Recombination energy for negatively charged excitons inside type-II core/shell spherical quantum dots

作者：Chafai A; Essaoudi I; Ainane A; Dujardin F^*; Ahuja R

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2018, 101: 125-130.

DOI：10.1016/j.physe.2018.03.024

• Exciton
• Trion
• Recombination energy
• Core/shell materials
• Nanostructures
• Quantum dots

The recombination energy of isolated neutral exciton and that of isolated negatively charged exciton inside a type-II core/shell spherical quantum dot are studied. Our investigation considers the charge-carriers effective mass discontinuity at the surface contact between the core and shell materials. Although our model omits the effect of the surface polarization, the dielectric-constant mismatch at the nanodot boundaries was taken into account. In order to achieve the exciton and negative trion energies, we proceed by a variational calculation in the framework of the envelope approximation. Our results reveal a strong correlation between the nanodot morphology and the energy spectrum of the neutral and negatively charged exciton.

• 出版日期2018-7