Enhanced Photodetection Range from Visible to Shortwave Infrared Light by ReSe 2 /MoTe 2 van der Waals Heterostructure.

Type II vertical heterojunction is a good solution for long-wavelength light detection. Here, we report a rhenium selenide/molybdenum telluride (n-ReSe 2 /p-MoTe 2 ) photodetector for high-performance photodetection in the broadband spectral range of 405-2000 nm. Due to the low Schottky barrier contact of the ReSe 2 /MoTe 2 heterojunction, the rectification ratio (RR) of ~10 2 at ±5 V is realized. Besides, the photodetector can obtain maximum responsivity (R = 1.05 A/W) and specific detectivity (D* = 6.66 × 10 11 Jones) under the illumination of 655 nm incident light. When the incident wavelength is 1550-2000 nm, a photocurrent is generated due to the interlayer transition of carriers. This compact system can provide an opportunity to realize broadband infrared photodetection.