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Phase transition in thermoelectric (TE) material is a double‐edged sword—it is undesired for device operation in applications, but the fluctuations near an electronic instability are favorable. Here, Sb doping is used to elicit a spontaneous composition fluctuation showing uphill diffusion in GeTe that is otherwise suspended by diffusionless athermal cubic‐to‐rhombohedral phase transition at around...
In article number 2005612, Pai‐Chun Wei, Hsin‐Jay Wu, and co‐workers leverage the interplay between the spinodal decomposition and athermal phase transition in GeTe‐based thermoelectric materials. The exquisite microstructure, featured by strong composition fluctuations and the coexistence of rhombohedral‐ and cubic‐GeTe, yield high zT values of >2.6. This work provides a new thermodynamic route...
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