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▲ [22p-P13-9] Investigation of charge transport properties in a Dion-Jacobson-type 2D organicinorganic perovskite
キーワード：Two-dimensional organic-inorganic hybrid perovskite, heterostructure, charge transport
Two-dimensional (2D) organic-inorganic hybrid perovskites, which incorporate functional organic cations, have emerged as a new type of semiconducting materials for photoelectronic devices such as solar cells, light-emitting diodes, and photodetectors. Type II heterostructures formed by organic ligands and inorganic layers in 2D perovskites can offer separated charge transport channels for hole and electron charge carriers. Herein, we prepared and studied a lead-based 2D perovskite structure incorporating simple terphenyl diammonium salts as organic spacers. The theoretical simulation confirmed that a type II heterostructure is well-formed in such Dion−Jacobson-type 2D perovskites. Photophysical studies demonstrated that this hybrid material presents an important photoluminescence quenching (and photoluminescence lifetime decrease) of the organic salt which is consistent with its type II heterojunction structure. Based on the type II energy level alignment, the electrons and holes should be transported separately in the perovskite structure within inorganic and organic sublayers, respectively. Thus, the charge transport properties of this 2D perovskite have been successfully investigated by the space charge limited current (SCLC) method and electron and hole mobilities based on single-crystal devices were evaluated to be 0.3 cm2 V-1 s-1 and 7.9 x 10-5 cm2 V-1 s-1, respectively. This work gives valuable insights into the charge transport mechanisms of type II heterostructures and paves the way toward optoelectronic device applications for such Dion−Jacobson-type 2D perovskites.