Exciton Binding Energy of Monolayer WS2

By Bairen Zhu, Xi Chen, X. Cui. Scientific Reports, 2014

740 citations recorded by the source corpus.

The optical properties of monolayer transition metal dichalcogenides (TMDC) feature prominent excitonic natures. Here we report an experimental approach to measuring the exciton binding energy of monolayer WS2 with linear differential transmission spectroscopy and two-photon photoluminescence excitation spectroscopy (TP-PLE). TP-PLE measurements show the exciton binding energy of 0.71 ± 0.01 eV around K valley in the Brillouin zone.

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/996756be1a07f8caf3222cb0dfbe9e1b85386c91

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In Materials Chemistry

1. Hongyi Yu
2. W. Yao
3. Xiaodong Xu
4. X. Cui
5. K. Mak
6. J. Shan
7. Di Xiao

Citations in the corpus

• Molecular-beam epitaxy of monolayer and bilayer WSe2: a scanning tunneling microscopy/spectroscopy study and deduction of exciton binding energy (2015, background): “Indeed, giant excitonic effect in ultrathin TMDs originating from enhanced Coulomb interaction between electrons and holes due to spatial confinement and reduced dielectric screening is one of the remarkable properties of the 2D systems, which are attracting extensive theoretical and experimental at”
• Wafer-scale synthesis of monolayer WS2 for high-performance flexible photodetectors by enhanced chemical vapor deposition (2018, background): “05 eV [12], and large exciton binding energies of 700–800 meV [13, 14].”
• Valley excitons in two-dimensional semiconductors (2015, background): “5 cm2 s ⁄ has been estimated for MoSe2 [66], WS2 [21] and WSe2 [62], which gives an exciton-exciton annihilation lifetime of 2 − 5 ps for a density ~1012 cm−2.”