Nanomaterials for optoelectronics: an overview

Exciton and Trion at the Perimeter and Grain Boundary of CVD-Grown Monolayer MoS2: Strain Effects Influencing Application in Nano-Optoelectronics

“…Nanolayers of transition metal dichalcogenides (TMDCs) are interesting as two-dimensional (2D) materials for novel nano-optoelectronics, with molybdenum disulfide (MoS 2 ) being one of the most studied. At the limit of the monolayer (1L), whose thickness is ∼0.7 nm, MoS 2 possesses a direct bandgap leading to an intense excitonic photoluminescence (PL) and an optical bandgap value ( E g ) of ∼1.88 eV (660 nm) at room temperature. − MoS 2 optical and photoelectrical properties are favorable for its application as an active nanoelement in red-light emitters − and visible-light detectors. − At the same time, the intensity of PL and photocurrent may be enhanced via the decoration with sensitizers such as semiconductor quantum dots, , plasmonic nanoparticles, − and other approaches . Also, the properties of 2D MoS 2 can be enhanced and tuned in a wide range by decreasing the lateral size of the flakes, approaching nanoflakes and 2D quantum dots. − …”