Calculation of the cross-plane thermal conductivity of a quantum cascade laser active region
Szymański, M; Szymański, M; Institute of Electron Technology, al. Lotników 32/46,02-668 Warsaw, Poland
Журнал:
Journal of Physics D: Applied Physics
Дата:
2011-03-02
Аннотация:
The key problem in thermal modelling of a quantum cascade laser (QCL) is determining the thermal conductivity λ of its active region. The parameter is highly anisotropic. In particular, the cross-plane value λ<sub>⊥</sub> is significantly reduced, which may be attributed to the presence of a large number of interfaces between epitaxial layers. In this work, two relatively simple models of phonon scattering at solid–solid boundary are used to calculate λ<sub>⊥</sub> for the terahertz QCL. The theoretical results are in good agreement with measurements.
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