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Christian Klinke - "Two-dimensional colloidal nanostructures: Synthesis and electrical transport"

Department of Chemistry, Swansea University, Singleton Park, Swansea SA2 8PP, UK
Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany

Max Planck Institute for the Science of Light
Leuchs Division

Time and place:
11 a.m., December 1, 2017, Light Lounge, A.3.500, Staudtstr. 2

In my talk I will show that two-dimensional colloidal nanosheets represent very attractive optoelectronic materials. They combine good lateral conductivity with solution-processability and geometry-tunable electronic properties. For example, the formation of ordered and densely packed ligand surface layers of oleic acid on {100} lead sulfide surfaces can drive the normally isotropic growth of colloidal crystals into a two-dimensional oriented attachment of nanocrystals, resulting in PbS nanosheets. The electronic confinement in height allows tuning the effective bandgap of the materials, which make them interesting for optoelectronic applications. Thus, the electrical transport through these materials was analyzed in devices like field-effect transistors and solar cells. It turns out that the electronic confinement allows for an optimization of their performances. Further, I will show that colloidal 2D materials show interesting spintronic effects.