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Kinetic Control over Self-Assembly of Semiconductor Nanoplatelets

  • Semiconductor nanoplatelets exhibit spectrally pure, directional fluorescence. To make polarized light emission accessible and the charge transport effective, nanoplatelets have to be collectively oriented in the solid state. We discovered that the collective nanoplatelets orientation in monolayers can be controlled kinetically by exploiting the solvent evaporation rate in self-assembly at liquid interfaces. Our method avoids insulating additives such as surfactants, making it ideally suited for optoelectronics. The monolayer films with controlled nanoplatelets orientation (edge-up or face-down) exhibit long-range ordering of transition dipole moments and macroscopically polarized light emission. Furthermore, we unveil that the substantial in-plane electronic coupling between nanoplatelets enables charge transport through a single nanoplatelets monolayer, with an efficiency that strongly depends on the orientation of the nanoplatelets. The ability to kinetically control the assembly of nanoplatelets into ordered monolayers with tunable optical and electronic properties paves the way for new applications in optoelectronic devices.

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Document Type:Article
Author:Rebecca Momper, Heng Zhang, Shuai Chen, Henry Halim, Ewald Johannes, Stoayan YordanovORCiD, Daniele Braga, Balthasar BlülleORCiD, David DoblasORCiD, Tobias KrausORCiD, Mischa BonnORCiD, Hai I. Wang, Andreas RiedingerORCiD
Parent Title (English):Nano Letters
First Page:4102
Last Page:4110
Year of first Publication:2020
Release Date:2022/09/22
Tag:angle-dependent photoluminescence spectroscopy; orientation control; terahertz spectroscopy; welf-assembly; wemiconductor nanoplatelets
Impact:11.189 (2020)
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 660 Technische Chemie
Open Access:Open Access
Signature:INM 2020/041
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International