Self‐Powered Broadband Computational Imaging Based on CdS/Ge 2D/3D Type‐I Heterojunction Photodetectors

• DOI: 10.1002/adpr.202400190
• Publication Date: 2025-02-12T04:34:46Z
• Authors: Xiaodi Luo; Jiahao Li; Zixin He; Xiaofei Ma; Qinggang Qin; Wei Chen; Zhengyu Xu; Zhifan Qiu; Yingjian Wang; Liang Li; Dongfeng Shi
• Keywords: self‐powered photodetection; broadband photodetectors; type‐I heterojunctions; Applied optics. Photonics; QC350-467; Optics. Light; computational imaging; TA1501-1820

The breakthrough in van der Waals heterojunction diodes composed of 2D and 3D materials for optoelectronic devices has paved the way advancements broadband optical imaging. However, fabricating traditional array‐based imaging detectors with these remains challenging. Cadmium sulfide (CdS), a historically significant semiconductor material, been extensively used due to its remarkable photoelectric properties chemical stability. Notably, unique type‐I can be formed by combining CdS, prepared through vapor deposition, first‐generation germanium (Ge). His photodetector exhibits outstanding performance, achieving responsivity 54 mA W −1 detectivity 1.4 × 10 9 Jones under zero bias, spectral response range spanning from 265 1550 nm. Herein, CdS/Ge emerging single‐pixel Hadamard algorithm, addressing challenges nonvisible that conventional systems traditionally encounter, is integrated. This approach facilitates low‐sampling‐rate image reconstruction across broad scattering conditions. It anticipated this work will significantly contribute future applications.