Continuous Double-Sided Roll-to-Roll Imprinting of Polymer Film

Mäkelä, Tapio; Haatainen, Tomi; Majander, Päivi; Ahopelto, Jouni; Lambertini, V.

doi:10.1143/jjap.47.5142

Cited by 70 publications

(36 citation statements)

References 5 publications

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“…Electrochemically deposited nickel and poly-dimethyl siloxane (PDMS) are employed as intermediate molds in HEL and UV-NIL, respectively. Moreover, both techniques are easily scalable to large areas and can be implemented in roll to roll systems [9,10]. UV-NIL avoids possible thermal limitations imposed by the substrate and requires less time and lower pressure ( $1 bar) to obtain high quality replicas than hot embossing.…”

Section: Introductionmentioning

confidence: 99%

High fidelity transfer of nanometric random textures by UV embossing for thin film solar cells applications

Escarré

Söderström

Battaglia

et al. 2011

Solar Energy Materials and Solar Cells

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a b s t r a c tWe investigate the transfer of random nanostructures commonly used in thin film silicon solar cells onto inexpensive substrates, such as glass or flexible polyethylene sheets. Morphological and optical analyses of masters and replicas show the successful transfer of details with sizes much below 1 mm. These highquality replicas are obtained by UV nano-imprinting, avoiding the use of PDMS as an intermediate mold, which has been identified as being responsible for the lack of resolution found in previous works.

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Section: Introductionmentioning

confidence: 99%

High fidelity transfer of nanometric random textures by UV embossing for thin film solar cells applications

Escarré

Söderström

Battaglia

et al. 2011

Solar Energy Materials and Solar Cells

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“…The surface roughness was found to be quite low (R a < 0.1 m). Furthermore, as has been shown in previous work [36], the aspect ratio, and not the resolution, can be seen as the limiting factor for replication when sub-100 nm structures have to be embossed. However, due to structure degradation, careful setting of parameters is needed to keep structural loss below tolerances, e.g., the use of flexible mould made using silicon master has solved part of the problem.…”

Section: Effects Of Roller Pressurementioning

confidence: 59%

Roll manufacturing of polymer microfluidic devices using a roll embossing process

Zhang

Sahli

Gelin

et al. 2015

Sensors and Actuators A: Physical

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a b s t r a c tThe replication of micro-fluidic devices is increasingly utilised in various industrial fields, such as medicine and cell biology research, and in many applications: drug screening, sugar testers, chemical microreactors, microprocessor cooling (just reward) and micro fuel cells. The roll embossing process (R2R) is an efficient and economical method for fabricating micro/meso-features on the large-area surface of the polymer parts. In this work, we describe a roll embossing process for manufacturing micro-fluidic devices in different commercially available thermoplastic polymer using a micro-structured elastomeric pattern with low roughness (R a < 50 nm) as a roller stamping tool. This work investigates the effect of processing parameters on material performance for manufacturing the micro-fluidic devices via a roll embossing process. They describes observations and surface topography analyses made to compare the replication quality of polymeric replicas obtained by filling micro-cavities using the roll embossing process.The results indicate that the variation in flow behaviour of polymer surface during roll embossing process is highly dependent on the forming temperature and rheological of polymer. In addition, the features of the elastomeric mould were replicated with good fidelity, retaining the original dimensions. By careful adjustment of process parameters, a micro-fluidic circuit with details in the range of m was successfully transferred onto different polymeric films.

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“…Standard stamps for a roll-to-roll process are made from Ni [13], where the flexibility is controlled by the foil thickness obtained in a galvanic process [14]. In addition, two-layer stamps have been demonstrated for roll processing and planar processing as well.…”

Section: Introductionmentioning

confidence: 99%

Single-layer versus two-layer stamps for reduced pressure thermal nanoimprint

et al. 2015

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Low-pressure imprint is interesting to avoid stamp deformation, stamp failure as well as polymer recovery. When large-area stamps are prepared with a stepping procedure, low pressure is required to optimize the stitching. However, with low-pressure imprint, conformal contact between stamp and substrate is critical. Admittedly, the imprint pressure required for conformal contact depends on the stamp material and its thickness. To get an idea to which extent the imprint pressure can be reduced with a flexible stamp, we compared different stamp materials and stamp architectures, single-layer stamps and two-layer stamps. The two-layer stamps are replica stamps, where the structures were replicated in a thin layer of OrmoStamp, fixed by a backplane. On the background of plate theory, we deduce the pressure reduction compared to a Si stamp by calculating the respective pressure ratio, independent from geometries. In addition, temperature-induced issues are addressed which are of relevance for a thermal imprint process. These issues are related to the mismatch between the thermal expansion coefficients of the stamp and the substrate, and in case of a two-layer stamp, to the mismatch between the backplane material and the top layer. The latter results in temperatureinduced stamp bending. On the basis of simple analytical calculations, the potential of single-layer stamps and twolayer stamps with respect to thermal imprint at reduced pressure is discussed and guidelines are provided to assess the imprint situation when replica stamps are used for imprint. The results demonstrate the attractiveness of twolayer stamps for reduced pressure nanoimprint, even in a temperature-based process.

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Continuous Double-Sided Roll-to-Roll Imprinting of Polymer Film

Cited by 70 publications

References 5 publications

High fidelity transfer of nanometric random textures by UV embossing for thin film solar cells applications

High fidelity transfer of nanometric random textures by UV embossing for thin film solar cells applications

Roll manufacturing of polymer microfluidic devices using a roll embossing process

Single-layer versus two-layer stamps for reduced pressure thermal nanoimprint

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