Next Generation Optical Material

Next Generation Optical Material


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Max Wolf | 07/25/2020

Next Generation Optical Material

Layered semiconductors such as transition metal dichalcogenides have great potential for optoelectronic applications, which are now relying on electronics.

Dichalcogenides of transition metals (they are also DPM) are the thinnest, two-dimensional semiconductors, where one layer of metal atoms is located between two layers of chalcogen atoms. The latter include
oxygen, sulfur, selenium, tellurium, polonium and other known elements.

DPMs are successfully used in the manufacture of solar cells, ultrasensitive photodetectors, sensors, optical modulators, light emitters and lasers. The two-dimensional structure of the PDM makes these
materials similar to graphene, but dichalcogenides are superior to two-dimensional carbon in a number of properties.

The use of PDM for the mass production of sensitive electrical appliances is complicated, among other things, due to the lack of a fast, contactless, and most importantly, reliable method of obtaining them.
dielectric function, as well as estimates of changes in optical constants and exciton binding energies.

Scientists from the Center for Photonics and Two-Dimensional Materials of MIPT, together with colleagues from Sweden, have developed a new approach based on ellipsometry measurements to restore dielectric functions and
excitonic properties of both monolayer and bulk dichalcogenides. Using the above method, Russian and Swedish specialists investigated the properties of the MoS monolayer2 and his
bulk crystal in a wide spectral range from 290 to 3300 nm. It was found that in the near and mid infrared ranges, both configurations have no optical absorption and have
extremely high dielectric constant, which makes them optimal for use in the field of photonics.

In addition, during the studies, a previously unrecorded peak in the dielectric function of the MoS monolayer was discovered2, which allows it to be used in chemical and biological
sounding.

The results of Russian-Swedish research were published in the journal 2D Materials and Applications
volume.



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