Anharmonic Shear Vibration of Electrostatic Layers Leads to Low Thermal Conductivity in Bi2O2Se.
Bi2O2Se is among the best n-type oxide thermoelectric materials with low lattice thermal conductivity and shows a robust ferroelectric state at room temperature in reduced dimensions. Herein, we have combined experimental and theoretical studies to comprehend this elusive congruence of low lattice thermal conductivity...