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New Results Reveal Extensive Tunability of 2-D Materials
Molecular Foundry users and scientists have developed a new method to directly measure the band gap of MoS2, which is 30% higher than expected. The study also discovered how to tune optical and electronic properties in a 2-D material.
Significance and Impact
This is the first time the MoS2 band gap has been measured; the band gap is vital for properly connecting 2-D materials in a device. MoS2 is sensitive to both optical and electronic effects and will
enable creation of ultrasensitive sensors and smaller transistors.
- The researchers measured the band gap for a monolayer of molybdenum disulfide, which has proved difficult to accurately predict theoretically, and found it to be about 30 percent higher than expected from prior experiments.
- Their technique uses photoluminescence excitation (PLE) spectroscopy to measure both the exciton and band gap signals; the new method also enables the researchers to discern the differences between optical and electronic properties of the material.
- The researchers also found that the band gap was tunable by adjusting the density of the electrons in the material.
K. Yao, A., Yan, S. Kahn, A. Suslu, Y. Liang, E.S. Barnard, S. Tongay, A. Zettl, N.J. Borys, P.J. Schuck. Phys. Rev. Lett. 2017.