Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 45: Joint Poster Session
HL 45.6: Poster
Dienstag, 15. März 2011, 18:00–21:00, P1
Enhancement of the photocurrent in Diindenoperylene based organic photovoltaic cells — •A. Steindamm1, A.K. Topczak1, A. Riecke1, and J. Pflaum1, 2 — 1Inst. Exp. Phys. VI, Würzburg University, 97074 Würzburg — 2ZAE Bayern, 97074 Würzburg
The organic semiconductor Diindenoperylene (DIP) has shown its good potential as donor material for highly efficient organic photovoltaic cells (OPVCs). In combination with C60 as acceptor high open circuit voltages (VOC) of 0.9 eV and a high fill factor above 70 percent have been observed. The latter can be explained by the high crystallinity of DIP thin films leading to exciton diffusion lengths of up to 100 nm [1], resulting in a high charge collection efficiency. One challenge in DIP based OPVCs is the comparably low photocurrent, which is mainly caused by rather poor light absorption due to the upright stacking of DIP molecules and the related transition dipole orientation perpendicular to the electric field vector of incoming light. Therefore we addressed the enhancement of the photocurrent in DIP/C60 cells by various approaches: First, we performed studies on excitonic transport by photoluminescence (PL)-quenching. Second, different exciton blocking layers (EBL) like Batho-Phenanthroline (BPhen) or 1,4,5,8-Naphthalene-Tetracaboxylic Acid Dianhydride (NDTCA) were employed for minimizing the recombination losses at the organic-metal interface. Finally, metallic nanostructures were implemented for improving the light absorption of DIP. Financial support by DFG (project PF385/4) is gratefully acknowledged.
[1] D. Kurrle and J. Pflaum, Appl. Phys. Lett. 92 (2008) 133306