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Keranen K.,VTT Technical Research Center of Finland | Jaakola T.,VTT Technical Research Center of Finland | Korhonen P.,VTT Technical Research Center of Finland | Antonipieri M.,Centro Ricerche Plast Optica SpA | And 6 more authors.
2012 4th Electronic System-Integration Technology Conference, ESTC 2012 | Year: 2012

Autonomous systems are pursued in automotive and signage applications due to easy installation and achieved energy savings. In addition, reduction of cabling decreases system weight, which is especially pursued in automotive applications due to the decreased fuel consumption. Naturally, autonomous systems require some kind of energy harvesting and energy storing systems. In order to achieve required autonomy operation time of over 15 hours, four flexible Li-Ion batteries of 1200 mAh total capacity in automotive demonstrator and four flexible Li-Ion batteries of 3200 mAh total capacity in signage demonstrator were required. The dimensions of batteries were 295 mm × 29 mm and 295 mm × 119 mm. The energy harvesting for autonomous operation was based on flexible commercially available amorphous silicon solar cells, types MP3-25 and MPT6-150 manufactured by Power Film. The dimensions of the solar cells were 114 mm × 29 mm and 114 mm × 150 mm. The pursued autonomy time of demonstrators resulted to a large surface area requirement for the backplane substrates. The dimensions of the assembled automotive demonstrator were 2400 mm × 35 mm × 0.95 mm and the dimensions of the assembled signage demonstrator were 2550 mm × 144 mm × 0.95 mm. The large size of both the components and the substrates produced challenges for assembly and bonding processes. As the bonding method hot bar bonding or oven curing were used, the experimental procedure being compatible with the guidelines of the material suppliers. Daisy chain test structures were used to study the interconnections between the foils. Thermal humidity testing at 85°C/85%RH and thermal cycling between -40⋯+85°C were used as the environmental tests for the test structures processed before final selection of the bonding materials and processes for demonstrators manufacturing. Both manufactured demonstrators were operational after assembly and bonding processes. The energy produced by the solar cells was guided to the Li-Ion batteries by a specific charge regulator. Batteries were able to supply power to the automotive and signage LED elements so that the systems autonomous operation was successfully demonstrated.

Padovani S.,Centro Ricerche Plast Optica SpA | Sinesi S.,Centro Ricerche Plast Optica SpA | Priante S.,Centro Ricerche Plast Optica SpA | Antonipieri M.,Centro Ricerche Plast Optica SpA | And 4 more authors.
Electronics System Integration Technology Conference, ESTC 2010 - Proceedings | Year: 2010

A new method to fabricate transparent head-up display on glass has been developed. The method exploits the integration of the Aerosol Jet® Process in the Chip On Board technology. The Aerosol Jet® Process is an additive process, which allows the deposition of a wide variety of materials onto a wide variety of substrates without conventional masks or thin-film equipment, but driven by a CAD file (see, e.g. [1]). The process uses aerodynamic focusing to precisely and accurately deposit nano dispersions, so called "functional inks". The process has been used for the printing of thin conductive layout on glass with Agnanoparticle based conductive inks. After layout deposition, the chip-LED has been mounted on the glass by means of flip chip process exploiting micro-stamping technique. The developed displays have a luminance higher than 10000 cd/m2 and the visibility trough the glass substrate is fulfills requirements to guarantee the application also on windshield in automotive field [2].

Dai Pre M.,University of Padua | Morrow I.,University of Queensland | Martin D.J.,University of Queensland | Mos M.,Centro Ricerche Plast Optica SpA | And 3 more authors.
Materials Chemistry and Physics | Year: 2013

A stable and narrowly distributed dispersion of Mn-doped ZnS nanoparticles with an average diameter of 3 nm, has been synthesized via chemical precipitation without using any surfactant. The surface of the particles has been functionalized with acrylic acid for compatibilization with PMMA. Transparent luminescent nanocomposite powder was obtained using solvent polymerization of ZnS:Mn nanoparticles in a mixture of methyl methacrylate and acrylic acid. Nanocomposites produced by effectively processing this powder into pure PMMA demonstrated "down shifting" performance. The nanocomposite plaques produced were shown to improve the efficiency of a silicon solar cell. © 2013 Elsevier B.V. All rights reserved.

Padovani S.,Centro Ricerche Plast Optica SpA | Del Negro A.,Centro Ricerche Plast Optica SpA | Antonipieri M.,Centro Ricerche Plast Optica SpA | Sinesi S.,Centro Ricerche Plast Optica SpA | And 4 more authors.
Microelectronics Reliability | Year: 2010

Today, the III-V compound semiconductor solar cells represent the most promising photovoltaic technology to achieve the grid parity, thanks to their proven capability to work at high concentration factors (H-CPV: high concentration photovoltaics) with demonstrated conversion efficiencies higher than 40% in the spectral conditions typical of the Earth surface (AM1.5D). One of the issues to be investigated in the H-CPV systems is the reliability of the solar cell receivers. In fact in concentration conditions the thermal and mechanical stress on the solar cell, mounted on receivers, is very significant with respect to flat panel technology. This paper proposes a method, typically used in the LED industry, to test, in accelerated conditions, the H-CPV solar receivers. The receivers, based on III-V solar cells, size 2.1 × 2.1 mm2 from CESI, were built by chip on board technology at CRP labs, and characterized for 800 h to simulate 20 years of in-field operation in concentration regime (500×). © 2010 Elsevier Ltd. All rights reserved.

Marcori F.,Centro Ricerche Plast Optica SpA | Antonipieri M.,Centro Ricerche Plast Optica SpA | Di Vora I.,Centro Ricerche Plast Optica SpA | Padovani S.,Centro Ricerche Plast Optica SpA | Riolino I.,Centro Ricerche Plast Optica SpA
Advanced Materials Research | Year: 2014

The production of Molded Interconnect Devices (MIDs) may be achieved through different processes. In this work Centro Ricerche Plast-optica (CRP) has chosen to evaluate, implement and assess Laser Direct Structuring (LDS) and In Mold Labeling (IML) technologies for the production of MIDs. Both alternative methods have been analyzed starting with a 2D component, mainly used for implementation and optimization of the process, and finally a more complex 3D component, that has been designed and produced. The first phase of the activity regards the production of several conductor patterns on planar substrates dedicated to evaluate properties as conductors resistance, adhesion, SMD components solderability, wire bondability of bare LED dice etc. In the case of IML, a flexible circuit has been over-molded during the production of the component by injection molding process: planar parts have been tested also in terms of adhesion of flexible circuit to the injected polymer. The second phase of the activity concerns the production of 3D circuits. Both technologies have been implemented in order to select to materials, process conditions and parameters, design rules and to verify the reliability in the automotive severe conditions. Exploitation of technologies have been performed on an automotive rear lamp. A prototype has been produced in LDS technology and allowed to define the conditions that make economically affordable this solution. Differently, the IML technology allowed to produce a completely new device by embedding a planar electronic circuits into the plastic material. © (2014) Trans Tech Publications, Switzerland.

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