The contribution of Fe and Cr to the magnetic properties in (0, 1) doped SnS₂ configurations can be seen intuitively.

In recent years, two-dimensional (2D) type-II van der Waals (vdW) heterojunctions have emerged as promising candidates for high-performance photodetectors. However, direct experimental evidence confirming the enhancement of photoelectric properties by the heterojunction’s type and structure remains scarce. In this work, we present flexible photodetectors based on individual GaSe and MoS₂, as well as a vertically stacked type-II GaSe/MoS₂ vdW heterojunction on polyethylene terephthalate (PET) substrate. These devices demonstrate outstanding responsivities and rapid response speeds, ensuring stable and repeatable light detection. It is notable that the GaSe/MoS₂ heterojunction photodetector exhibits the highest on-off ratio and fastest response speed, attributed to the formation of type-II band alignment. Furthermore, the GaSe/MoS₂ heterojunction photodetector maintains robust stability even in a bent state, highlighting remarkable flexibility. This work exemplifies the type-II vdW heterojunctions in enhancing photoelectric properties through direct in-situ experimentation, laying the groundwork for practical applications of 2D flexible photodetectors.

Bilayer phosphorene homojunctions have attracted considerable interest owing to their natural bandgap and high carrier mobility. However, very little is known about the valuableness in arrays of bilayer phosphorene homojunctions with different rotated angles. In this work, we have presented angular modulated electronic and optical properties of rotated bilayer phosphorene employing first-principles calculations based on density functional theory. The angles in the homojunctions of the rotated bilayer phosphorene are set to be $26.02°,\hspace{0.17em}71.61°,\hspace{0.17em}110.54°,\hspace{0.17em}130.39°$ , and $149.01°$ , respectively, and the homojunctions demonstrate different bandgaps of 0.66 eV, 0.64 eV, 0.63 eV, 0.68 eV, and 0.67 eV, respectively, implying that these homojunctions are good candidates for application in optoelectronics and nanoelectronics. Interestingly, we found that the rotated bilayer phosphorene can greatly enhance the absorption of visible and infrared light, which would provide encouragement on the modeling of the rotated bilayer phosphorene in nanoelectronic and optoelectronic devices.