Fabrication of C₁₂H₂₈ClN-assisted perovskites thin films with micrometer-sized grains via low-temperature hot-casting in ambient air for resistive memory device application

Fabricating perovskite (PVK) films with large grains and compact grain boundaries via solution processability is demanding for efficient electronic and optoelectronic devices. Hot-casting produces dense PVK films with bigger and adjacent grains; however, involves higher temperatures and an inert atmosphere that increases the fabrication cost. Herein, using dodecylammonium chloride (DCl) as an additive, combined with hot-casting is utilized and compact bi-cation PVK films with grain size > 110 µm are synthesized at lower temperature and ambient air. It is revealed that the films have a dense microstructure with no voids among the grains. Also, the films are highly crystalline with preferentially orientated crystals and showed greater hydrophobicity and an extended carrier lifetime. Finally, the films are employed in a resistive-memory storage device, which demonstrated a high ON/OFF ratio of > 10⁶ and lower power consumption. Such high-quality films prepared at ambient conditions could be useful for the realization of other highly efficient optoelectronic devices.