Charge transfer in graphene/WS2 enhancing the saturable absorption in mixed heterostructure films

Mass-producible 2D-WS2 bulk modified screen printed electrodes towards the hydrogen evolution reaction

“…2(B) highlights the presence of the binding energies for W5p 3/2 , W4f 5/2 and W4f 7/2 at 37.5, 34.0 and 31.5 eV, repectively, in which the W5p 3/2 peak corresponds to the W 6+ species and the W 4+ oxidation state is represented by the peaks for W4f 5/2 and W4f 7/2 . 45,46 Shown in Fig. 2(C) are the binding energies for S2p 1/2 and S2p 3/2 at 167.5 and 166.2 eV, ascribed to S 2À in WS 2 .…”

PbE (E = S, Se) Colloidal Quantum Dot-Layered 2D Material Hybrid Photodetectors

“…Figure 2 shows the energy band structures of graphene, phosphorene, and molebdynum disulfide (MoS 2 ), a TMD that is one of several that display a transition from indirect to direct bandgap as the sample is reduced from bulk to single monolayers [104,105], which is key for efficient photon absorption [71]. Photodetectors utilizing layered 2D materials have been widely reported [89,103,[106][107][108][109][110][111][112], as have studies on charge transport and electronic properties of these materials [113][114][115][116][117][118][119][120]; however, the relatively low absorption, attributable to the atomically thin profile [121], remains a serious challenge. [104,105], which is key for efficient photon absorption [71].…”

Study of Structural and Optoelectronic Properties of Thin Films Made of a Few Layered WS2 Flakes

“…Hence, safer solvents are under consideration, e.g., mixture of DI (deionized) water and IPA (isopropyl alcohol) [ 18 ]. Flakes exfoliated using LPE techniques can be further employed in the vacuum filtration method to form different kinds of films [ 23 , 24 , 25 , 26 ].…”

“…Literature provides reports concerning thick free-standing films or heterostructures based on WS 2 [ 13 , 23 , 24 ]. For instance, Lu et al reports thin heterostructures made of graphene and WS 2 films [ 24 ]. The work shows mostly nonlinear optical characteristics of relatively thin layered sandwiches with different thickness (from 60 to 135 nm).…”