From the Growth to the Exploitation of 2D Materials

The pressing demand for miniaturized devices can be full filled by two-dimensional (2D) semiconducting materials. Among the 2D semiconducting materials, indium selenides are attracting great attention due to their desirable electronic and optical properties¹, which are relevant for several applications in electronics, optoelectronics, and thermoelectrics^2,3. Particularly, indium selenides belong to a complex system with different stoichiometry, including InSe, In₂Se_3, and In₄Se₃, and their different polytype phases (α, β, γ, etc.). These compounds have band gaps in the near-infrared to visible range (1.2 – 2 eV) of the electromagnetic spectrum², high electron mobility at room temperature (> 0.1 m²/Vs)¹, room temperature ferroelectricity^4,5 and a layer thickness dependent “Mexican hat” valence band energy dispersion⁶. On the other hand, the other metal chalcogenides ZnS, and CdS are becoming attractive due to their unique electronic and optical properties. ZnS is a wider-bandgap semiconductor (E_g ≈ 3.7 eV), a good candidate for UV sensors, infrared windows, photonics, lasers, and solar cells, and a good thermoelectric material⁷. Moreover, the ZnS/CdS heterostructure enhanced the photocatalyst and shows promise for future solar energy harvesting technologies⁸.

In this seminar, I will present our recent development on the 2D material growth and exploitation of the grown materials.

References

1. Bandurin, D.A., et al., Nat. Nanotechnol.. 12, 223-227, (2017).

2. Huang, W., et al., Cryst. Eng. Comm.. 18(22), 3968-84, (2016).

3. Lei, S., et al., Nat. Nanotechnol., 11(5), 465-71, (2016).

4. Hu, H., et al., Appl. Phys. Lett., 114, 252903, (2019). 

5. Zheng, C., et al., Sci. Adv., 4(7), eaar7720, (2018).

6. Debbichi, L., et al., J Phys Chem Lett, 6(15), 3098-103, (2015).

7. Es-Smairi, A., et al., Mater. Res. Express 6, 125047 (2019).

8. Wang, J., et al., RSC Adv. 7, 24864 (2017).