Optical constants of PtSe2 (Platinum diselenide)
Tharrault et al. 2025: 1L film; n,k 0.416–0.939 µm
Complex refractive index (n+ik)
Derived optical constants
Comments
1L CVT-grown exfoliated crystal. The optical indexes are computed from the 2D surface conductivity using σ2D·Z0 = −2πi·(t/λ)·(εr−1), where Z0 is the impedance of free space, i the imaginary unit, t the equivalent layered stack thickness and λ the free space wavelength. We use t = NL t0 with t0 = 5.1 Å the single layer thickness. The measurement method accuratly determines Im{εr} = 2nk, but only Re{εr} = n2 - k2 as long as the optical absorption is non-zero.
References
M. Tharrault, S. Ayari, M. Arfaoui, E. Desgué, R. Le Goff, P. Morfin, J. Palomo, M. Rosticher, S. Jaziri, B, Plaçais,P. Legagneux, F. Carosella, C. Voisin, R. Ferreira, E. Baudin. Optical absorption in indirect semiconductor to semimetal PtSe2 arises from direct transitions. Phys. Rev. Lett. 134, 066901 (2025) (Numerical data kindly provided by Marin Tharrault)
Data
Additional information
About Platinum diselenide
Platinum diselenide (PtSe2) is a member of the transition metal dichalcogenide (TMD) family, similar to materials like MoS2 and WS2. It forms layered structures that can be exfoliated into ultrathin layers or even monolayers. Unique among the TMDs, PtSe2 has garnered attention due to its interesting electronic and optical properties. For instance, it exhibits both semiconducting and metallic behaviors depending on its layer thickness. Monolayer PtSe2 possesses a direct bandgap, which is promising for applications in nanoelectronics and optoelectronics. Additionally, its high thermal stability and potential for integrating with other electronic materials make it a promising candidate for future electronic and optoelectronic devices. Ongoing research seeks to further explore its intrinsic properties and potential applications in devices such as transistors, photodetectors, and sensors.
Other names and variations:- PtSe2
- Platinum(IV) selenide
- Sudovikovite