Regensburg 2004 – wissenschaftliches Programm
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SYOH: Organic and Hybrid Systems for Future Electronics
SYOH 5: Poster
SYOH 5.52: Poster
Donnerstag, 11. März 2004, 18:00–21:00, B
Photodegradation of organic films and organic solar cells — •O. Schulz1, M. Spode1, G. Ecke1, J. Uziel1, W. Schliefke1, M. Al-Ibrahim1, O. Ambacher1, D. Raabe2, M. Helbig2, L. Carta-Abelmann3, P. Scharff3, U. Zhokhavets4, T. Erb4, and G. Gobsch4 — 1TU Ilmenau, Center for Micro- und Nanotechnologies, D-98693 Ilmenau, Germany — 2SurA Chemicals GmbH, D-07745 Jena, Germany — 3TU Ilmenau, Chemistry, D-98693 Ilmenau, Germany — 4TU Ilmenau, Experimental Physics I, D-98693 Ilmenau, Germany
For the application of organic solar cells a high electronic and structural stability is of fundamental importance in addition to a high conversion efficiency. Photovoltaic devices with active layers based on polymers as poly-3 hexylthiophene(P3HT) and tetraphenyl-biphenyldiamin-diphenylxylylene(TPD-DPX) show a significant degradation of optoelectronic properties under AM1.5 illumination. For instance the short circuit current density of a P3HT based solar cell decreases under the influence of light(60 mW/cm2) within 2 minutes by 50 %.
Polymer films of 30 - 200 nm thickness are produced by spin-coating. The electrical, optical and structural parameters of the generated organic devices are investigated with regard to the dependency of the photodegradation effects on ambient parameters. These parameters are oxygen pressure, temperature and light intensity. The photodegradation process is analysed by measurements of current-voltage curves, spectral resolved photoconductivity, spectral resolved ellipsometry, atomic force microscopy and Auger electron spectroscopy.