High Optical Response of Niobium-Doped WSe₂-Layered Crystals

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....

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Bibliographic Details
Published in:Materials 2019-04, Vol.12 (7), p.1161
Main Authors: Hsu, Hung-Pin, Lin, Der-Yuh, Jheng, Jhin-Jhong, Lin, Pin-Cheng, Ko, Tsung-Shine
Format: Article
Language:English
Subjects:
Behavior
Crystals
Graphene
Investigations
Niobium
Optical properties
Photoconductivity
Photoelectric effect
Photoelectric emission
Semiconductors
Spectrum analysis
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12071161