2:30 PM - 2:45 PM
[15p-A403-6] Dielectric screening effects on photoluminescence of carbon nanotubes on hexagonal boron nitride
Keywords:carbon nanotubes, hexagonal boron nitride, photoluminescence
Hexagonal boron nitride (h-BN), a two-dimensional (2D) material, is atomically flat with low defect density, which is widely used to support other 2D materials. We expect that the advantages of h-BN can also be utilized in mixed dimensional heterostructures, and single-walled carbon nanotubes (CNTs) would provide a unique opportunity in this context. The one-dimensional nature of CNTs results in enhanced Coulomb interactions, giving rise to tightly bound excitons that show photoluminescence (PL) at room temperature. CNTs directly attached on solid-state substrates such as SiO2/Si, however, suffers from the strong substrate quenching effect. By using h-BN as a substrate, the quenching effect is expected to be suppressed. Moreover, excitons in CNTs are sensitive to the dielectric environment, and intimate contact with the h-BN could result in large modifications in excitonic energies.