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Schmidt W.,Schoeller Technocell GmbH and Co. KG
Coating International | Year: 2015

Schoeller Technocell employs various coating technologies to meet the different challenges for substrates for printed electronics. The ductile barrier coating with simultaneous oxygen and water vapor barrier will be realized experimentally by a multi-layer approach. For the moisture barrier, hydrophobic polymers like waxes will be tested. The oxygen barrier will be created by the second layer. Tensile properties of both the multilayer film will be modified using inorganic fillers. Both the tuning of ductility and barrier functionality will be evaluated by establishing an experimental matrix.


Aguas H.,New University of Lisbon | Mateus T.,New University of Lisbon | Vicente A.,New University of Lisbon | Gaspar D.,New University of Lisbon | And 5 more authors.
Advanced Functional Materials | Year: 2015

The present development of non-wafer-based photovoltaics (PV) allows supporting thin film solar cells on a wide variety of low-cost recyclable and flexible substrates such as paper, thereby extending PV to a broad range of consumer-oriented disposable applications where autonomous energy harvesting is a bottleneck issue. However, their fibrous structure makes it challenging to fabricate good-performing inorganic PV devices on such substrates. The advances presented here demonstrate the viability of fabricating thin film silicon PV cells on paper coated with a hydrophilic mesoporous layer. Such layer can not only withstand the cells production temperature (150 C), but also provide adequate paper sealing and surface finishing for the cell's layers deposition. The substances released from the paper substrate are continuously monitored during the cell deposition by mass spectrometry, which allows adapting the procedures to mitigate any contamination from the substrate. In this way, a proof-of-concept solar cell with 3.4% cell efficiency (41% fill factor, 0.82 V open-circuit voltage and 10.2 mA cm-2 short-circuit current density) is attained, opening the door to the use of paper as a reliable substrate to fabricate inorganic PV cells for a plethora of indoor applications with tremendous impact in multi-sectorial fields such as food, pharmacy and security. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ohlund T.,Mid Sweden University | Schuppert A.,Schoeller Technocell GmbH and Co. KG | Schuppert A.,Charles Gerhardt Institute | Andres B.,Mid Sweden University | And 7 more authors.
RSC Advances | Year: 2015

Inkjet-printed metal films are important within the emerging field of printed electronics. For large-scale manufacturing, low-cost flexible substrates and low temperature sintering is desired. Tailored coated substrates are interesting for roll-to-roll fabrication of printed electronics, since a suitable tailoring of the ink-substrate system may reduce, or remove, the need for explicit sintering. Here we utilize specially designed coated papers, containing chloride as an active sintering agent. The built-in sintering agent greatly assists lowerature sintering of inkjet-printed AgNP films. Further, we examine the effect of variations in coating pore size and precoating type. Interestingly, we find that the sintering is substantially affected by these parameters. © 2015 Royal Society of Chemistry.


Andersson H.,Mid Sweden University | Manuilskiy A.,Mid Sweden University | Lidenmark C.,Mid Sweden University | Gao J.,Mid Sweden University | And 5 more authors.
Nanotechnology | Year: 2013

The resistance of inkjet printed lines using a silver nanoparticle based ink can be very dependent on the substrate. A very large difference in resistivity was observed for tracks printed on paper substrates with aluminum oxide based coatings compared to silica based coatings. Silica based coatings are often cationized with polymers using chloride as a counter ion. It is suggested that the precipitation of silver salts is the cause of the high resistivity, since papers pretreated with salt solutions containing ions that precipitate silver salts gave a high resistance. Silver nitrate has a high solubility and paper pretreated with nitrate ions gave a low resistivity without sintering. The results obtained show that, by choosing the correct type of paper substrate, it is possible to manufacture printed structures, such as interconnects on paper, without the need for, or at least to reduce the need for, post-print sintering. This phenomenon is, of course, ink specific. Inks without or with a low silver ion content are not expected to behave in this manner. In some sensor applications, a high resistivity is desired and, by using the correct combination of ink and paper, these types of sensors can be facilitated. © 2013 IOP Publishing Ltd.

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