Abstract
Optical absorption of exciton transitions in asymmetry Zn1−xMgxO/ZnO/Zn1−yMgyO quantum wells (QWs) is investigated and the effects of size and ternary mixed crystals (TMCs) are discussed in a wider TMC region. The different exciton states and interstate transition energies are obtained by the combination of a variational method and numerical calculations. Based on the density matrix approach and our weight model, the mixed phase of wurtzite and zinc blende in Zn1−xMgxO alloys within 0.37<x<0.62 is considered to discuss the optical absorption coefficients (OACs) in the presence of built-in electric fields and the Hartree potential. The results show that the peaks of OACs appear a merged phenomenon under size modulation. The change of OACs in wurtzite–wurtzite–wurtzite QWs is more obvious than that in zinc blende–wurtzite–zinc blende ones with increase of Mg component to demonstrate the TMCs effect. Our results are better agreement with the photoluminescence spectra of exciton transitions given by experiments.
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