Exploration of exciton behavior in atomically thin WS2 layers by ionic gating

Xin He, Zehui Zhang, Chenhui Zhang, Yang Yang, Ming Hu, Weikun Ge, Xixiang Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The photoluminescence spectra of mono- and bilayer WS2, gated by the ionic liquid, were systematically studied at 77 K. Interesting phenomena, such as a redshift of the exciton peaks and a change in the spectral weight of the exciton, trion, and biexciton peaks, were observed at intermediate doping levels. By increasing the doping level, all the exciton, trion, and biexciton peaks vanished, which is attributed to the phase-space filling effect and the Coulomb screening effect. The variation in the band structure, which was induced by the quantum-confined Stark effect in both the mono- and bilayer WS2, was also studied using first-principle calculations.

Original languageEnglish (US)
Article number013104
JournalApplied Physics Letters
Issue number1
StatePublished - Jul 2 2018

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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