1. High Optical Response of Niobium-Doped WSe2-Layered Crystals.
- Author
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Hsu, Hung-Pin, Lin, Der-Yuh, Jheng, Jhin-Jhong, Lin, Pin-Cheng, and Ko, Tsung-Shine
- Subjects
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TUNGSTEN selenide , *OPTICAL properties of metals , *CHEMICAL vapor deposition , *PHOTOCONDUCTIVITY , *NIOBIUM , *DOPED semiconductors - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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