期刊
MATERIALS
卷 12, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/ma12071161
关键词
2D chalcogenides; photoconductivity; photoresponse
类别
资金
- Ministry of Science and Technology [MOST 107-2221-E-131-032, MOST 107-2112-M-018-002]
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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