Here, a lateral monolayer heterojunction of WS2-WSe2 is successfully prepared with an atomically sharp interface and a band alignment of type-II structure. Intriguingly, this heterojunction photodetector (PD) achieves outstanding characteristics of photocurrent generation in both photovoltaic and ...
Keywords: unipolar barrier structure, mixed-dimensional de- vice, WS2/WSe2/p-Si heterojunctions, photodetector, dark cur- rent suppression INTRODUCTION Due to their distinctive properties, including strong light-matter coupling [1,2], tunable band structure [3–5], self-passivated surface [6,7],...
Here we investigated interlayer exciton dynamics and transport in WS2–WSe2 heterobilayers in time, space and momentum domains using transient absorption microscopy combined with first-principles calculations. We found that the exciton motion is modulated by twist-angle-dependent moiré potentials around ...
4 Determination of WSe2 and WS2 flake alignment. Polarization-dependent SHG signal on monolayer WSe2 (red circles) and WS2 (black circles) regions of device D1 and corresponding fittings (red and black curves, respectively). Extended Data Fig. 5 ODRC signal for other aligned WSe2/WS2 ...
In this work, WSe2/WS2 heterostructures with type-II band alignment were fabricated for high-performance self-powered photodetector and photovoltaics. Due to the ambipolar nature of WSe2, the junction property could be efficiently modulated with electrostatic doping. Under optimized gate voltage and ...
Uponlight illumination, excess photoexcited electrons are generated anddrift to a WS 2 channel due to the type-II band alignmentat the WS 2 /WSe 2 heterojunction, leaving photoexcitedholes in WSe 2 nanodots. Recirculation of electrons acrossthe WS 2 channel provides a photogain during the life...
Effects of lower symmetry and dimensionality on Raman spectra in two-dimensional WSe2 . Phys. Rev. B 88, 195313 (2013). Article Google Scholar Terrones, H. et al. New first order Raman-active modes in few layered transition metal dichalcogenides. Sci. Rep. 4, 4215 (2014). Article CAS...
Figure 2a shows the interlayer exciton PL spectra from the flat WS2/WSe2 heterostructure for 0.05-μW (black curve), 1-μW (red curve) and 100-μW (blue curve) laser excitation power, P, at 4 K. The spectrally integrated PL intensity of the interlayer exciton with respect to P is...
Interlayer exciton diffusion is studied in atomically reconstructed MoSe2/WSe2 heterobilayers with suppressed disorder. Local atomic registry is confirmed ... E Wietek,M Florian,J Gser,... - 《Physics Review Letter》 被引量: 0发表: 2024年 Subcycle contact-free nanoscopy of ultrafast interlayer ...
1a. Due to the ~4% lattice mismatch, the angle-aligned WS2/WSe2 bilayer would form a triangular moiré superlattice with a period of ~8 nm. The strong moiré coupling1,5 will result in mini flatbands26, which could host correlated insulating state at half band filling with one carrier...