Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 71: New concepts and new materials
HL 71.6: Talk
Thursday, March 19, 2015, 11:30–11:45, EW 201
Coupled organic-inorganic nanostructures: Size dependent carrier transport in tetrathiafulvalenedicarboxylate capped PbS nanocrystals — •Alexander André1,2, Mahdi Samadi Khoshkoo1,2, and Marcus Scheele1,2 — 1Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18 72076 Tübingen — 2Center for Light-Matter Interactions, Sensors&Analytics (LISA+), Auf der Morgenstelle 15 72076 Tübingen
Both, inorganic semiconductor quantum dots (QD) and organic semiconductors (OSC), are emerging classes of materials for optoelectronic applications. QDs provide the possibility of size tailored optical and electronic properties all the while keeping sufficiently high charge carrier mobilities and diffusion lengths. OSCs however, offering high material purity and a large degree of ordering in thin films, have already been successfully implemented as transistors and light emitting devices. In our work we aim to combine these two material classes in order to get the best of both worlds. To that end we prepare coupled organic-inorganic nanostructures, so called COINs. Thin films of PbS nanocrystals, with different diameters, functionalized with tetrathiafulvalenedicarboxylate were fabricated via spin coating or superlattice self-assembly at a liquid-liquid interface. The morphology of the resulting samples was investigated with SEM, FT-IR and AFM. The conductivity and charge carrier mobility was measured using a field effect transistor setup. We can show the successful formation of highly ordered nanocrystal superlattices with charge carrier mobilities on the order of 10−4 cm2/V*s.