Intrawell and interwell phonon-excitons in a CdS/CdSe/CdS asymmetric quantum well

Binding energies of intrawell and interwell excitons are studied in the CdS/CdSe/CdS asymmetric quantum well by varying right well sizes under polaronic effect. The transition energy, transition life time, oscillator strength and absorption coefficients are measured. The above properties are obtained in the influence of image charge potential included in the Hamiltonian. The optical absorption coefficients with the function of incoming photon energy are obtained. The results bring out that the peak of absorption coefficient is larger for the direct exciton than for the indirect exciton and the radiative lifetime for the indirect exciton is found to be higher.

Automated summary

The binding energies of intra- and interwell excitons in the CdS/CdSe/CdS asymmetric quantum well were studied by varying the size of the right well under the polaronic effect. Transition energy, transition lifetime, oscillator strength, and absorption coefficients were measured. The results showed that the peak absorption coefficient was larger for direct excitons compared to indirect excitons, with a longer radiative lifetime for the latter.