Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 31: Organic semiconductors II
CPP 31.3: Vortrag
Donnerstag, 29. März 2012, 10:15–10:30, C 130
Improved performance of organic photovoltaic cells processed on corrugated substrates structured with laser interference patterning — •Reinhard Scholz1, Lars Müller-Meskamp1, Yong Hyun Kim1, Simone Hofmann1, Karl Leo1, Sebastian Eckardt2, and Andrés Fabián Lasagni2 — 1Institut für Angewandte Photophysik, Technische Universität Dresden — 2Fraunhofer Institut für Werkstoff- und Strahltechnik, Dresden
Due to the short exciton diffusion length in organic semiconductors, bulk heterojunction solar cells consisting of donor-acceptor blends can help to improve the charge separation of the photocarriers. However, in the blends, problems in the formation of continuous percolation pathways towards the electrodes limit the total absorber thickness to rather low values, so that the photovoltaic cells would greatly benefit from an improved light management and an optical concentration in the absorber layer. We successfully use direct laser interference patterning (DLIP) to generate periodic surface structures on different types of substrates. DLIP uses high power laser pulses to ablate the target material directly, without need for classical lithography, resist, and transfer steps, allowing instead scalable structuring at reasonable costs and throughput. Comparing photovoltaic cells grown on corrugated substrates with reference cells grown on a flat surface of the same material, we obtain a relative enhancement of the power conversion efficiency by a factor of 1.21 [1].
[1] L. Müller-Meskamp, Y. H. Kim, T. Roch, S. Hofmann, R. Scholz, S. Eckardt, K. Leo and A. F. Lasagni, Adv. Mater. (2011) in press.