2015/07/03 by Andres Castellanos-Gomez, Andrés Castellanos-Gómez, Jorge Quereda +7 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Perovskite Materials and Applications #Quantum Dots Synthesis And Properties #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1088/0957-4484/27/11/115705
Main text: 4 figures. Supporting information: 4 figures
arxiv created 2015/07/03 · openalex publication_date 2016/02/15 · arxiv updated 2016/03/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
The possibility of spatially resolving the optical properties of atomically thin materials is especially appealing as they can be modulated at the micro- and nanoscale by reducing their thickness, changing the doping level or applying a mechanical deformation. Therefore, optical spectroscopy techniques with high spatial resolution are necessary to get a deeper insight into the properties of two-dimensional materials. Here we study the optical absorption of single- and few-layer molybdenum disulfide (MoS2) in the spectral range from 1.24 eV to 3.22 eV (385 nm to 1000 nm) by developing a hyperspectral imaging technique that allows one to probe the optical properties with diffraction limited spatial resolution. We find hyperspectral imaging very suited to study indirect bandgap semiconductors, unlike photoluminescence that only provides high luminescence yield for direct gap semiconductors. Moreover, this work opens the door to study the spatial variation of the optical properties of other two-dimensional systems, including non-semiconducting materials where scanning photoluminescence cannot be employed.