Palladium Diselenide Long-Wavelength Infrared Photodetector with High Sensitivity and Stability

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

doi:10.1021/acsnano.8b09476

Palladium Diselenide Long-Wavelength Infrared Photodetector with High Sensitivity and Stability

ACS Nano. 2019 Feb 26;13(2):2511-2519. doi: 10.1021/acsnano.8b09476. Epub 2019 Feb 6.

Authors

Mingsheng Long^{1

2}, Yang Wang¹, Peng Wang^{1

2}, Xiaohao Zhou^{1

2}, Hui Xia^{1

2}, Chen Luo³, Shenyang Huang⁴, Guowei Zhang⁴, Hugen Yan⁴, Zhiyong Fan⁵, Xing Wu³, Xiaoshuang Chen^{1

2}, Wei Lu^{1

2}, Weida Hu^{1

2}

Affiliations

¹ State Key Laboratory of Infrared Physics , Shanghai Institute of Technical Physics, Chinese Academy of Sciences , 500 Yu Tian Road , Shanghai 200083 , China.
² University of Chinese Academy of Sciences , 19 Yu Quan Road , Beijing 100049 , China.
³ Shanghai Key Laboratory of Multidimensional Information Processing, Department of Electronic Engineering , East China Normal University , 500 Dongchuan Road , Shanghai 200241 , China.
⁴ Department of Physics, State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) , Fudan University , 220 Han Dan Road , Shanghai 200433 , China.
⁵ Department of Electronic and Computer Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong China SAR.

PMID: 30714726
DOI: 10.1021/acsnano.8b09476

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 PdSe₂ 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 PdSe₂ at the forefront of long-IR two-dimensional-materials-based photonics.

Keywords: detectivity; heterostructure; long-wavelength infrared; palladium diselenide; photodetector; photoresponsivity.