Transition Energy in Strong and Weak Confinement of Type-I Spherical Core-shell Quantum Dots

In this paper, we present a mathematical approach in estimating transition energy of type-I core-shell quantum dots (CSQDs) in strong and weak confinement of charge carriers within the core materials. We will do this by using effective-mass approximation together with a single-band model. The effects of potential step of conduction band and valence band on confinement strength will be discussed. It can be seen at the end of this paper that for a same size CSQDs, CSQDs with bigger potential steps will have stronger carriers confinement and with more localized excitons.