Multi-Pulse Terahertz Spectroscopy: Hot Polaron Photoconductivity Dynamics in Metal-Halide Perovskites

We present multi-pulse time-resolved terahertz spectroscopy study of lead halide perovskite materials. By heating carriers with infrared pulse and observed the cooling process, the carrier cooling dynamics are measured in the context of complex photoconductivity as a function of time and frequency. The result indicates non-Dude conductivity and the is discussed in conjunction with theoretical study based on polaron conductivity.