Abstract
We have studied the electronic structure of strained-layer ZnSe/ZnS superlattices by using two kinds of two-photon spectroscopy: two-photon absorption spectroscopy and resonant second-harmonic generation. The exciton binding energy is found to exhibit a blue shift as compared to the bulk value due to the exciton confinement effect. Based on the observed subband energies, we derive a conduction-band offset of ∼ 70 meV and a valence-band offset of ∼ 800 meV.
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