Proceedings of Online Meetup: Shape-Controlled Nanocrystals: Synthesis, Characterization Methods and Applications (ShapeNC)
Publication date: 6th May 2020
Quasi-two-dimensional semiconductor nanoplatelets exhibit spectrally pure, directional fluorescence due to their highly anisotropic shape. In order to make directional light emission accessible in applications, nanoplatelets have to be collectively oriented in the solid state. Existing methods use excess surfactants to control their self-assembly into ordered films at liquid interfaces. The usage of such additives could be detrimental for optoelectronic applications. Here we report the effective control over the collective orientation of nanoplatelets in self-assembled films by exploiting exclusively the solvent evaporation rate. This kinetically driven self-assembly method yields well-defined monolayer films with controlled nanoplatelet orientation (either all oriented “edge-up” or “face-down”) without depositing additives. The absence of additives enables strong electronic coupling between the nanoplatelets making these films suited for optoelectronic applications. The strong coupling is apparent from contact-free photoconductivity measurements on monolayers that demonstrate a clear orientation dependent conductivity in self-assembled NPLs, as opposed to the purely excitonic response of isolated nanoplatelets in a dispersion. The orientation dependence originates from the orientation-dependent inter-nanoplatelet coupling strengths. The ability to assemble nanoplatelets in highly ordered monolayers with varying electronic properties paves the way for new applications in electro-optic devices.
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