magnetic (TM)-polarization when compared with the flat active layers of the same thicknesses. The average enhancements of the semicircular-shell-shaped active layers are found to be slightly lower than those values, with 60% for TE and 28% for TM. The examined structures also show good omnidirectionality with decent absorption up to an 81 deg incidence angle for the triangular-shell-shaped device and up to a 76 deg angle for the semicircular one when TM polarization is considered. These absorption enhancements and improved angular coverages make the proposed structures highly attractive for wearable electronic system applications.

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“…For μCP experiments, the stamp and substrates were arranged as in figure 1. The top face of the stamp was inked with 1hexadecanethiol (as described in [33]), whilst the Au coated glass substrate was placed on the stamp spacer and held in position by the lid. In this configuration, the flying height, s, is 190 μm.…”

Section: Contact and μCp With A Hydraulic Drivementioning

confidence: 99%

Hydraulically actuated micro-contact printing engines

Choonee¹,

Syms²

2011

J. Micromech. Microeng.

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Micro-contact printing (μCP) is a rapid, simple and well-established method of microscale biochemical patterning. However, there is a lack of inexpensive and accessible tools for accurately controlling contact during the printing process. In this paper, controlled μCP using hydraulic actuation is demonstrated. Complete printing systems, including a substrate placed at a calibrated height above an elastic stamp attached to a hydraulic chuck, are constructed and characterized. The chucks are made from Perspex using precision machining while the stamp is made by casting against microfabricated silicon masters. The total patterned area is ∼25 mm 2 and 10 μm wide features have been printed.

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Multilevel Self-Aligned Microcontact Printing System

Cited by 9 publications

References 36 publications

Debossed Contact Printing as a Patterning Method for Paper-Based Electronics

Debossed Contact Printing as a Patterning Method for Paper-Based Electronics

Shell-shaped active layers for omnidirectional organic photovoltaic cells

Hydraulically actuated micro-contact printing engines

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