Effect of Exciton-Longitudinal Optical Phonon Interaction on Exciton Binding Energies in Cd_xZn_1-xS/ZnS Single Quantum Wells

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We study the effect of the exciton-longitudinal optical (LO) phonon interaction on the exciton binding energies in Cd_xZn_1-xS/ZnS single quantum wells (SQWs) for the Cd alloy content (x) range 0.1—0.3. The heavy- and light-hole exciton binding energies increase with the exciton-LO phonon interaction. The increase in the maximum heavy-hole (light-hole) exciton binding energy for x = 0.3 is 9.1 meV (4.9 meV). In narrow Cd_xZn_1-xS/ZnS SQWs, the heavy-hole exciton binding energy calculated by taking into account the exciton-LO phonon interaction for values of x in the range 0.1—0.3 exceed the LO phonon energy of Cd_xZn_1-xS. [DOI: 10.1380/ejssnt.2010.340]