Revealing the Variation of Photodetectivity in MAPbI₃ and MAPb(I_0.88Br_0.12)₃ Single Crystal Based Photodetectors Under Electrical Poling-Induced Polarization

The use of electrical poling to induce polarization potential has been found increase the photocurrent (Ilight) in hybrid perovskite-based devices; however, origin this process not fully understood. Here, we study effect on photodetection properties self-powered photodetectors (PDs) based halide perovskites two different phase structures (i.e., tetragonal and cubic). Specifically, extensive investigations are performed MAPbI3 (tetragonal) MAPb(I0.88Br0.12)3 (cubic) single crystals (SCs). Our characterization results revealed that Ilight increased by 2-fold during forward decreased reverse both PDs. improved is caused induced ion migration, which builds remanent due accumulation near metal electrodes. was be greater PD as compared PD, influences interface band bending reduces Schottky barrier height (SBH). This highlights modification SBH, describes energy for electrons formed at a metal–semiconductor junction, can tune response time