Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Two-dimensional colloidal nanosheets represent very attractive optoelectronic materials. They combine good lateral conductivity with solution-processability and geometry-tunable electronic properties. I will show that 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. Hereby, the presence of chlorine containing co-solvents plays a prominent role during the initial nucleation and growth process of the nanocrystals. The formation mechanism will be discussed, as well as its transfer to other two-dimensional material systems. The shape and size of the structures are tunable by the synthesis conditions. The electronic confinement allows tuning the effective bandgap of the materials, which make them interesting for electronic applications. Thus, the electrical transport through these materials will 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.
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