Even though PbSnTe–PbTeSe superlattice has a type-I′ structure, its multiquantum well (MQW) laser has been realized by introducing band bending in the MQW active region. The MQW laser showed anomalous temperature dependence in the threshold current and the corresponding output photon energy. The lasing mechanism and anomalous behavior of the laser is qualitatively well explained by taking into account the variation of band bending due to large temperature dependence of the dielectric constants, assuming the barrier height ΔEc=−40 meV.
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Ishida et al. (1986) studied this question.
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