Contact pattern sensitivity and precision machine control in roll-to-roll microcontact printing

2013 ◽  
Vol 1529 ◽  
Author(s):  
Joseph E. Petrzelka ◽  
Melinda R. Hale ◽  
David E. Hardt
Keyword(s):  
Nanoimprint Lithography ◽  
High Speed ◽  
Microcontact Printing ◽  
Low Cost ◽  
Precise Control ◽  
Lithographic Patterning ◽  
Roll To Roll ◽  
Positioning Stage ◽  
Pattern Sensitivity

ABSTRACTScaling contact lithography (microcontact printing, microflexography, and nanoimprint lithography) to large roll-to-roll platforms will enable high speed, low cost lithographic patterning of surfaces. However, many details of robust implementations at the roll-to-roll scale remain an engineering challenge, including precise regulation of printing pressures and the stamp-substrate interaction. This paper introduces a method for precise control of contact pressure that can accommodate large dimensional variations, i.e. varying stamp and substrate thicknesses. This control algorithm is implemented on a simply supported roll positioning stage. Experimental results for microcontact printing and microflexography are shown both with in situ contact measurements on a pseudo substrate and with 5 um silver nanoparticle prints. Ultimately, this approach enables robust printing despite sensitive stamp patterns and large dimensional variations (> 10 μm) in substrates, stamps, and roll equipment.

Large Area Microcontact Printing Presses for Plastic Electronics

2004 ◽  
Vol 846 ◽  
Author(s):  
Hee Hyun Lee ◽  
Etienne Menard ◽  
Nancy G. Tassi ◽  
John A. Rogers ◽  
Graciela B. Blanchet
Keyword(s):  
High Resolution ◽  
High Speed ◽  
Microcontact Printing ◽  
Low Cost ◽  
Manufacturing Processes ◽  
Flexible Substrates ◽  
Large Area ◽  
Plastic Electronics ◽  
Roll To Roll ◽  
Micron Size

ABSTRACTLow cost fabrication is key to the successful introduction of organic electronics and roll to roll manufacturing processes. We propose here that extending flexography into the micron size resolution regime may provide an economical commercialization path for plastic devices. Flexography is a high-speed technique commonly used for printing onto very large area flexible substrates.[1] Although low resolution and poor registration are characteristics of today's flexographic process, it has many similarities with soft lithographic techniques. This work shows that large, (12”×12”) high-resolution printing plates appropriate for use on small tag and label flexographic presses can be prepared using simple and inexpensive flexographic compatible processes. We illustrate the use of these plates for three representative soft lithographic processes: microcontact printing, replica molding, and phase shift lithography.

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.

Flexible, conjugated polymer-fullerene-based bulk-heterojunction solar cells: Basics, encapsulation, and integration

2005 ◽  
Vol 20 (12) ◽  
pp. 3224-3233 ◽  
Author(s):  
G. Dennler ◽  
C. Lungenschmied ◽  
H. Neugebauer ◽  
N.S. Sariciftci ◽  
A. Labouret
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
High Speed ◽  
Large Scale ◽  
Bulk Heterojunction ◽  
Low Cost ◽  
Gas Barrier ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Roll To Roll

Organic solar cells based on conjugated polymer:fullerene blends show nowadays efficiencies above 4%. After briefly presenting the science of bulk-heterojunction solar cells, we report herein a shelf lifetime study performed by encapsulating the cells in a flexible and transparent gas barrier material. This method allows lifetimes as reported for glass encapsulation. Moreover, we propose a new approach to pattern organic solar cells and design large-scale modules. This technique, based on selective Nd:yttrium aluminum garnet (YAG) laser etching, potentially enables low-cost, high-speed roll-to-roll operation.

Drop Test for Electroless Nickel Electroless Palladium Immersion Gold (ENEPIG) Surface Treatment Application That is Suitable to a Low-Cost, Fine Pitch and Easy Fabrication

2009 ◽  
Author(s):  
Junehyeon Ahn ◽  
Hongkwon Kim ◽  
Kangho Byun ◽  
Youngmin Lee ◽  
Donghoon Jang ◽  
...  
Keyword(s):  
Data Acquisition ◽  
Test Performance ◽  
High Speed ◽  
Low Cost ◽  
Electroless Nickel ◽  
Drop Test ◽  
In Situ Data ◽  
Fine Pitch ◽  
Device Reliability

For an application of fine pitch Ball Grid Array (BGA) or Land Grid Array (LGA) packages, ENEPIG is a promising surface finish technology of low cost, fine pitch and easy fabrication. In this paper, we study the drop test, one of the most important items of hand held device reliability test, of ENEPIG surface finished packages. This paper focuses on the drop test performance of a bond between the main board and three kinds of packages. Those packages are designed with a daisy chain for a detection of open/short during the drop test. The main board has a bar type outline and is suitable for an In-Situ data acquisition. Drop tester is composed of a drop test unit, a high speed resistance meter and a data acquisition system (PC). JEDEC Condition B (1,500G and 0.5milliseconds duration time and half-sine pulse) in JESD22-B111 Table 1 or in JESD22-B104-C Table 1 is applied as a test condition. After the drop test, the joint geometry and the intermetallic compound (IMC) of failure samples are analyzed through the cross section method. The result shows no breaks at the solder joint of package side. All breaks, however, are originated from the solder joints of main board side. It is a significant outcome of this work to show no performance difference between ENEPIG and Electrolytic Ni/Au.

scholarly journals Enabling Image-Based Streamflow Monitoring at the Edge

2020 ◽  
Vol 12 (12) ◽  
pp. 2047 ◽  
Author(s):  
Fabio Tosi ◽  
Matteo Rocca ◽  
Filippo Aleotti ◽  
Matteo Poggi ◽  
Stefano Mattoccia ◽  
...  
Keyword(s):  
Embedded System ◽  
High Speed ◽  
Low Cost ◽  
Cost Effective ◽  
Engineering Practice ◽  
Embedded Devices ◽  
Cloud Processing ◽  
Internet Connections ◽  
Processing Device

Monitoring streamflow velocity is of paramount importance for water resources management and in engineering practice. To this aim, image-based approaches have proved to be reliable systems to non-intrusively monitor water bodies in remote places at variable flow regimes. Nonetheless, to tackle their computational and energy requirements, offload processing and high-speed internet connections in the monitored environments, which are often difficult to access, is mandatory hence limiting the effective deployment of such techniques in several relevant circumstances. In this paper, we advance and simplify streamflow velocity monitoring by directly processing the image stream in situ with a low-power embedded system. By leveraging its standard parallel processing capability and exploiting functional simplifications, we achieve an accuracy comparable to state-of-the-art algorithms that typically require expensive computing devices and infrastructures. The advantage of monitoring streamflow velocity in situ with a lightweight and cost-effective embedded processing device is threefold. First, it circumvents the need for wideband internet connections, which are expensive and impractical in remote environments. Second, it massively reduces the overall energy consumption, bandwidth and deployment cost. Third, when monitoring more than one river section, processing “at the very edge” of the system efficiency improves scalability by a large margin, compared to offload solutions based on remote or cloud processing. Therefore, enabling streamflow velocity monitoring in situ with low-cost embedded devices would foster the widespread diffusion of gauge cameras even in developing countries where appropriate infrastructure might be not available or too expensive.

Thiophene Oligomer and NTCDI Semiconductors with High Field-effect Transistor On/off Ratios

2001 ◽  
Vol 665 ◽  
Author(s):  
Howard E. Katz ◽  
Andrew J. Lovinger ◽  
X. Michael Hong ◽  
Jerainne Johnson
Keyword(s):  
Organic Semiconductors ◽  
Field Effect ◽  
High Speed ◽  
Microcontact Printing ◽  
Field Effect Transistors ◽  
Low Cost ◽  
Aspect Ratios ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
Ambipolar Transport

Organic semiconductors are of continued interest for low-cost display drivers and logic elements. Field-effect transistors (FETs) with organic semiconductor channels have been fabricated in arrays to drive electrophoretic display pixels[1] and polymer dispersed liquid crystals (http://www.research.philips.com/pressmedia/releases/000901a.html). Complementary logic elements and shift registers containing hundreds of organic-based FETs have been produced[2], and high-speed organic circuits have been fabricated on polyester substrates.[3] The source and drain electrodes of individual FETs have been patterned using microcontact printing and inkjet methods[4] to give extraordinary aspect ratios. Inorganic[5] and hybrid[6] materials have been deposited as FET semiconductors using the methods of “organic electronics”. Organic FET channels have been harnessed to demonstrate ambipolar transport[7], chemical sensitivity[8], superconductivity[9], and electrically pumped lasers[10].

scholarly journals One-step fabrication of high refractive index inorganic nanostructures

2021 ◽  
Author(s):  
E. Zanchetta ◽  
G. Della Giustina ◽  
A. Gandin ◽  
V. Auzelyte ◽  
G. Brusatin
Keyword(s):  
Refractive Index ◽  
Nanoimprint Lithography ◽  
Low Cost ◽  
Sol Gel ◽  
Uv Curing ◽  
High Refractive Index ◽  
Planar Waveguides ◽  
Ex Situ ◽  
Antireflective Coatings

AbstractDirect printing of spin-on functional films is probably the most efficient method to develop low-cost novel photonic nanodevices, such as diffraction gratings, planar waveguides, nano- lasers, and antireflective coatings. For these applications high refractive index transparent materials are demanded; however, this class of materials generally requires inorganic oxides, well known for their hardness, typical of ceramic materials, and so incompatible with a soft character of printable resins. Herein, inorganic high refractive index TiO2 micro- and nano- structures, with unusual depth up to 600 nm and aspect ratio larger than 5, are obtained by combining thermal nanoimprint lithography (NIL) with UV curing. To achieve printed patterns, a hybrid organic-inorganic spin-on film is deposited at low-temperature by sol–gel processing. Two distinct bottom-up synthetic approaches are used, called in situ and ex situ, using titanium isopropoxide (90%) or TiO2 anatase nanoparticles (70%), respectively, and adding a silica sol modified by organic moieties. The two syntheses were optimized to obtain, after patterning by thermal imprint, amorphous or crystalline titania crack-free micro- and nano- patterns for in situ and ex situ, respectively. The further UV irradiation converts imprinted films to totally inorganic patterns, through the titania photocatalytic effect, allowing refractive indexes up to 1.82 at 632 nm to be achieved. This novel strategy of combining thermal imprint with UV exposure allows inorganic deep patterns to be fabricated without a calcination step, which is generally needed for inorganic resists processing. Eventually, a thermal treatment only at 300 °C can be applied to achieve a final refractive index of 2 at 632 nm.

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