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- Su, Weitao, et al. Show all 8 Authors
- Journal of physical chemistry 2019 v.123 no.6 pp. 3900-3907
- Raman spectroscopy; energy; optical properties; photoluminescence; physical chemistry; temperature
- ... Defects play an indispensable role in tuning the optical properties of two-dimensional materials. Herein, we study the influence of defects on the photoluminescence and resonance Raman spectra of as-grown monolayer (1L) WS₂. Increasing the density of defects significantly lowers the excitonic binding energy by up to 110 meV. These defect-modified excitonic binding energies in 1L-WS₂ strongly media ...
- Su, Weitao, et al. Show all 7 Authors
- Chemical communications 2018 v.54 no.7 pp. 743-746
- chemical compounds; chemical reactions; energy; nutrient deficiencies; photoluminescence
- ... A nonstoichiometric process by modulating the W/Se atomic ratio was employed to tune the excitonic PL band of monolayer WSe₂ from 810 nm to 690 nm. DFT calculations indicate that Se-rich conditions reduce the band gap, while Se-deficient conditions facilitate the increasing band gap and decreasing excitionic binding energy, which finally induces such broadband tuning of the PL band. ...