Atomically thin noble metal dichalcogenide: a broadband mid-infrared semiconductor

Xuechao Yu, Peng Yu, Di Wu, Bahadur Singh, Qingsheng Zeng, Hsin Lin, Wu Zhou, Junhao Lin, Kazu Suenaga, Zheng Liu () and Qi Jie Wang ()
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Xuechao Yu: Nanyang Technological University
Peng Yu: Nanyang Technological University
Di Wu: National University of Singapore
Bahadur Singh: National University of Singapore
Qingsheng Zeng: Nanyang Technological University
Hsin Lin: National University of Singapore
Wu Zhou: University of Chinese Academy of Sciences
Junhao Lin: National Institute of Advanced Industrial Science and Technology (AIST)
Kazu Suenaga: National Institute of Advanced Industrial Science and Technology (AIST)
Zheng Liu: Nanyang Technological University
Qi Jie Wang: Nanyang Technological University

Nature Communications, 2018, vol. 9, issue 1, 1-9

Abstract: Abstract The interest in mid-infrared technologies surrounds plenty of important optoelectronic applications ranging from optical communications, biomedical imaging to night vision cameras, and so on. Although narrow bandgap semiconductors, such as Mercury Cadmium Telluride and Indium Antimonide, and quantum superlattices based on inter-subband transitions in wide bandgap semiconductors, have been employed for mid-infrared applications, it remains a daunting challenge to search for other materials that possess suitable bandgaps in this wavelength range. Here, we demonstrate experimentally for the first time that two-dimensional (2D) atomically thin PtSe2 has a variable bandgap in the mid-infrared via layer and defect engineering. Here, we show that bilayer PtSe2 combined with defects modulation possesses strong light absorption in the mid-infrared region, and we realize a mid-infrared photoconductive detector operating in a broadband mid-infrared range. Our results pave the way for atomically thin 2D noble metal dichalcogenides to be employed in high-performance mid-infrared optoelectronic devices.

Date: 2018
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DOI: 10.1038/s41467-018-03935-0

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