---------------------------------------------------------------------------------------------- Project: A6 Title: Switching behaviour in MoS2-based memristors DESY group: FS-PETRA-D (PETRA Diffraction and Scattering) Type: On-site Duration: 19th july - 10th sep 2021 Description: This summer student work will be dealing with a study of a memristor's resistive states at various ambient humidity using grazing incident wide-angle X-ray scattering (GIWAXS). The memristor is an electrical element that resistive state depends on the passed charged. These elements can be used as a new type of data storage device or an active element for neuromorphic computation. Ag/2D-MoS2/Ag structure as a memristor with the resistance ratio between on and off state higher than 10^6 and set voltage lower than 0.2V will be prepared on the surface of anodic alumina membrane by spin-coating technique. An in-situ experiment on the memristor active layer based on MoS2 nanosheets during the memristor switching between resistance stages will be provided for the memristor switching mechanism determination at the different humidity atmosphere in the humidity cell. A Schottky barrier screening by vacancies or dissolving Ag+ ions associated with conductive filament formation will be considered as two possible switching mechanisms. Both increases in the scattering contrast and the interlayer distance between MoS2 nanosheets due to the intercalation of Ag+ ions are expected to be revealed with the experiment of the synchrotron radiation in GIWAXS geometry. The memristor switching mechanism determination will allow suggesting a new way to create memristors with outstanding characteristics. Special Qualifications expected: Experience in operation with electrochemical setups and impedance spectroscopy Experience in thin films deposition (with casting or coating techniques) and characterization Cancellation Policy: If due to the CoViD-19 pandemic the student can not be on-site, the project will be converted to a remote project. ----------------------------------------------------------------------------------------------