Scalable Graphene/Sn‐WSe ₂ /Si Photodetector Array With Broadband Response and Starlight Sensitivity for All‐Light Vision

The development of photodetectors that match the sensitivity of biological vision while extending the response beyond the visible spectrum remains a key challenge. Here, we report a scalable photodetector array based on graphene/amorphous Sn‐doped WSe 2 /Si (Gr/Sn‐WSe 2 /Si) heterostructures. The pulsed‐laser‐deposited Sn‐WSe 2 nanofilm exhibits a long carrier lifetime (>5.5 ns). Combined with efficient photocarrier separation in a stacked heterostructure, it enables a remarkable self‐powered photoresponse from 365 to 1550 nm. The device achieves a low noise‐equivalent power of 0.029 fW/Hz 1/2 and a specific detectivity of 3.4 × 10 14 Jones at 808 nm, exceeding retinal sensitivity while offering a broader spectrum. It also boasts a high photo‐switching ratio > 10 6 and fast rise/decay times of 18.3/27.2 µs. Capitalizing on these attributes, broadband visualization, see‐through imaging, and starlight‐level perception at 0.88 nW/cm 2 are demonstrated. Moreover, the photodetector array exhibits excellent pixel‐to‐pixel uniformity, paving the way for the practical deployment of next‐generation imaging technology.