Cinzia Di Giorgio, Elena Blundo, Julien Basset, Giorgio Pettinari, Marco Felici, Charis H L Quay, Stanislas Rohart, Antonio Polimeni, Fabrizio Bobba, Marco Aprili
We implemented radio frequency-assisted electrostatic force microscopy (RF-EFM) to investigate the electric field response of biaxially strained molybdenum disulfide (MoS2 ) monolayers (MLs) in the form of mesoscopic bubbles, produced via hydrogen (H)-ion irradiation of the bulk crystal. MoS2 ML, a semiconducting transition metal dichalcogenide, has recently attracted significant attention due to its promising optoelectronic properties, further tunable by strain. Here, we take advantage of the RF excitation to distinguish the intrinsic quantum capacitance of the strained ML from that due to atomic scale defects, presumably sulfur vacancies or H-passivated sulfur vacancies...
January 18, 2024: ACS Nano