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Open access
npj 2D Materials and Applications, том 6, издание 1, номер публикации: 85

High-refractive index and mechanically cleavable non-van der Waals InGaS3

Toksumakov Adilet N.
Ermolaev Georgy A.
Slavich Aleksandr S.
Doroshina Natalia V.
Sukhanova Ekaterina V.
Yakubovsky Dmitry I.
Syuy Alexander V.
Romanov Roman I.
Markeev Andrey M.
Vyshnevyy Andrey A.
Arsenin Aleksey V.
Ghazaryan Davit A.
Тип документаJournal Article
Дата публикации2022-11-24
ИздательSpringer Nature
Название журналаnpj 2D Materials and Applications
Квартиль по SCImagoQ1
Квартиль по Web of ScienceQ1
Импакт-фактор 202110.52
ISSN23977132
Краткое описание

The growing family of two-dimensional crystals has been recognized as a promising platform for investigation of rich low-dimension physics and production of a variety of devices. Of particular interest are recently reported atomic sheets of non-van der Waals materials, which reshape our understanding of chemical bonds and enable heterostructures with novel functionality. Here, we study the structural and optical properties of ultrathin non-van der Waals InGaS3 sheets produced by standard mechanical cleavage. Our ab initio calculations reveal weak out-of-plane covalent bonds, responsible for the layered structure of the material. The energy required for isolation of a single layer is as low as ~50 meVÅ–2, which is comparable with the conventional van der Waals material’s monolayer isolation energies of 20–60 meVÅ–2. A comprehensive study of the structural, vibrational, and optical properties of the material reveals its wide bandgap (2.73 eV), high refractive index (>2.5) and negligible losses in the visible and infrared spectral ranges. These properties make it a perfect candidate for visible-range all-dielectric nanophotonics.

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