Polarization-Sensitive Photodetector Based on WSe2/As0.6P0.4/WS2 Heterojunction

The rapid advancements in optoelectronics and their widespread applications have spurred the development of high-performance photodetectors. This study presents a dual-van der Waals heterostructure photodetector, composed of WSe 2, As 0.6 P 0.4, and WS 2 . It demonstrates outstanding polarization-sensitive light detection without external bias, with a sensitivity of 487 mA/W, a detection capability of 6.09 × 10 11 Jones, and an external quantum efficiency (EQE) of 95% at 635 nm, along with rise/fall times of 18–36 ms. The device also exhibits notable anisotropic polarization sensitivity (4.8 at 405 nm). With its broad spectral coverage (400–1100 nm), fast response, and high sensitivity, this photodetector shows significant promise for imaging applications. The development of anisotropic van der Waals heterojunctions provides a key reference for the design of high-performance, self-powered polarization photodetectors.