Abstract
Photodetectors based on transition metal dichalcogenides (TMDs) have been widely reported in the literature and molybdenum disulfide (MoS2) has been the most extensively explored for photodetection applications. The properties of MoS2, such as direct band gap transition in low dimensional structures, strong light–matter interaction and good carrier mobility, combined with the possibility of fabricating thin MoS2 films, have attracted interest for this material in the field of optoelectronics. In this work, MoS2-based photodetectors are reviewed in terms of their main performance metrics, namely responsivity, detectivity, response time and dark current. Although neat MoS2-based detectors already show remarkable characteristics in the visible spectral range, MoS2 can be advantageously coupled with other materials to further improve the detector performance Nanoparticles (NPs) and quantum dots (QDs) have been exploited in combination with MoS2 to boost the response of the devices in the near ultraviolet (NUV) and infrared (IR) spectral range. Moreover, heterostructures with different materials (e.g., other TMDs, Graphene) can speed up the response of the photodetectors through the creation of built-in electric fields and the faster transport of charge carriers. Finally, in order to enhance the stability of the devices, perovskites have been exploited both as passivation layers and as electron reservoirs.
Highlights
Nanoparticles (NPs) and quantum dots (QDs) have been exploited in combination with MoS2 to boost the response of the devices in the near ultraviolet (NUV) and infrared (IR) spectral range
This review summarizes the different photodetector structures based on MoS2 presented so far
For NUVFigure 15. (a) Scheme of a phototransistor based on a MoS2 -ZnO structure and developed on a flexible PET substrate; vis-near infrared (NIR) application, graphene is often used as contact material [6], together with other (b) response of the phototransistor to an incident UV (254 nm) light over time
Summary
The optical absorption of visible light by in the monolayer limit is band. 2 in the monolayer limit is dominated band. 2 in the monolayer limit is dominated dominated by the direct transition from the points of the valence band. Light ablight absorption experiments show resonant peculiar resonant features in 2D structures of MoS23), sorption experiments show peculiar features in. (Figure 3), that can be associated with its strong excitonic nature [4,15]. The experimentally that associated with its strong excitonic nature [4,15]. The experimentally observed that cancan be be associated with its strong excitonic nature observed absorption peaks at specific energies The relative positions of the A and [20])
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