WS2/MHS PdTe2/Si Mixed-Dimensional Heterojunction as Ultra-Broadband Photodetector for Health and Safety Monitoring

Cuicui Ling; Chen Rong; Boxuan Men; Jingyao Wang; Jiayi Sun; Tuo Zhang; Lingtan Zhang; Tianchao Guo; Peiheng Zhou; Wenpeng Liu

doi:10.1002/adhm.202402507

WS₂/MHS PdTe₂/Si Mixed-Dimensional Heterojunction as Ultra-Broadband Photodetector for Health and Safety Monitoring

Adv Healthc Mater. 2025 Jan 10:e2402507. doi: 10.1002/adhm.202402507. Online ahead of print.

Authors

Cuicui Ling¹, Chen Rong¹, Boxuan Men², Jingyao Wang^{1

3}, Jiayi Sun¹, Tuo Zhang⁴, Lingtan Zhang⁵, Tianchao Guo⁶, Peiheng Zhou¹, Wenpeng Liu^{7

8}

Affiliations

¹ School of Materials Science and Engineering, China University of Petroleum, Qingdao 266580&Key Laboratory of Multi-spectral Absorbing Materials and Structures (University of Electronic Science and Technology of China), Ministry of Education, Chengdu, 610054, China.
² College of Design and Engineering, National University of Singapore, Singapore, 119077, Singapore.
³ National Laboratory of Solid State Microstructures, School of Electronic Science and Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.
⁴ School of Materials Science and Engineering, Southeast University, Nanjing, 211189, China.
⁵ School of Geophysics and Information Technology, China University of Geosciences, Beijing, 100083, China.
⁶ Materials Science and Engineering, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
⁷ Harvard Medical School, Harvard University, Boston, MA, 02115, USA.
⁸ Division of Engineering in Medicine and Renal Division, Department of Medicine, Brigham Women's Hospital, Boston, MA, 02115, USA.

PMID: 39797469
DOI: 10.1002/adhm.202402507

Abstract

Ultra-broadband photodetectors (UB-PDs) are essential in medical applications, public safety monitoring, and various other fields. However, developing UB-PDs covering multiple bands from ultraviolet to medium infrared remains a challenge due to material limitations. Here, a mixed-dimensional heterojunction composed of 2D WS₂/monodisperse hexagonal stacking (MHS) 3D PdTe₂ particles on 3D Si is proposed, capable of detecting light from 365 to 9600 nm. The exceptional performance of this photodetector is attributed to MHS PdTe₂ particles, which increase the specific surface area and enhance UV-to-NIR absorption of the 2D WS₂ nanofilm. At 980 nm (0 V), the device achieves a responsivity of 7.8 × 10² mA W^-1, a detectivity of 2.5 × 10¹³ Jones, and a sensitivity of 2.6 × 10⁸ cm² W^-1. The MHS PdTe₂ layer amplifies the built-in electric field and enhances heterojunction self-powered capability. This photodetector exhibits a high switching ratio (10⁴), a rapid response time (24.14 µs), and a significant photocurrent gain at zero bias. Its application in blood oxygen saturation analysis is demonstrated based on dual-wavelength photoplethysmography (PPG) at 650 and 905 nm, and infrared perspective imaging at 808 nm. Additionally, the device can differentiate materials based on their transmittance at 9600 nm. This research opens new avenues for the multifunctional use of UB-PDs.

Keywords: mixed‐dimensional heterojunction; monodisperse hexagonal stacking palladium telluride particles, tungsten disulfide; ultra‐broadband photodetectors.

Abstract

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