Size Effects in Single- and Few-Layer MoS₂ Nanoflakes: Impact on Raman Phonons and Photoluminescence.

ABSTRACT: The high optical absorption and emission of bidimensional MoS₂ are fundamental properties for optoelectronic and biodetection applications and the opportunity to retain these properties in high quality nano-sized flakes would bring further possibilities. Here, a large set of single-layer and few-layer (2-3 layers) MoS₂ flakes with size in the range from 10 nm to 20 μm are obtained on sapphire by vapor deposition techniques and evaluated combining the information from the Raman phonons with photoluminescence (PL) and absorption bands. The flakes have triangular shape and are found to be progressively relaxed from the tensile strain imposed by the sapphire substrate as their size is reduced. An increasing hole doping as size decreases is deduced from the blue shift of t

SUBMITTER: Cortijo-Campos S 

PROVIDER: S-EPMC9027366 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature