Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 64: Poster: Photovoltaics and Optics
HL 64.23: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1C
Optical Spectroscopy on Organic DNTT Crystals — •Benjamin Heidelmeier1, Marleen Axt2, Andrea Karthäuser2, Gregor Witte2, and Wolfram Heimbrodt1 — 1Experimental Semiconductor Physics, Department of Physics, Philipps-Universität Marburg, Germany — 2Molecular Solid State Physics, Department of Physics, Philipps-Universität Marburg, Germany
DNTT (dinaphtho[2,3-b:2’,3’-f]thieno[3,2-b]thiophene) is a promising organic semiconductor for application in organic field effect transistors (OFET). It shows a higher charge carrier mobility in comparison to the common OFET material Pentacene while it is stable under ambient conditions. To improve the performance of OFETs it is important to study and understand the optoelectronic processes in such organic solids.
Here we report an optical characterization of DNTT single crystals that were grown by molecular beam deposition onto glass substrates coated with thin oil films. This yields platelet shaped single crystals with a typical diameter of 50µm. Using photoluminescence, absorption and time resolved spectroscopy we investigated the optical properties of such crystals. In particular we measured the polarization dependence of absorption and photoluminescence with respect to the crystallographic axes. The transition dipole moment is oriented along the short molecular axis. We were able to reveal both Davydov components. Even the excitonic luminescence exhibits a strong linear polarization.