4.6 Article

High Optical Response of Niobium-Doped WSe2-Layered Crystals

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MATERIALS
卷 12, 期 7, 页码 -

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MDPI
DOI: 10.3390/ma12071161

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2D chalcogenides; photoconductivity; photoresponse

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  1. Ministry of Science and Technology [MOST 107-2221-E-131-032, MOST 107-2112-M-018-002]

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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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