Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Organic Electronics and Photovoltaics: Transport of Charges – from Molecules to Devices (jointly with CPP, HL)
TT 36.11: Vortrag
Dienstag, 17. März 2015, 12:15–12:30, C 130
Following the evolution of nanomorphology in PEDOT:PSS electrodes in-situ — •Claudia Palumbiny1, Feng Liu2, Thomas P. Russell2, Alexander Hexemer3, Cheng Wang3, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2University of Massachusetts Amherst, Department of Polymer Science and Engineering, 120 Governors Drive, Amherst, MA 01003, USA — 3Lawrence Berkeley National Lab, Advanced Light Source, 1 Cyclotron Road, Berkeley, CA 94720, USA
The strongest advantages of organic photovoltaics over classical semiconductors are the possibility of fully flexible devices and easy up-scaling, e.g. by slot-die printing. For fully printed and flexible devices there is a strong need for non-brittle and solvent processed electrodes, such as highly conductive PEDOT:PSS. Film properties are strongly correlated to the films nanomorphology and with this strongly depend on the processing technique used. We investigate the film evolution of highly conductive PEDOT:PSS in-situ during the printing process. We monitor the film evolution by in-situ grazing incident wide angle scattering (GIWAXS). Five film formation processes are detected, the crystallization of the polymers is correlated to solvent evaporation and enhanced interchain coupling is induced by the use of high boiling point co-solvents as ethylene glycol. The enhanced conductivity in co-solvent treated PEDOT:PSS films is related to enhanced interchain coupling, change of the PEDOT to PSS ratio and crystallite sizes.
[1] Palumbiny et al., J. Phys. Chem. C 2014, 118, 13598.