Large area electronics

NANOMOL is highly involved in the field of large area organic electronics (OLAE) which is raising great interest due to the potential that organic materials offer to fabricate low-cost and flexible devices. We are engrossed not only in gaining an insight into fundamental aspects that take place in these materials, but also with the view of developing novel practical devices. In particular, we are currently engaged in the development of organic field-effect transistors (OFETs) and organic strain sensors.

Organic Field-Effect Transistors (OFETs)

ofetField-effect transistors are the main logic units in electronic circuits, where they usually function as either a switch or an amplifier. In the group we are working with thin-films and single crystals of organic semiconductors to fabricate OFETs. Our work ranges from the design of novel organic semiconductors for specific applications to the device fabrication and electrical characterisation. Within this research area, we are interested in performing correlation studies between crystal structure and device performance, understanding the interfaces with the organic semiconductor and fabricating low-cost solution-processed devices. In the last few years, large efforts have been also placed on the processing of organic semiconductors to prepare large area crystalline films for practical device implementation. Further, currently we are working on developing an OFET platform for sensing applications.

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For recent representative publications on this topic see:

  • R. Pfattner, M. Mas-Torrent, I. Bilotti, A. Brillante, S. Milita, F. Liscio, F. Biscarini, T. Marszalek, J. Ulanski, A. Nosal, M. Gazicki-Lipman, M. Leufgen, G. Schmidt, L. W. Molenkamp, V. Laukhin, J. Veciana, C. Rovira, Adv. Mater. 2010 22, 4198.
  • F. Otón, R. Pfattner, E. Pavlica, Y. Olivier, E. Moreno, J. Puigdollers, G. Bratina, J. Cornil, X. Fontrodona, M. Mas-Torrent, J. Veciana, C. Rovira,  Chem. Mater. 2011, 23, 851.
  • R. Pfattner, M. Mas-Torrent, C. Moreno, J. Puigdollers, R. Alcubilla, I. Bilotti, E. Venuti, A. Brillante, V. Laukhin, J. Veciana, C. Rovira,  J. Mater. Chem. 2012, 22, 16011.
  • R. Pfattner, C. Moreno, C. Voz, R. Alcubilla, C. Rovira, J. Puigdollers, M. Mas-Torrent, Org. Electronics, 2014,15, 211-215.
  • Y. Geng, R. Pfattner, A. Campos, W. Wang, O. Jeannin, J. Hauser, J. Puigdollers, S. T. Bromley, S. Decurtins, J. Veciana, C. Rovira, M. Mas-Torrent, Shi-Xia Liu, Chem. Eur. J. 2014, 20, 16672-16679.
  • F. G. del Pozo , S. Fabiano , R. Pfattner , S. Georgakopoulos, S. Galindo , X. Liu , S. Braun , M. Fahlman , J. Veciana, C. Rovira , X. Crispin , M. Berggren, M. Mas-Torrent, Adv. Funct. Mater. 2015, DOI: 10.1002/adfm.201502274

Organic Strain Sensors

The development of intelligent materials that can respond to the application of an external stimulus is of major interest for the fabrication of artificial sensing devices able to sense and transmit information about the physical, chemical and/or biological changes produced in our environment. We recently reported on the extremely sensitive sensing properties of bi-layer (BL) films based on a polymeric matrix containing a conducting top-layer of a microcrystalline network of a conducting charge transfer organic salt. Some of such composite BL films exhibited a fast and fully reversible response to strain reaching gauge factor values of 10–20 that are one order of magnitude higher than the most commonly used manganese-based electromechanical sensors. Some other BL-films with pryroresistive components are extremely sensitivity to temperature changes and to sources emitting infrared radiation and thereby they can be used for direct-contact temperature measurements and as contact-less temperature (or radiant-heat) sensors –as a bolometer.

We have also worked on the integration of such smart materials in human wearable interfaces such as fabrics, since wearable electronics could offer personalized healthcare, security and comfort.

organicSensors

For relevant recent publications on this topic see:

  • E. Laukhina, R. Pfattner, L. R. Ferreras, S. Galli, M. Mas-Torrent, N. Masciocchi, V. Laukhin, C. Rovira, J. Veciana,  Adv. Mater. 2010, 22, 977.
  • R. Pfattner, V. Lebedev, B. Moradi, E. Laukhina, V. Laukhin, C. Rovira, J. Veciana, Sensors & Transducers, 2013, 18, 128-133.
  • V. Lebedev, E. Laukhina, E. Moreno-Calvo, C. Rovira, V. Laukhin, I. Ivanov, S.M. Dolotov, V.F. Traven, V.V. Chernyshev, J. Veciana, J. Mater. Chem. C, 2014, 2, 139-146.
  • V. Lebedev, E. Laukhina, V. Laukhin, C. Rovira, J. Veciana, Eur. J. Inorg. Chem., 2014, 3927-3932.
  • E. Steven, V. Lebedev, E. Laukhina, C. Rovira, V. Laukhin, J.S. Brooks, J. Veciana, Mater. Horiz., 2014, 1, 522-528.
  • R. Pfattner, V. Lebedev, E. Laukhina, S. Chaitanya Kumar, A. Esteban-Martin, V. Ramaiah-Badarla, M. Ebrahim-Zadeh, F. Pelayo García de Arquer, G. Konstantatos, V. Laukhin, C. Rovira, J. Veciana, Adv. Electron. Mater., 2015, DOI: 10.1002/aelm.201500090

 

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