Speaker
Mr
Álvaro Rodríguez Rodríguez
(Instituto de Estructura de la Materia IEM-CSIC)
Description
Conjugated polymers have been proposed for application in a wide variety of next generation technologies including displays, solid-state lighting, transistors and organic photovoltaic devices. In organic photovoltaics (OPVs), the dissociated free charges (electrons and holes) are generated at the interface between the donor (e-donor) and acceptor (e-acceptor) phases, and then transported to their respective electrodes, forming the external circuit. Therefore, increasing the interfacial area between the e-donor and e-acceptor phases and limiting the morphology of the heterojunction to the nanoscale are critical for improving the device performance [1].
In this work we will report on the laser induced periodic surface structures (LIPSS) in conjugated polymers such as poly-3-hexylthiophene (P3HT), poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3' benzothiadiazole)] (PCDTBT) and the blend P3HT/PCDTBT. The investigation of the thin films as well as the nanostructured films was performed by using different synchrotron techniques. The evolution of the polymer nanostructures was followed by in situ Grazing Incidence X-Ray Scattering (GISAXS and GIWAXS) [2]. The polymer blend was studied by Scanning Transmission X-Ray Microscopy (STXM) based on the Near Edge X-Ray Absorption Fine Structure (NEXAFS) spectra of the two polymers P3HT and PCDTBT. By this technique it is possible to obtain the compositional maps of the blend P3HT/PCDTBT before and after irradiation. In both cases the results reveal a phase separation of the two polymers. In addition a synergy in the LIPSS formation was found for the polymer blend. The structure-properties relationship was investigated by conductive AFM [3].
Acknowledgements: The authors thank the financial support from the MINECO (grants MAT2011-23455 and CTQ 2013-43086-P ), Spain. A.R-R and E.R, thank MINECO, Spain for the tenure of a FPI contract (MAT2012-33517) and a Ramón y Cajal contract (RYC-2011-08069) respectively.
References
[1] C.R. McNeill, N.C. Greenham, Adv. Mater. 21, 3840 (2009).
[2] E. Rebollar, D.R. Rueda, I. Martín-Fabiani , Á. Rodríguez-Rodríguez, M-C. García-Gutiérrez, G. Portale, M.Castillejo, T.A. Ezquerra, Langmuir, 31 (13), 3973 (2015).
[3] Á. Rodríguez-Rodríguez, E. Rebollar, M. Soccio, T.A. Ezquerra1, D. R. Rueda, J. V Garcia-Ramos, M. Castillejo. M-C. Garcia-Gutiérrez, submitted to Macromolecules
| Caption (s) - Add figures as attached files (2 fig. max) | Figure 1. (up) in situ GISAXS patterns of PCDTBT thin films irradiated at 532 nm using a fluence of 26 mJ/cm2 for different number of pulses, (down) STXM images of the P3HT/PCDTBT blend before and after irradiation. |
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Primary author
Mr
Álvaro Rodríguez Rodríguez
(Instituto de Estructura de la Materia IEM-CSIC)
Co-authors
Dr
Daniel Rueda
(Instituto de Estructura de la Materia IEM-CSIC)
Dr
Esther Rebollar
(Instituto Quimica-Fisica Rocasolano, IQFR-CSIC)
Dr
Mari Cruz García-Gutiérrez
(Instituto de Estructura de la Materia, IEM-CSIC)
Prof.
Marta Castillejo
(Instituto Quimica-Fisica Rocasolano, IQFR-CSIC)
Dr
Michela Soccio
(Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali, Via Terracini 28, 40131 Bologna)
Prof.
Tiberio Ezquerra
(Instituto de Estructura de la Materia, IEM-CSIC)
