1. High Optical Response of Niobium-Doped WSe2-Layered Crystals
- Author
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Hung-Pin Hsu, Tsung Shine Ko, Pin Cheng Lin, Jhin Jhong Jheng, and Der-Yuh Lin
- Subjects
Materials science ,Niobium ,chemistry.chemical_element ,Photodetection ,Kinetic energy ,lcsh:Technology ,Article ,Crystal ,photoconductivity ,General Materials Science ,photoresponse ,Spectroscopy ,lcsh:Microscopy ,lcsh:QC120-168.85 ,Photocurrent ,lcsh:QH201-278.5 ,business.industry ,lcsh:T ,Photoconductivity ,Doping ,chemistry ,lcsh:TA1-2040 ,Optoelectronics ,lcsh:Descriptive and experimental mechanics ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,2D chalcogenides ,business ,lcsh:Engineering (General). Civil engineering (General) ,lcsh:TK1-9971 - Abstract
The optical properties of WSe2-layered crystals doped with 0.5% niobium (Nb) grown by the chemical vapor transport method were characterized by piezoreflectance (PzR), photoconductivity (PC) spectroscopy, frequency-dependent photocurrent, and time-resolved photoresponse. With the incorporation of 0.5% Nb, the WSe2 crystal showed slight blue shifts in the near band edge excitonic transitions and exhibited strongly enhanced photoresponsivity. Frequency-dependent photocurrent and time-resolved photoresponse were measured to explore the kinetic decay processes of carriers. Our results show the potential application of layered crystals for photodetection devices based on Nb-doped WSe2-layered crystals.
- Published
- 2019
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