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

Title	High Optical Response of Niobium-Doped WSe₂-Layered Crystals.
Authors	Hsu, H.P.; Lin, D.Y.; Jheng, J.J.; Lin, P.C.; Ko, T.S.
Journal	Materials (Basel)
DOI	10.3390/ma12071161
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.
Citation	Hsu, H.P.; Lin, D.Y.; Jheng, J.J.; Lin, P.C.; Ko, T.S..High Optical Response of Niobium-Doped WSe₂-Layered Crystals..

Related Elements

Niobium

41 Nb 92.906380000 Niobium

See more Niobium products. Niobium (atomic symbol: Nb, atomic number: 41) is a Block D, Group 5, Period 5 element with an atomic weight of 92.90638. Niobium Bohr Model The number of electrons in each of niobium's shells is 2, 8, 18, 12, 1 and its electron configuration is [Kr] 4d⁴ 5s¹. The niobium atom has a radius of 146 pm and a Van der Waals radius of 207 pm. Niobium was discovered by Charles Hatchett in 1801 and first isolated by Christian Wilhelm Blomstrand in 1864. In its elemental form, niobium has a gray metallic appearance. Niobium has the largest magnetic penetration depth of any element and is one of three elemental type-II superconductors ( Elemental Niobium along with vanadium and technetium). Niobium is found in the minerals pyrochlore, its main commercial source, and columbite. The word Niobium originates from Niobe, daughter of mythical Greek king Tantalus.