Journal Article

Broadband Optical Properties of Atomically Thin PtS2 and PtSe2

Ermolaev, Georgy A., Tselin, Andrey P., Romanov, Roman I., Volkov, Valentyn S., Voronin, Kirill V., Slavich, Aleksandr S., Markeev, Andrey M., Vyshnevyy, Andrey A., Kruglov, Ivan A., Tatmyshevskiy, Mikhail K., Novikov, Sergey M., Mironov, Mikhail S., Yakubovsky, Dmitry I., Mazitov, Arslan B., Arsenin, Aleksey V.

2021

Overview

Noble transition metal dichalcogenides (TMDCs) such as PtS2 and PtSe2 show significant potential in a wide range of optoelectronic and photonic applications. Noble TMDCs, unlike standard TMDCs such as MoS2 and WS2, operate in the ultrawide spectral range from ultraviolet to mid-infrared wavelengths; however, their properties remain largely unexplored. Here, we measured the broadband (245–3300 nm) optical constants of ultrathin PtS2 and PtSe2 films to eliminate this gap and provide a foundation for optoelectronic device simulation. We discovered their broadband absorption and high refractive index both theoretically and experimentally. Based on first-principle calculations, we also predicted their giant out-of-plane optical anisotropy for monocrystals. As a practical illustration of the obtained optical properties, we demonstrated surface plasmon resonance biosensors with PtS2 or PtSe2 functional layers, which dramatically improves sensor sensitivity by 60 and 30%, respectively.

• Publisher: MDPI AG,MDPI
• Subject: Anisotropy / Approximation / Biosensors / Broadband / Chemical vapor deposition / dielectric properties / First principles / Microscopy / Molybdenum disulfide / nano-photonics / optical constants / Optical properties / Optics / Optoelectronic devices / refractive index / Refractivity / Semiconductors / Single crystals / Spectrum analysis / Surface plasmon resonance / Transition metal compounds / transition metal dichalcogenides / two-dimensional materials / Wavelengths