Unexplored photoluminescence from bulk and mechanically exfoliated few layers of Bi₂Te₃.

ABSTRACT: We report the exotic photoluminescence (PL) behaviour of 3D topological insulator Bi₂Te₃ single crystals grown by customized self-flux method and mechanically exfoliated few layers (18 ± 2 nm)/thin flakes obtained by standard scotch tape method from as grown Bi₂Te₃ crystals. The experimental PL studies on bulk single crystal and mechanically exfoliated few layers of Bi₂Te₃ evidenced a broad red emission in the visible region from 600-690 nm upon 375 nm excitation wavelength corresponding to optical band gap of 2 eV. These findings are in good agreement with our theoretical results obtained using the ab initio density functional theory framework. Interestingly, the observed optical band gap is several times larger than the kn

SUBMITTER: Gupta BK 

PROVIDER: S-EPMC6004008 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature