Palladium Diselenide Long-Wavelength Infrared Photodetector with High Sensitivity and Stability
Year: 2019
Type: article
Abstract: A long-wavelength infrared photodetector based on two-dimensional materials working at room temperature would have wide applications in many aspects in remote sensing, thermal imaging, biomedical optics, and medical imaging. However, sub-bandgap light detection in graphene and black phosphorus has been a long-standing scientific challenge because of their low photoresponsivity, instability in the air, and high dark current. In this study, we report a highly sensitive, air-stable, and operable long-wavelength infrared photodetector at room temperature based on PdSe 2 phototransistors and their heterostructure. A high photoresponsivity of ∼42.1 AW –1 (at 10.6 μm) was demonstrated, which is an order of magnitude higher than the current record of platinum diselenide. Moreover, the dark current and noise power density were suppressed effectively by fabricating a van der Waals heterostructure. This work fundamentally contributes to establishing long-wavelength infrared detection by PdSe 2 at the forefront of long-IR two-dimensional-materials-based photonics.
Source: ACS Nano
Authors: Mingsheng Long, Yang Wang, Peng Wang, Xiaohao Zhou, Hui Xia, Chen Luo, Shenyang Huang, Guowei Zhang, Hugen Yan, Zhiyong Fan, Xing Wu, Xiaoshuang Chen, Wei Lu, Weida Hu
Institutions: Chinese Academy of Sciences, Shanghai Institute of Technical Physics, University of Chinese Academy of Sciences, State Key Laboratory of Infrared Physics, East China Normal University, Fudan University, State Key Laboratory of Surface Physics, Hong Kong University of Science and Technology
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2913750145