期刊
ADVANCED MATERIALS
卷 31, 期 19, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201900597
关键词
bandgap engineering; optomechanical 3D straining; single-layer graphene
类别
资金
- National Research Council Senior Research Associateship
- NSF [CMMI-0547636, CMMI 0928752]
- National Natural Science Foundation of China [61704061]
- Science and Engineering Research Board, Dept. of Sci. and Tech., Govt. of India [SB/S2/RJN-205/2014]
Graphene has a great potential to replace silicon in prospective semiconductor industries due to its outstanding electronic and transport properties; nonetheless, its lack of energy bandgap is a substantial limitation for practical applications. To date, straining graphene to break its lattice symmetry is perhaps the most efficient approach toward realizing bandgap tunability in graphene. However, due to the weak lattice deformation induced by uniaxial or in-plane shear strain, most strained graphene studies have yielded bandgaps <1 eV. In this work, a modulated inhomogeneous local asymmetric elastic-plastic straining is reported that utilizes GPa-level laser shocking at a high strain rate (d epsilon/dt) = 10(6)-10(7) s(-1), with excellent formability, inducing tunable bandgaps in graphene of up to 2.1 eV, as determined by scanning tunneling spectroscopy. High-resolution imaging and Raman spectroscopy reveal strain-induced modifications to the atomic and electronic structure in graphene and first-principles simulations predict the measured bandgap openings. Laser shock modulation of semimetallic graphene to a semiconducting material with controllable bandgap has the potential to benefit the electronic and optoelectronic industries.
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