Intense THz-Driven Dynamical Franz-Keldysh Effect in MAPbI₃

Perovskites have attracted great attention due to the high conversion efficiency. In this work, we introduce and analyze the properties of dynamical Franz-Keldysh Effect in MAPbI₃ by applying one strong THz electric filed with ~70 KV/cm and ~0.2 ps duration. At the THz frequencie of around 1.0 THz, we examine the properties of the near-bandgap optical MAPbI₃ and the absorption spectrum which can be perfectly described by the DC Franz-Keldysh effect (DFKE). In other words, these findings aim to prove that a strong AC and time-dependent electric field has significantly alter the light absorption spectrum at the band edge in MAPbI₃.