Scattering Engineering for High Power Factor Semimetals Proved by Shubnikov‐de Haas Oscillation and Anisotropic Resistivity

The carrier dynamics of the ultra‐high power factor semimetal Ta 2 PdSe 6 are investigated using magnetotransport and anisotropic resistivity measurements. The magnetotransport analysis reveals a pronounced asymmetry in the mobilities of electrons and holes, which plays a key role in the thermoelectric performance. The effective mass and scattering time of the charge carriers are quantitatively determined through combined analyses of Shubnikov‐de Haas oscillations and anisotropic resistivity. Furthermore, it is demonstrated that chemical substitution modifies the thermoelectric properties of Ta 2 PdSe 6 primarily by altering the scattering time. These findings establish a new strategy—scattering engineering—for optimizing high power factor semimetals by controlling charge carrier lifetimes rather than solely relying on band structure engineering.