scholarly journals Numerical Study on the Optimization of Roll-to-Roll Ultraviolet Imprint Lithography

Coatings ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 573
Author(s):  
Usama Tahir ◽  
Muhammad Ahmad Kamran ◽  
Myung Yung Jeong
Keyword(s):  
Numerical Model ◽  
Numerical Study ◽  
Low Cost ◽  
Industrial Applications ◽  
Contact Angles ◽  
Large Area ◽  
Flexible Displays ◽  
Roll To Roll ◽  
Area Functional ◽  
Uv Resin

Roll-to-roll ultraviolet (R2R-UV) imprinting is a low-cost and high-throughput method that includes the manufacturing of large-area functional films. However, the quality of the final product is obstructed by the bubble entrapment during the imprinting process. In this study, a multi-phase volume of fluid (VOF) numerical model was used to remove bubble entrapment during the R2R imprinting process, which covered all parameters. This new modified numerical model with open-channel boundary conditions was based on the single zone that contains the direct contact of UV resin with the imprinting mold during the filling process. In addition, this model simulated the UV resin filling into microcavities at the preceding and succeeding ends of the imprinting mold. Different patterns of imprinting mold were considered to enhance the fidelity of R2R-UV imprinting for the comprehensive analysis. The experimental results validated through numerical simulations revealed that the bubble entrapment can be controlled by varying various parameters such as speed of the imprinting system, viscosity, contact angles, and pattern shape. The proposed model may be useful for a continuous bubble-free R2R imprinting process in industrial applications that includes flexible displays and micro/nano-optics.

An Investigation onto Polydimethylsiloxane (PDMS) Printing Plate of Multiple Functional Solid Line by Flexographic

2013 ◽  
Vol 844 ◽  
pp. 158-161 ◽  
Author(s):  
M.I. Maksud ◽  
Mohd Sallehuddin Yusof ◽  
M. Mahadi Abdul Jamil
Keyword(s):  
Laser Ablation ◽  
Line Width ◽  
High Speed ◽  
Printed Electronics ◽  
Low Cost ◽  
Flexible Substrates ◽  
Large Area ◽  
Printing Plate ◽  
Roll To Roll ◽  
Printing Processes

Recently low cost production is vital to produce printed electronics by roll to roll manufacturing printing process like a flexographic. Flexographic has a high speed technique which commonly used for printing onto large area flexible substrates. However, the minimum feature sizes achieved with roll to roll printing processes, such as flexographic is in the range of fifty microns. The main contribution of this limitation is photopolymer flexographic plate unable to be produced finer micron range due to film that made by Laser Ablation Mask (LAMs) technology not sufficiently robust and consequently at micron ranges line will not be formed on the printing plate. Hence, polydimethylsiloxane (PDMS) is used instead of photopolymer. Printing trial had been conducted and multiple solid lines successfully printed for below fifty microns line width with no interference between two adjacent lines of the printed images.

scholarly journals Roll-to-Roll fabrication of large area functional organic materials

2012 ◽  
Vol 51 (1) ◽  
pp. 16-34 ◽  
Author(s):  
Roar R. Søndergaard ◽  
Markus Hösel ◽  
Frederik C. Krebs
Keyword(s):  
Organic Materials ◽  
Large Area ◽  
Roll To Roll ◽  
Area Functional

Fabrication of Self-Healable, Robust Superhydrophobic Surfaces Using UV-Crosslinked Nanocomposite Films

2021 ◽  
Vol 21 (12) ◽  
pp. 6212-6216
Author(s):  
Yeon-Ah Park ◽  
Young-Geun Ha
Keyword(s):  
Low Cost ◽  
Synergetic Effect ◽  
Spray Coating ◽  
Uv Curing ◽  
Industrial Applications ◽  
Contact Angles ◽  
Superhydrophobic Surfaces ◽  
Nanocomposite Films ◽  
Self Healing ◽  
Water Contact

Studies on fabricating robust superhydrophobic surfaces by a low-cost method have been rare, despite the recent demand for nature-inspired superhydrophobic surfaces including self-healing ability in various industrial applications. Herein, we propose a fabrication method for self-healable, robust superhydrophobic nanocomposite films by facile solution-processed spray coating and UV curing. The components of the coating solution include functionalized hydrophobic silica nanoparticles for producing high roughness hierarchical textured structures with low surface energy, and UV-crosslinkable v-POSS and bi-thiol hydrocarbon molecules to improve the film stability. As a result of the synergetic effect of the hydrophobic nanoparticles and UV-crosslinked polymeric compounds, the spray-coated and UV-cured nanocomposite films possess excellent superhydrophobicity (water contact angles > 150º) and high stability, in addition to self-healing abilities.

Recent advances in flexible perovskite solar cells

2015 ◽  
Vol 51 (79) ◽  
pp. 14696-14707 ◽  
Author(s):  
B. Susrutha ◽  
Lingamallu Giribabu ◽  
Surya Prakash Singh
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Solar Cell ◽  
Low Cost ◽  
Perovskite Solar Cells ◽  
Large Area ◽  
Roll To Roll ◽  
Recent Developments ◽  
Reduced Dimension ◽  
Thin Film Photovoltaics

Flexible thin-film photovoltaics facilitate the implementation of solar devices into portable, reduced dimension, and roll-to-roll modules. In this review, we describe recent developments in the fabrication of flexible perovskite solar cells that are low cost and highly efficient and can be used for the fabrication of large-area and lightweight solar cell devices.

Fabrication of Large Area, 70 nm Pitch Nanograting Patterns by Nanoimprint Lithography Using Flexible Polymer Stamp

2011 ◽  
Vol 483 ◽  
pp. 48-52
Author(s):  
Fan Tao Meng ◽  
Jin Kui Chu ◽  
Gang Luo ◽  
Zhi Tao Han ◽  
Zhi Wen Wang
Keyword(s):  
Nanoimprint Lithography ◽  
Low Cost ◽  
Industrial Applications ◽  
Inorganic Materials ◽  
Attractive Alternative ◽  
Large Area ◽  
Good Shape ◽  
Low Surface Energy ◽  
Flexible Polymer ◽  
Size Uniformity

Flexible polymer stamps are considered as an attractive alternative to rigid, brittle and expensive stamps made of inorganic materials because of their low cost and ease of fabrication. In this paper, we present a nanoimprint process to fabricate large area, high-resolution nanograting patterns using flexible polymer stamp made from fluoropolymer. The flexibility and low surface energy of polymer stamp provide a clean release without fracture or deformation of the stamp and of the replicated nanograting. Large-area, high-density nanograting patterns with good shape homogeneity and size uniformity have been successfully fabricated using the flexible polymer stamp with advantages of its good conformal contact and low adhesion. Using flexible polymer stamps can resolve many serious issues in NIL and therefore can bring it to real industrial applications.

High quality diffractive optical elements (DOEs) using SMILE imprint technique

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Simon Drieschner ◽  
Fabian Kloiber ◽  
Marc Hennemeyer ◽  
Jan J. Klein ◽  
Manuel W. Thesen
Keyword(s):  
Soft Lithography ◽  
High Efficiency ◽  
Low Cost ◽  
Industrial Applications ◽  
Diffractive Optical Elements ◽  
Large Area ◽  
High Quality ◽  
Optical Elements ◽  
Uv Curable ◽  
Aspect Ratios

Abstract Augmented reality (AR) enhancing the existing natural environment by overlaying a virtual world is an emerging and growing market and attracts huge commercial interest into optical devices which can be implemented into head-mounted AR equipment. Diffractive optical elements (DOEs) are considered as the most promising candidate to meet the market’s requirements such as compactness, low-cost, and reliability. Hence, they allow building alternatives to large display headsets for virtual reality (VR) by lightweight glasses. Soft lithography replication offers a pathway to the fabrication of large area DOEs with high aspect ratios, multilevel features, and critical dimensions below the diffractive optical limit down to 50 nm also in the scope of mass manufacturing. In combination with tailored UV-curable photopolymers, the fabrication time can be drastically reduced making it very appealing to industrial applications. Here, we illustrate the key features of high efficiency DOEs and how the SMILE (SUSS MicroTec Imprint Lithography Equipment) technique can be used with advanced imprint photopolymers to obtain high quality binary DOEs meeting the market’s requirements providing a very versatile tool to imprint both nano- and microstructures.

A flexible large-area triboelectric generator by low-cost roll-to-roll process for location-based monitoring

2016 ◽  
Vol 247 ◽  
pp. 206-214 ◽  
Author(s):  
Xiaoliang Cheng ◽  
Yu Song ◽  
Mengdi Han ◽  
Bo Meng ◽  
Zongming Su ◽  
...  
Keyword(s):  
Low Cost ◽  
Large Area ◽  
Roll To Roll ◽  
Triboelectric Generator

Roll-to-Roll Nanoimprinting Metamaterials

2012 ◽  
Vol 1412 ◽  
Author(s):  
Anton Greenwald ◽  
Jae Ryu ◽  
Yisi Liu ◽  
Rana Biswas ◽  
Jong Ok ◽  
...  
Keyword(s):  
Low Cost ◽  
Aluminum Layer ◽  
Large Area ◽  
Coated Substrate ◽  
Roll To Roll ◽  
Flexible Polymer ◽  
Fine Pattern ◽  
Polymer Mold ◽  
Continuous Fabrication ◽  
Flexible Polymer Substrate

ABSTRACTWe investigated continuous fabrication of a large area 2-D metamaterial comprising a metal dot array on a dielectric coated substrate. We demonstrated patterning of metal dots arrays of varying patterns and shapes with diameter of about 2.5 μm and metal-to-metal spacing from 0.3 to 2.5 μm using a nano-imprinting stamp on a roller. The pattern was first fabricated on a standard photolithography mask, reproduced onto a silicon wafer master mold, and then transferred to a flexible polymer mold that was wrapped around a metal roller. The method was used to pattern a thin Al layer on top of SiO2 on a flexible polymer substrate. The aluminum was coated with a resist and the roller moved over the substrate with adjustable speed and pressure to imprint the fine pattern into the resist. The resist was cured, and a very thin layer of residual resist was removed by RIE, followed by a standard etching treatment for patterning the aluminum layer.The as-etched pattern had very few defects and the optical properties of the metamaterial were excellent and correlated well with simulations. This work has shown that low cost, rapid roll-to-roll processing of 2-D metamaterial structures is possible.

Failure Mechanism and Reliability Design Study of Bendable Electronic Module

2012 ◽  
Author(s):  
Changwoon Han ◽  
Chulmin Oh ◽  
Won Sik Hong
Keyword(s):  
Numerical Model ◽  
Failure Mechanism ◽  
Manufacturing Process ◽  
Mobile Application ◽  
Low Cost ◽  
Schematic Diagram ◽  
Anisotropic Conductive Film ◽  
Reliability Design ◽  
Roll To Roll ◽  
Conductive Film

An electronic module was designed and developed to bend easily and repeatedly for a mobile application by a low-cost roll-to-roll manufacturing process [1]. The schematic diagram of the bendable module and its numerical model are shown at Fig.1. In the module, a thin silicon electronic chip is embedded in a polymer-based encapsuling adhesive between flexible copper clad polyimide (PI) layers. The thickness of silicon chip is 50 μm. Au bump is attached to the silicon and copper lines with anisotropic conductive film (ACF).

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