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Materials, Vol. 12, Pages 1161: High Optical Response of Niobium-Doped WSe2-Layered Crystals

Research paper by Hung-Pin Hsu, Der-Yuh Lin, Jhin-Jhong Jheng, Pin-Cheng Lin, Tsung-Shine Ko

Indexed on: 12 Apr '19Published on: 10 Apr '19Published in: Materials



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.