Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.58: Poster

Montag, 12. März 2018, 17:30–19:30, Poster B

Electric-field-induced Molecular Modifications in Organic Semiconductors: Studies in Frequency and Time Domain — •Debkumar Rana, Patrice Donfack, Javid Shirdel, Vladislav Jovanov, Veit Wagner, and Arnulf Materny — Physics and Life Sciences, Jacobs University Bremen, Campus Ring 1, 28759 Bremen

Recently, the field of organic electronics has seen an impressive progress, which was pushed forward due to the attractive application potential of the organic semiconductors. Thin film transistors, diodes, solar cells etc. based on polymers like Poly(3-hexylthiophene) (P3HT) show advantages due to their wide range of variability, mechanical properties, ease of fabrication, and, related to this, low costs.

The performance of organic electronics has been improved greatly, but still a more detailed understanding of the elementary processes is required. For this, we have studied the influence of external electric fields on the vibrational/vibronic and excitonic properties of Poly(3-hexylthiophene) (P3HT)-based semiconductor systems using Raman spectroscopy as well as femtosecond time-resolved spectroscopy. Changes in the Raman spectra (line broadenings and shifts) yield information about the coupling of vibrations to the electric fields. The influence on the life time of excitons after excitation with a femtosecond laser pulse gives insights into the field-dependence of relaxation and decay channels. First experimental results will be presented and discussed.