Bulk tungsten disulfide (WS2) offers advantages such as exceptional lubricity and high thermal stability. Monolayer WS2 has desirable optoelectronic properties, including strong light-matter interactions, as well as being strong and flexible.

Nov 15, 2023 · They demonstrated that GaN/MoS 2 and GaN/WS 2 heterostructure cross the band-edge position of conductivity band minimum (CBM) and valence band maximum (VBM), and the band gap and band alignment also satisfied the needs of photocatalyst water splitting.

Jul 15, 2021 · To estimate the conduction band minimum (CBM) energy above E F at the K-point, one can add the exciton binding energy to the optical gap yielding the electronic (single particle) bandgap. The exciton binding energy reported for ML-WS 2 ranges from 0.71 eV to 0.28 eV.

May 8, 2024 · By using micro-focused angle-resolved photoemission spectroscopy during in situ doping of the top graphene layer, we observe a strong quasiparticle peak accompanied by several carrier...

Mar 1, 2019 · The indirect energy gap formed between the valence band maximum (VBM) at the Γ-point and the conduction band minimum (CBM) locating on the S Γ-path. As a comparison, we find that the energy gap of the bulk WS 2 (0.909 eV) …

Jun 1, 2024 · In addition, such weak peak at ∼848 nm can be ascribed to interlayer exciton recombination between electrons from conduction band minimum (CBM) of MoS 2 and holes from valence band maximum (VBM) of WS 2, as provided in Fig. 2 (f).

The conduction band minimum (CBM) and the valance band maximum (VBM) are both located at K point. When the layer number of WS 2 increases, the VBM shifts to Γ point, while the CBM locates between K and Γ points (called Q point). In addition, the band gap value would decrease with the increase of the layer number (Figure 2b).[33]

Sep 30, 2022 · We found that the arsenene/WS 2 heterostructure possesses a type-II band alignment. Moreover, the electric field can effectively tune both the band gap and the band alignment type. Additionally, the band gap could be tuned effectively by strain, while the band alignment type is robust under strain.

(c)-(d) WS2–MoS2 heterobilayer (HtBL). at the CBM(K) and VBM(Г). The isosurface value is set to 1.8 × 10-3 eÅ3. Purple, grey, and yellow colors represent Mo, W, and S atoms, respectively.

Thus, our experimental results indicate that the indirect emission originates from Λ→Γ transition in MoS2 and WS2 but K→Γ transition in WSe2. These experimental observations are consistent with the DFT results for WS2 and WSe2 where the CBM is located at the Λ and K point, respectively.