In the present materials search, we chose a particular operating temperature (room temperature) to estimate zT 300K . Our choice of the particular operating temperature is motivated by the goal to search for room-temperature TE materials with applications in wearable devices and IoT sensors. 9,88 However, the true maximum zT of the material is not guaranteed to be at the chosen operating temperature, because the spread of the selection function @f /@E (Figure ) depends on the operating temperature and, as a result, determines the transport coe cients (Figures ). Accordingly, the calculated TE performance of each material reported in this study assumes the performance is optimized through doping and the operating temperature is 300 K. Moreover, there is a growing body of work suggesting polar optical scattering is the dominant mechanism in polar materials, which challenges the usual assumption of acoustic deformation potential scattering. While our analytical model also assumes deformation potential scattering, we have verified that the qualitative conclusions, including the material descriptors, remain unchanged when polar optical scattering is dominant.