A review devoted to the theory of excitonic quasimolecules (Biexcitons) (formed of spatially separated electrons and holes) in a nanosystems that consists of semiconductor and dielectric quantum dots synthesized in a dielectric matrix. It is shown that exciton quasimolecules formation is of the threshold character and possible in nanosystems, in with the spacing between the quantum dots surfaces is larger than a certain critical spacing. It was found that the binding energy of singlet ground

more »

... te of exciton quasimolecules, consisting of two semiconductor quantum dots is a significant large values, larger than the binding energy of the biexciton in a semiconductor single crystal almost two orders of magnitude. Figure 1: Band diagram of the QD -matrix nano hetero structure. In the nano hetero structure, the QD is a potential well for a hole and a barrier for an electron. The energies E c(1) , E v(1) , E c(2) and E v(2) , correspond to the positions of the bottom of the conduction band and the top of the valence band of the matrix and QD, respectively. Volume 4 • Issue 4 • 1000188 Mod Chem appl, an open access journal