Dresden 2014 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: Poster Session 1 (joint session with BP)

CPP 19.26: Poster

Tuesday, April 1, 2014, 09:30–13:00, P1

Novel structuring of organic thin films for improved absorption and performance in organic solar cells — •Johannes Schlipf, Claudia Palumbiny, and Peter Müller-Buschbaum — TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching

Organic solar cells (OSC) have recently broken the 10% efficiency barrier hence they will soon become competitive with their inorganic counterparts. In addition, OSC still have huge advantages over (the commonly used) silicon solar cells, e.g. low production costs, possible fabrication on flexible substrates, as well as their good performance under diffuse and indirect light. The latter two are addressed in this work. Nano-imprint lithography is used to form novel, artificially structured organic thin films of high aspect ratio. Applying this structure in a solar cell provokes enhanced light scattering and induced light trapping in the photo-active layer for an overall better absorption particularly under oblique incident light. Furthermore, the conductivity of the commonly used PEDOT:PSS is improved by a combination of previously established methods: the addition of a fluorosurfactant (Zonyl FS-300)[1] and subsequent post-treatment with ethylene glycol [2, 3]. Thus PEDOT:PSS becomes applicable as a stand-alone transparent electrode. In total, this provides the possibility for high-performance, flexible and ITO-free devices based on already well-established materials in the field of organic electronics. [1] Vosguerichtian et al., Adv. Funct. Mater. 2012, 22, 421-428; [2] Kim et al., Adv. Funct. Mater. 2011, 21, 1076-1081; [3] Palumbiny et al. (submitted)