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Updated: Jan 26, 2026
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Published on: September 28, 2019
High Optical Response of Niobium-Doped WSe₂-Layered Crystals
Hung-Pin Hsu1, Der-Yuh Lin2, Jhin-Jhong Jheng3
1Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan. hphsu@mail.mcut.edu.tw.
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.
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