Control of biaxial strain in single-layer molybdenite using local thermal expansion of the substrate
By G. Plechinger, A. Castellanos-Gómez, M. Buscema, Herre S. J. van der Zant, G. Steele, A. Kuc, Thomas Heine, C. Schüller, T. Korn. 2015
191 citations recorded by the source corpus.
Single-layer MoS2 is a direct-gap semiconductor whose electronic band structure strongly depends on the strain applied to its crystal lattice. While uniaxial strain can be easily applied in a controlled way, e.g., by bending of a flexible substrate with the atomically thin MoS2 layer on top, experimental realization of biaxial strain is more challenging. Here, we exploit the large mismatch between the thermal expansion coefficients of MoS2 and a silicone-based substrate to apply a controllable biaxial tensile strain by heating the substrate with a focused laser. The effect of this biaxial strain is directly observable in optical spectroscopy as a redshift of the MoS2 photoluminescence. We also demonstrate the potential of this method to engineer more complex strain patterns by employing highly absorptive features on the substrate to achieve non-uniform heat profiles. By comparison of the observed redshift to strain-dependent band structure calculations, we estimate the biaxial strain applied by the silicone-based substrate to be up to 0.2%, corresponding to a band gap modulation of 105 meV per percentage of biaxial tensile strain.
Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/a1473856da56033dcc48204169d1996d5f09af16
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In Electronic, Optical and Magnetic Materials
In Materials Chemistry
- Francisco Guinea
- A.K. Geim
- A. Grigorenko
- N. M. R. Peres
- K. Novoselov
- V. Kravets
- Yujia Chen
- Shengxue Yang
Citations in the corpus
- Strained Bubbles in van der Waals Heterostructures as Local Emitters of Photoluminescence with Adjustable Wavelength (2019, background): “Recent theoretical and experimental studies (11-19) have shown that the physical properties of MoS2 are strongly affected by tensile or compressive strain.”
- Strain engineering of two‐dimensional materials: Methods, properties, and applications (2021, methodology): “When being locally heated using a laser, the stretching of the PDMS substrate will introduce tensile strain to MoS2, as shown in Figure 1(C), (D).(44) Then, a biaxial homogenous strain of 0.”
- Biaxial strain tuning of the optical properties of single-layer transition metal dichalcogenides (2017, unknown): “In order to apply biaxial strain to single-layer TMDCs, we changed the temperature of the substrate with a Peltier heater/ cooler and exploit the large mismatch between the thermal expansion coefficients of the substrate and the TMDC flake deposited on top, similarly to previous work by part of the ”