Cetemmsa Technological Center

Mataró, Spain

Cetemmsa Technological Center

Mataró, Spain
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Burgues-Ceballos I.,CSIC - Institute of Materials Science | Burgues-Ceballos I.,Cetemmsa Technological Center | Kehagias N.,Catalan Institute of Nanoscience and Nanotechnology | Sotomayor-Torres C.M.,Catalan Institute of Nanoscience and Nanotechnology | And 3 more authors.
Solar Energy Materials and Solar Cells | Year: 2014

We combine inkjet printed silver grids and reverse nanoimprinting transfer to demonstrate front electrode structures embedded within the substrate for indium tin oxide (ITO) replacement in organic solar cells. The smooth interface between Ag grid and transparent semiconductor polymer PEDOT:PSS improves the topology of the successive layers. In turn, this results in overall good photovoltaic performance including high fill factor and no shunting. By modelling the shadowing and resistive losses as a function of the separation between grid lines, the optimal grid structure is identified, which we then confirm experimentally. Inkjet printed ITO-free solar cells showed slightly higher performance than the ITO based reference. © 2014 Elsevier B.V.

Burgues-Ceballos I.,Friedrich - Alexander - University, Erlangen - Nuremberg | Burgues-Ceballos I.,Cetemmsa Technological Center | Burgues-Ceballos I.,CSIC - Institute of Materials Science | Machui F.,Friedrich - Alexander - University, Erlangen - Nuremberg | And 9 more authors.
Advanced Functional Materials | Year: 2014

Replacing halogenated solvents in the processing of organic solar cells by green solvents is a required step before the commercialization of this technology. With this purpose, some attempts have been made, although a general method is yet to be developed. Here, the potential of the Hansen solubility parameters (HSP) analysis for the design of green ink formulations for solution-processed active layer in bulk heterojunction photovoltaic devices based on small molecules is demonstrated. The motivation of moving towards organic small molecules stems from their lower molecular weight and more definite structure which makes them more likely to be dissolved in a wider variety of organic solvents. In the first step, the HSP of selected active materials are determined, namely, the star-shaped D-π-A tris{4-[5″-(1, 1-dicyanobut-1-en-2-yl)-2,2′-bithiophen-5-yl]phenyl}amine N(Ph-2T-DCN-Et)3 small molecule and fullerene derivative [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM). Secondly, computer simulations based on HSP allow the prediction of suitable green solvents for this specific material system. The most promising green solvents, according to the simulations, are then used to fabricate solar cell devices using pristine solvents and two solvents mixtures. These devices show power conversion efficiencies around 3.6%, which are comparable to those obtained with halogenated solvents. This good performance is a result of the sufficient solubility achieved after a successful prediction of good (green) solvents. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Machui F.,Bavarian Center for Applied Energy Research | Maisch P.,Bavarian Center for Applied Energy Research | Burgues-Ceballos I.,Cetemmsa Technological Center | Langner S.,Friedrich - Alexander - University, Erlangen - Nuremberg | And 4 more authors.
ChemPhysChem | Year: 2015

The use of additives to improve the performance of organic photovoltaic cells has been intensely researched in recent years. However, so far, no system has been reported for the classification of additives and their functions. In this report, a system for classifying additives according to the fundamental mechanism by which they influence microstructure formation for P3HT:PCBM is suggested. The major parameters used for their classification are solubility and drying kinetics. Both are discussed in detail and their consequences on processing are analyzed. Furthermore, a general mechanism to classify the impact of additives on structure formation is suggested and discussed for different materials relevant to organic photovoltaic devices. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Lagunar C.M.,ATOS | Barca C.C.,ATOS | Quintero Padron A.M.,ATOS | Planes X.,CIBER ISCIII | And 10 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2012

The Ubiquitous Tele-monitoring Kit (UTK) is aimed at helping the clinician in acquiring, managing and normalizing information coming from the patients at home and storing the data in a distributed system. This approach aims to reduce costs in the healthcare system and alleviate the inherent problems to chronic patients who usually may visit the doctors. The proposed system closes the tele-monitoring loop; wearable and ergonomic sensors integrated in the textile, automatic detection and storage of the information coming from the sensors in a common platform (XNAT) and processing and visualization of the retrieved physiological signals presenting the data treated to the clinician to optimize the continuum of care and the decision-making. © 2012 Springer-Verlag.

Burgues-Ceballos I.,CSIC - Institute of Materials Science | Burgues-Ceballos I.,Cetemmsa Technological Center | Campoy-Quiles M.,CSIC - Institute of Materials Science | Francesch L.,Cetemmsa Technological Center | Lacharmoise P.D.,Cetemmsa Technological Center
Journal of Polymer Science, Part B: Polymer Physics | Year: 2012

The viability of vapor printing as a fast annealing treatment for the processing of polymer solar cells is demonstrated. In this method, a carrier gas transporting vapor solvent is delivered through a nozzle promoting self-assembly of polymer chains. Devices based on poly(3-hexylthiophene) blended with soluble fullerene are locally exposed during different annealing times to chlorobenzene vapor in a nitrogen flow. This enables finding an optimal nanostructure in promisingly short time-scales (<5 s of exposure to vapor solvent), which yields a twofold increase in efficiency with respect to as-cast samples. Moreover, a combined Raman, photometric, and ellipsometric characterization allows to understand why overexposure to vapor solvent reduces the performance. Finally, toluene and 1,2,3,4-tetrahydronaphthalene are also tested using this method, showing different printing efficiencies corresponding to their specific vapor pressures. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012 Solvent vapor annealing of the active layer in polymer solar cells improves device efficiencies. Here, vapor printing is used as a fast annealing treatment (<5 seconds). Poly(3-hexylthiophene):fullerene- based devices are exposed to solvent vapor in a nitrogen flow through a nozzle, allowing local application. Three different regimes of structural properties and photovoltaic performance evolution are identified upon annealing, and up to a twofold increase in efficiencies is shown in comparison to as-cast devices. Copyright © 2012 Wiley Periodicals, Inc.

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