Refractive index database

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Optical constants of WSe2 (Tungsten diselenide)
Ermolaev et al. 2021: monolayer (1L) film; n,k 0.30–1.70 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants

Conditions & Spec sheet

n_is_absolute: true
wavelength_is_vacuum: true
film_thickness: 1L
substrate: SiO2/Si


CVD-grown monolayer.


G.A. Ermolaev, D.I. Yakubovsky, Y.V. Stebunov, A.A. Voronov, A.V. Arsenin, V.S. Volkov. Spectroscopic ellipsometry of large area monolayer WS2 and WSe2 films, AIP Conf. Proc., 2359, 020005 (2021) (Numerical data kindly provided by Dr. Georgy Ermolaev)


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Tungsten diselenide, WSe2

Tungsten diselenide (WSe2) is a member of the transition metal dichalcogenide (TMD) family, known for its distinctive layered structure. The individual layers are bound by weak van der Waals interactions, allowing for exfoliation into atomically thin sheets. In its monolayer form, WSe2 possesses a direct bandgap, distinguishing it from its bulk indirect bandgap property. This unique characteristic renders WSe2 as a prime candidate for optoelectronic applications, including photodetectors, light-emitting diodes (LEDs), and even photovoltaic devices. It has also been explored in the fabrication of field-effect transistors and quantum devices. The intriguing electronic and optical attributes of WSe2, especially when interfaced with other 2D materials, have garnered significant attention in advanced materials research.

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