Alloying CdTe in GeTe promotes the band convergence and intensifies phonon scattering due to the discordant nature of Cd in GeTe. Upon optimizing carrier concentrationviaSb doping, we obtain a peakZTof 1.8 at 700 K and a high averageZTof 1.3.
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Nshimyimana et al. (2019) studied this question.