Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Ultrafast Electron and Spin Dynamics
O 69.1: Poster
Wednesday, March 18, 2015, 18:15–21:00, Poster A
Influence of linkers on electron dynamics in dye-functionalized SiC — •Nils Fabian Kleimeier1, Deb Kumar Bhowmick1, Linda Stegemann1,2, Cristian Alejandro Strassert1,2, and Helmut Zacharias1,2 — 1Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster — 2Center for Nanotechnology (CeNTech), Universität Münster, Heisenbergstrasse 11, 48149 Münster
Functionalized SiC surfaces have gained wide interest in the field of biosensors, transistors and OLEDs due to the bio-inertness, high stability and large, tunable band gap of SiC. The interaction between the organic dye and the SiC surface can be tuned by using different linker molecules. To investigate the effect of the linkers, benzo[ghi]perylene dye was attached to the surface using p-aminophenyltrimethoxysilane (p-APTMS), aminopropyl-triethoxy-silane (APTES) and aminoundecyltriethoxysilane (AUDTES). Fluorescence images and confocal microscopy were used to determine the distribution of the dyes on the surface and the radiative lifetimes which are in the range of 1-10 ns [1]. To determine the efficiency of electron injection into the SiC, non-radiative lifetimes of about 100 fs were measured using time-resolved two-photon photoemission (TR-2PPE).
[1] Deb Kumar Bhowmick, Steffen Linden, André Devaux, Luisa De Cola, Helmut Zacharias, Small 8, 592 (2012)