Fig. Electron mobility in Y 2 Te 3 calculated using Boltzmann transport theory. Electron mobility limited by polar optical phonon (red), acoustic deformation (blue), and ionized impurity (orange) scattering are shown individually. Here, we set the ionized impurity concentration to 3.5 × 10 19 cm -3 , as determined from defect formation energy calculations (see Section 2.2). We find that polar optical phonon scattering is the dominant mechanism.