Hybrid Exciton in Semiconductor Nanorod Coated by an Organic Shell

We report a theoretical research on Wannier-Frenkell hybrid exciton in a semiconductor nanorod coated by an organic shell.

There are two kinds of excitons in solids: the Frenkel exciton in molecular and organic materials and the Wannier-Mott exciton in semiconductors. The two kinds of excitons have very different and complementary properties. In heterostructure combining of semiconductors and organic materials with exciton energies close to each other, the coupling between them will form a hybridization state having complimentary properties of both kinds of excitons.

Our model considers a system consisting of a semiconductor nanorod coated by a thin shell of an organic material. At the surface of the nanorod, due to a dipole-dipole interaction a hybridization exciton state will be formed. The electronic structures, the energies, wave function as well as dispersion relations of the new hybrid exciton state will be obtained, depending on the size and the parameters of the rod and the materials. We also investigate the effect of applying an external electric field on the hybrid excitons.