Controlling the electronic bands of a 2D semiconductor by force microscopy

Autor: Francisco Carlos Carneiro Soares Salomão, Natália P. Rezende, F W N Silva, Daniel Brito de Araújo, Rodrigo Queiros de Almeida, Andreij C. Gadelha, Eduardo B. Barros, Leonardo C. Campos
Rok vydání: 2020
Předmět:
Zdroj: 2D Materials. 7:045029
ISSN: 2053-1583
DOI: 10.1088/2053-1583/aba5cb
Popis: In this work, we investigate the transverse transport properties of few-layers MoS2 using a Conductive Atomic Force Microscopy based technique. We find that the system changes between a low-force regime, characterized by a nearly-ideal contact between the MoS2 flake and the substrate, and a high-force regime, for which this contact starts to become highly non-ideal. We propose a 3-diode model that effectively describes the current-voltage characteristics of few-layers MoS2. From this model, we estimate how fast the energy gaps of two-dimensional MoS2 materials change as a function of the applied force. From our analysis, we estimate that MoS2-Au Schottky barrier heights change at the rate of 0.21, 0.23, and 0.78 meV nN−1 for the few-layers, three-layers, and two-layers MoS2, respectively. Our work opens up new possibilities of investigating and controlling the electronic properties of 2D semiconducting materials.
Databáze: OpenAIRE