Investigation of Charge Transport Properties in a 2D Dion-Jacobson Halide Perovskite Based on Terphenyl Dications

Type II heterostructures formed by organic semiconductingligandsand inorganic layers in two-dimensional (2D) hybrid perovskitescan offer separated charge transport channels for holes and electrons.In this work, we studied a new lead-based 2D Dion-Jacobsonperovskite structure incorporating simple terphenyl diammonium saltsas organic spacers. The investigations of the electronic and photophysicalproperties, combined with theoretical calculations, indicate thatthis 2D perovskite structure forms a type II heterostructureproducing intercalated separate pathways for electrons and holes thatcan migrate within the inorganic and organic sublayers, respectively.The charge transport properties of this unusual type II 2D perovskite heterostructure have also been successfully investigatedfor the first time by the space charge limited current (SCLC) method,and maximum electron and hole mobilities based on single-crystal deviceswere evaluated to be 0.3 cm(2) V-1 s(-1) and 7.0 x 10(-4) cm(2) V-1 s(-1), respectively. Thiswork gives valuable insights into the charge transport mechanismsof type II heterostructures and paves the way toward optoelectronicdevice applications for such Dion-Jacobson-type 2D perovskites.