Tuning the composition of ternary Bi2Se3xTe3(1-x) nanoplates and their Raman scattering investigations

Abstract

We present the composition engineering and Raman scattering study of Bi2Se3xTe3(1-x) nanoplates that were synthesized by chemical vapor deposition method using different substrates, including fluorophlogopite mica, SiO2/Si. The characterizations revealed high crystallinity and layered-structure in the ternary Bi2Se3xTe3(1-x) products. Raman spectra of Bi2Se3xTe3(1-x) ranging from 80-200 cm-1 as a function of different Se-doping levels shows that intrinsic Raman peaks of Bi2Se3xTe3(1-x) nanoplates shift to higher frequency as the ratio of doped-Se increasing. The discontinuity of Raman peaks was found and discussed.

Anomalous Behavior of the Elastic and Optical Properties in Bi1.5Sb0.5Te1.8Se1.2 Topological Insulator Induced by Point Defects

“…The observed phonon frequencies are very close to the previously measured phonon frequencies in the Raman spectra of binary and ternary V 2 –VI 3 compounds . The two‐mode behavior of the high frequency mode ( f 4 and f 5 frequencies, whose splitting is better visible at lower temperatures) was observed earlier in the Raman spectra of the solid solutions Bi 2 (Te 1− x Se x ) 3 for values 1/3 < x < 2/3 . In our BSTS sample the Se content is just within this concentration range.…”

Site Preference of Se and Te in Bi2Se3 − xTex Thin Films

“…[41] Previous works have found the similar results that there is a discontinuity in the revolution of Raman peaks from Bi 2 Se 3 to Bi 2 Te 3 , of which the results provide useful insights in the realization of composition engineering and the understanding optical properties of Bi-Se-Te-based catalysts. [42] Here we have proposed a possible explanation to this slope change of the evolution of Raman peaks by the preferred substituting sites, which may further help to understand the precise structure of the ternary compound of Bi 2 Se 3−𝑥 Te 𝑥 .…”