High Optical Response of Niobium-Doped WSe₂-Layered Crystals.

Author(s) Hsu, H.P.; Lin, D.Y.; Jheng, J.J.; Lin, P.C.; Ko, T.S.
Journal Materials (Basel)
Date Published 2019 Apr 10
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.

DOI 10.3390/ma12071161
ISSN 1996-1944
Citation Hsu H-, Lin D-, Jheng J-, Lin P-, Ko T-. High Optical Response of Niobium-Doped WSe₂-Layered Crystals. Materials (Basel). 2019;12(7).