EXCITON BINDING-ENERGIES IN POLAR QUANTUM-WELLS WITH FINITE POTENTIALBARRIERS

A theoretical method for studying the properties of 1s and 2s excitons in polar quantum wells with finite potential barriers is presented. E xciton-optical-phonon interaction together with an image-charge effect and discontinuity of the band masses are included in the theory. Exci ton binding energies and exciton-LO-phonon interaction energies of GaA s/Ga1-xAlxAs and Zn1-xCdxSe/ZnSe quantum wells are calculated numerica lly. Our theory gives correct results throughout the entire well-width range of the finite-barrier quantum wells. The properties of the 1s a nd 2s excitons are found very different in quantum wells. The theoreti cal results of the energy difference between 1s and 2s exciton states of heavy-hole excitons in these quantum-well structures are compared w ith the experimental data directly. The property of the excitons in po lar quantum wells are discussed in the present paper. [S0163-1829(98)0 3640-6].