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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Published inMaterials Vol. 12; no. 7; p. 1161
Main Authors Hsu, Hung-Pin, Lin, Der-Yuh, Jheng, Jhin-Jhong, Lin, Pin-Cheng, Ko, Tsung-Shine
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 10.04.2019
MDPI
Subjects
2D chalcogenides
Behavior
Crystals
Graphene
Investigations
Niobium
Optical properties
Photoconductivity
Photoelectric effect
Photoelectric emission
photoresponse
Semiconductors
Spectrum analysis
United States > US
photoconductivity
photoresponse
2D chalcogenides
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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.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma12071161