Synthesis and Optoelectronic Properties of Two-dimensional Colloidal Nanomaterials
Christian Klinke a
a University of Rostock, Universitätsplatz 3, Rostock, 18055, Germany
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting19 (NFM19)
#Sol2D19. Two Dimensional Layered Semiconductors
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Efrat Lifshitz, Cristiane Morais Smith and Doron Naveh
Invited Speaker, Christian Klinke, presentation 026
DOI: https://doi.org/10.29363/nanoge.nfm.2019.026
Publication date: 18th July 2019

Two-dimensional colloidal nanomaterials have gained more and more attention as attractive optoelectronic materials in the recent years. They combine good lateral conductivity with solution-processability and geometry-tunable electronic properties. The formation of ordered and densely packed surface layers of amphiphilic ligand molecules on certain crystal facets can drive the normally isotropic into a two-dimensional crystal growth, resulting in semiconducting nanosheets. Due to the strongly reduced height,  such metastable materials are in electronic confinement, which allows tuning their effective bandgap. Other features are reduced charge screening, efficient doping, and solution processablility. First, I will discuss the syntheses of the materials, followed by analyses of their optical properties and the electrical transport characterization through these materials as field-effect and spin transistors. In particlar, I will introduce nanosheets based on lead sulfide, tin sulfide and lead halide perovskites. The materials show surprising effects and demonstrate the versatility and usefulness of this synthesis approach. 

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