Scalable Graphene/Sn-WSe₂/Si Photodetector Array With Broadband Response and Starlight Sensitivity for All-Light Vision.

Authors

Weidan Yao, Kailong Han, Liang Yu, Zuocheng Pu, Wei Gao, Mengmeng Yang, Jiandong Yao, Bing Wang, Dongxiang Luo, Yu Zhao, Huafeng Dong, Zhaoqiang Zheng, Guowei Yang

Published in

Small (Weinheim an der Bergstrasse, Germany). Pages e74431. Jul 13, 2026. Epub Jul 13, 2026.

Abstract

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 WSe₂/Si (Gr/Sn-WSe₂/Si) heterostructures. The pulsed-laser-deposited Sn-WSe₂ 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 × 10¹⁴ Jones at 808 nm, exceeding retinal sensitivity while offering a broader spectrum. It also boasts a high photo-switching ratio > 10⁶ 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/cm² are demonstrated. Moreover, the photodetector array exhibits excellent pixel-to-pixel uniformity, paving the way for the practical deployment of next-generation imaging technology.

PMID:
42439041
Bibliographic data and abstract were imported from PubMed on 13 Jul 2026.

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