Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33968
Title: Exceptional tunability of band energy in a compressively strained trilayer MoS2 sheet
Authors: Hui, YY
Liu, X
Jie, W
Chan, NY
Hao, J 
Hsu, YT
Li, LJ
Guo, W
Lau, SP 
Keywords: MoS2
Photoluminescence
Piezoelectric substrate
Raman spectroscopy
Strain engineering
Issue Date: 2013
Publisher: American Chemical Society
Source: ACS nano, 2013, v. 7, no. 8, p. 7126-7131 How to cite?
Journal: ACS nano 
Abstract: Tuning band energies of semiconductors through strain engineering can significantly enhance their electronic, photonic, and spintronic performances. Although low-dimensional nanostructures are relatively flexible, the reported tunability of the band gap is within 100 meV per 1% strain. It is also challenging to control strains in atomically thin semiconductors precisely and monitor the optical and phonon properties simultaneously. Here, we developed an electromechanical device that can apply biaxial compressive strain to trilayer MoS2 supported by a piezoelectric substrate and covered by a transparent graphene electrode. Photoluminescence and Raman characterizations show that the direct band gap can be blue-shifted for ∼300 meV per 1% strain. First-principles investigations confirm the blue-shift of the direct band gap and reveal a higher tunability of the indirect band gap than the direct one. The exceptionally high strain tunability of the electronic structure in MoS2 promising a wide range of applications in functional nanodevices and the developed methodology should be generally applicable for two-dimensional semiconductors.
URI: http://hdl.handle.net/10397/33968
ISSN: 1936-0851
EISSN: 1936-086X
DOI: 10.1021/nn4024834
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