Karl Franzens University Graz
Graz University of Technology
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Karl Franzens University Graz | Graz University of Technology | |
Watch them as they grow: Structure formation and optical spectroscopy of organic thin films in real time After a brief introduction to molecular and biological materials, we will focus on the growth dynamics and optical properties of organic semiconductor thin films. The general concepts of growth will be shortly summarised, and then it will be shown in which way organic semiconductors can deviate from conventional growth due to their specific characteristics(internal and orientational degrees of freedom, polymorphism; A. C. Dürr et al., Phys. Rev. Lett. 90 (2003) 016104; S. Kowarik et al., Phys. Rev. Lett. 96 (2006) 125504). The special role of the first layer for the growth as well as understanding the binding and molecular distortion and also the charge carrier (electron and hole) injection barrier at the metal interface will also be discussed based on X-ray standing wave (XSW) experiments (A. Gerlach et al., Phys. Rev. B 75 (2007) 045401; L. Romaner et al., Phys. Rev. Lett. 99 (2007) 256801, N. Koch et al., JACS 130 (2008) 7300). Finally, the resulting optical properties of these films as well as their oxidation behaviour (also followed in real time) will be presented (M. Kytka et al., Appl. Phys. Lett. 90 (2007), 131911; A. Hinderhofer et al., J. Chem. Phys. 127 (2007) 194705; U. Heinemeyer et al., Phys. Rev. B 78 (2008) 085210; D. Zhang et al., Phys. Rev. Lett. 104 (2010), 056601). |