Peculiar spectra and photocurrent oscillation caused by laser interference in WX2 (X = S, Se) bubbles

Strain and Interference Synergistically Modulated Optical and Electrical Properties in ReS2/Graphene Heterojunction Bubbles

“…Then, the ReS 2 /gr heterobubbles with different sizes were prepared, and the corresponding AFM height profiles across the top of the bubbles are shown in Figure f. It can be found that all bubbles present universal shape characteristics, and the aspect ratio h / a was a constant independent of bubble sizes, which is consistent with the previous reports. ,− Therefore, for ease of describing the strain distribution in ReS 2 /gr heterobubbles, the morphology of bubbles with different sizes can be normalized, where the out-of-plane deflection ( w ) and radial positions ( r ) of each bubble are normalized by its central height ( h ) and its radius ( a ), respectively, It is further indicated that the bubbles with different sizes process universal shape characteristics (Figure e), with a fitting index of α = 2.…”

“…When the laser irradiates on the surface of the bubble, part of the light will be reflected at the Si/SiO 2 interface. Therefore, when constructive (destructive) interference is satisfied, the Raman intensity reaches a maximum (minimum) value, and then the intensity oscillations appear in the bubble region. ,− The differences in background color in flat regions may be attributed to systematic errors (Note S4, Figures S10–S12). Accompanying by the oscillation of Raman intensity, the ReS 2 /gr heterobubble also exhibits obvious Raman position oscillation (Figure g,h and Figure S13).…”

“…Accompanying by the oscillation of Raman intensity, the ReS 2 /gr heterobubble also exhibits obvious Raman position oscillation (Figure g,h and Figure S13). Generally, the constructive/destructive interference is considered to increase/reduce the local temperature, which further leads to the reduced/increased the phonon frequency of ReS 2 . ,, Therefore, the interference-induced local heating effect can lead to the oscillation of Raman position, and the Raman position reaches the maximum (minimum) under destructive (constructive) interference conditions due to lower (higher) local temperatures. It may also explain that the interference ring with the weakest Raman intensity corresponds to the largest Raman position.…”

“…However, the anisotropic properties modulated by strain in ReS 2 or other low-symmetry 2D material bubbles have not been studied yet. Interestingly, for 2D material bubbles with larger sizes, the optical interference occurs on the bubble surface due to the underlying microcavity, which may also affect the optical and electrical properties. − Considering the coexistence of strain and optical interference in large-sized ReS 2 bubbles, it is necessary to investigate their comodulation effect on optical and electrical properties of ReS 2 .…”

Chemical Vapor Deposition-Grown Nonlayered α-MnTe Nanosheet for Photodetectors with Ultrahigh Responsivity and External Quantum Efficiency

“…Since the first successful exfoliation of graphene in 2004, a widely studied series of materials have been reduced to two dimensions via physical or chemical methods, which have been proven to cause great improvement in electronics, optics, magnetism, and energy. − Currently, most research on 2D materials focuses on layered van der Waals materials like graphene, MoS 2 , black phosphorus, WS 2 , et al − However, most of all the known three-dimensional materials are nonlayered materials with a high surface energy due to unsaturated dangling bonds. Therefore, developing a new method for nonlayered 2D materials is of great importance for 2D devices.…”