Dresden 2020 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 16: 2D semiconductors and van der Waals heterostructures III (joint session HL/DS)
DS 16.4: Vortrag
Dienstag, 17. März 2020, 10:30–10:45, POT 81
Light-driven capacitive charge injection in 0D-2D hybrid nanostructures — •Ilka Kriegel1, Michele Ghini1, Liberato Manna1, Nicholas J. Borys2, and P. James Schuck3 — 1Department of Nanochemistry, Istituto Italiano di Tecnologia, Italy — 2Department of Physics, Montana State University, Bozeman, MT, USA — 3Department of Mechanical Engineering, Columbia University, New York, NY, USA
In this work we reveal that the coupling of indium tin oxide (ITO) nanocrystals to monolayer MoS2 results in a light-driven charge-injection scheme that quasi-permanently dopes monolayer MoS2 to extents competing with electrostatic doping. The cooperative electronic properties of such novel 0D 2D hybrids display efficient and permanent charge separation after light absorption. The electrons are stored in the nanocrystals, while the holes are transferred to the 2D material accumulating in regions of initially enhanced n-type doping and preferentially along edges and grain boundaries. Charge separation over distances up to 40 μm away from the local (micron sized) optical excitation spot are observed. Notably, carrier injection follows a capacitor-like behavior with capacitance values in the femto Farad range leading to the photo-charging of a model capacitor. An average optically induced photodoping of each nanocrystal with more than 40 carriers is extracted. These studies present a foundational building block for next-generation light-driven energy storage devices. Additionally, the remote-control of local charge density opens prospects for contactless and optically driven 2D material electronics.